During pregnancy, women are counseled to refrain from consuming certain types of foods, beverages and medications in order to avoid jeopardizing the health and development of the fetus. In fact, the American Pregnancy Association has a list of a dozen items they recommend expectant mothers omit from their diets. However, there are some additions, such as folic acid, that, when taken before and/or during pregnancy, can actually reduce the risk of birth defects and other disorders.
Research presented today at the Era of Hope conference, a scientific meeting hosted by the Department of Defense Breast Cancer Research Program (BCRP), reveals findings suggesting that if an expectant mother increases her consumption of foods high in certain fatty acids or nutrients during her pregnancy, she can potentially reduce the risk of breast cancer in her female offspring.
The research delves into breast cancer risk reductions attributed to the fetus when the mother, while pregnant, increases omega 3 fatty acids within her diet or consumes dietary methyl nutrients (methionine, choline, folate and vitamin B12). Some findings hypothesize that these diet augmentations may even prevent breast cancer from ever developing in the offspring.
"This is exciting and intriguing research," said Captain Melissa Kaime, M.D., Director of the Congressionally Directed Medical Research Programs (CDMRP), under which the BCRP is managed. "To be able to reduce the risk and possibly prevent this devastating disease before birth is an incredible notion; the BCRP is proud to support research with such potential."
Maternal Consumption of Omega 3 Fatty Acids to Reduce Breast Cancer Risk in Offspring
Principal Investigator: Philippe T. Georgel, PhD, Marshall University
Maternal dietary alterations, including increasing the consumption of omega 3 fatty acids, may reduce the risk of breast cancer to the fetus by causing epigenetic changes in utero and later through nursing. These changes may alter gene expression permanently, a change referred to as imprinting. Researchers at Marshall University conducted a study to investigate whether having a diet rich in omega 3s while pregnant would result in changes to fetal mammary gland gene expression, thereby reducing the chance that female offspring would later develop breast cancer.
In this study, there was a reduced incidence of mammary gland cancer observed for the offspring of mice that, while pregnant and nursing, consumed a diet containing canola oil, rich in omega 3, compared with the offspring of mice that, while pregnant and nursing, consumed a diet containing corn oil rich in omega 6 fatty acids. Reviewing the gene expression profiles of both groups showed that many genes related to cancer development differed between the two groups. Significant differences in the patterns of two important epigenetic markers were also observed.
"Pregnant women should be mindful of what they consume since their diet may incite epigenetic changes that could impact the development of their offspring, not just in utero but also for time to come," said Dr. Philippe Georgel, Marshall University. "Additional research continues, as we seek to elucidate the effect of diet on breast cancer-specific gene expression."
In Utero Exposure to Dietary Methyl Nutrients and Breast Cancer Risk in Offspring
Principal Investigator: Chung S. Park PhD, North Dakota State University
Links are being drawn to complete mammary gland development of the mother during pregnancy and reduction in breast cancer risk in her daughters. Supplementing the mother's diet with lipotropic nutrients (methionine, choline, folate and vitamin B12) is thought to increase methyl metabolism which stimulates the full development of the mammary gland, thereby inducing an epigenetic imprint in the mammary gland of the fetus and decreasing its breast cancer risk. Investigators at North Dakota State University are researching this link with the overall objective of determining the extent to which supplementing diets with methyl nutrients during pregnancy reduces the offspring's overall breast cancer susceptibility.
The study looked at 45 pregnant rats and randomized them into two groups: one to receive a control and the other to be fed a methyl-supplemented diet. Once the pups were born, they were separated into three additional groups depending on the feeding regime of their mother. When the female pups reached a specific age, they were exposed to a chemical that induced breast cancer and researchers charted when the first tumor appeared and measured all tumor sizes and volumes. Results demonstrated that the offspring from the methyl-supplemented diet group showed a decrease in tumor incidence and growth when compared to the control group. Also, they had fewer tumors and fewer tumors that multiplied.
"The conclusions of this study suggest that we may be able to prevent the development of breast cancer in daughters of women at risk for breast cancer by supplementing the mother's diet during pregnancy," said Dr. Chung Park, North Dakota State University. "We look forward to exploring this study further to strengthen the implications of these initial findings."
Wednesday, August 3, 2011
Gum Disease Can Increase the Time It Takes to Become Pregnant
Professor Roger Hart told the annual meeting of the European Society of Human Reproduction and Embryology that the negative effect of gum disease on conception was of the same order of magnitude as the effect of obesity.
Periodontal (gum) disease is a chronic, infectious and inflammatory disease of the gums and supporting tissues. It is caused by the normal bacteria that exist in everyone's mouths, which, if unchecked, can create inflammation around the tooth; the gum starts to pull away from the tooth, creating spaces (periodontal pockets) that become infected. The inflammation sets off a cascade of tissue-destructive events that can pass into the circulation. As a result, periodontal disease has been associated with heart disease, type 2 diabetes, respiratory and kidney disease, and problems in pregnancy such as miscarriage and premature birth. Around 10% of the population is believed to have severe periodontal disease. Regular brushing and flossing of teeth is the best way of preventing it.
Prof Hart, who is Professor of Reproductive Medicine at the University of Western Australia (Perth, Australia) and Medical Director of Fertility Specialists of Western Australia, said: "Until now, there have been no published studies that investigate whether gum disease can affect a woman's chance of conceiving, so this is the first report to suggest that gum disease might be one of several factors that could be modified to improve the chances of a pregnancy."
The researchers followed a group 3737 pregnant women, who were taking part in a Western Australian study called the SMILE study, and they analysed information on pregnancy planning and pregnancy outcomes for 3416 of them.
They found that women with gum disease took an average of just over seven months to become pregnant -- two months longer than the average of five months that it took women without gum disease to conceive.
In addition, non-Caucasian women with gum disease were more likely to take over a year to become pregnant compared to those without gum disease: their increased risk of later conception was 13.9% compared to 6.2% for women without gum disease. Caucasian women with gum disease also tended to take longer to conceive than those who were disease-free but the difference was not statistically significant (8.6% of Caucasian women with gum disease took over one year to conceive and 6.2% of women with gum disease).
Information on time to conception was available for 1,956 women, and of, these, 146 women took longer than 12 months to conceive -- an indicator of impaired fertility. They were more likely to be older, non-Caucasian, to smoke and to have a body mass index over 25 kg/m2. Out of the 3416 women, 1014 (26%) had periodontal disease.
Prof Hart said: "Our data suggest that the presence of periodontal disease is a modifiable risk factor, which can increase a woman's time to conception, particularly for non-Caucasians. It exerts a negative influence on fertility that is of the same order of magnitude as obesity. This study also confirms other, known negative influences upon time to conception for a woman; these include being over 35 years of age, being overweight or obese, and being a smoker. There was no correlation between the time it took to become pregnant and the socio-economic status of the woman.
"All women about to plan for a family should be encouraged to see their general practitioner to ensure that they are as healthy as possible before trying to conceive and so that they can be given appropriate lifestyle advice with respect to weight loss, diet and assistance with stopping smoking and drinking, plus the commencement of folic acid supplements. Additionally, it now appears that all women should also be encouraged to see their dentist to have any gum disease treated before trying to conceive. It is easily treated, usually involving no more than four dental visits.
"The SMILE study was one of the three largest randomised controlled trials performed in Western Australia. It showed conclusively that although treatment of periodontal disease does not prevent pre-term birth in any ethnic group, the treatment itself does not have any harmful effect on the mother or fetus during pregnancy."
Prof Hart said that the reason why pregnancies in non-Caucasian women were more affected by gum disease could be because these women appeared to have a higher level of inflammatory response to the condition.
Periodontal (gum) disease is a chronic, infectious and inflammatory disease of the gums and supporting tissues. It is caused by the normal bacteria that exist in everyone's mouths, which, if unchecked, can create inflammation around the tooth; the gum starts to pull away from the tooth, creating spaces (periodontal pockets) that become infected. The inflammation sets off a cascade of tissue-destructive events that can pass into the circulation. As a result, periodontal disease has been associated with heart disease, type 2 diabetes, respiratory and kidney disease, and problems in pregnancy such as miscarriage and premature birth. Around 10% of the population is believed to have severe periodontal disease. Regular brushing and flossing of teeth is the best way of preventing it.
Prof Hart, who is Professor of Reproductive Medicine at the University of Western Australia (Perth, Australia) and Medical Director of Fertility Specialists of Western Australia, said: "Until now, there have been no published studies that investigate whether gum disease can affect a woman's chance of conceiving, so this is the first report to suggest that gum disease might be one of several factors that could be modified to improve the chances of a pregnancy."
The researchers followed a group 3737 pregnant women, who were taking part in a Western Australian study called the SMILE study, and they analysed information on pregnancy planning and pregnancy outcomes for 3416 of them.
They found that women with gum disease took an average of just over seven months to become pregnant -- two months longer than the average of five months that it took women without gum disease to conceive.
In addition, non-Caucasian women with gum disease were more likely to take over a year to become pregnant compared to those without gum disease: their increased risk of later conception was 13.9% compared to 6.2% for women without gum disease. Caucasian women with gum disease also tended to take longer to conceive than those who were disease-free but the difference was not statistically significant (8.6% of Caucasian women with gum disease took over one year to conceive and 6.2% of women with gum disease).
Information on time to conception was available for 1,956 women, and of, these, 146 women took longer than 12 months to conceive -- an indicator of impaired fertility. They were more likely to be older, non-Caucasian, to smoke and to have a body mass index over 25 kg/m2. Out of the 3416 women, 1014 (26%) had periodontal disease.
Prof Hart said: "Our data suggest that the presence of periodontal disease is a modifiable risk factor, which can increase a woman's time to conception, particularly for non-Caucasians. It exerts a negative influence on fertility that is of the same order of magnitude as obesity. This study also confirms other, known negative influences upon time to conception for a woman; these include being over 35 years of age, being overweight or obese, and being a smoker. There was no correlation between the time it took to become pregnant and the socio-economic status of the woman.
"All women about to plan for a family should be encouraged to see their general practitioner to ensure that they are as healthy as possible before trying to conceive and so that they can be given appropriate lifestyle advice with respect to weight loss, diet and assistance with stopping smoking and drinking, plus the commencement of folic acid supplements. Additionally, it now appears that all women should also be encouraged to see their dentist to have any gum disease treated before trying to conceive. It is easily treated, usually involving no more than four dental visits.
"The SMILE study was one of the three largest randomised controlled trials performed in Western Australia. It showed conclusively that although treatment of periodontal disease does not prevent pre-term birth in any ethnic group, the treatment itself does not have any harmful effect on the mother or fetus during pregnancy."
Prof Hart said that the reason why pregnancies in non-Caucasian women were more affected by gum disease could be because these women appeared to have a higher level of inflammatory response to the condition.
Monday, August 1, 2011
Study shows protective benefits of DHA taken during pregnancy
An Emory University study published online today in Pediatrics suggests consuming Omega 3 fatty acids during pregnancy helps protects babies against illness during early infancy.
The randomized, placebo-controlled trial followed approximately 1,100 pregnant women and 900 infants in Mexico. The women were supplemented daily with 400 mg of Docosahexaenoic Acid (DHA) supplements in the algal form or placebo from 18 to 22 weeks gestation through childbirth.
Researchers found those whose mothers took DHA supplements had fewer colds and shorter illnesses at one, three and six months of age.
"This is a large scale, robust study that underscores the importance of good nutrition during pregnancy," says Usha Ramakrishnan, PhD, associate professor, Hubert Department of Global Health at Emory's Rollins School of Public Health. "Our findings indicate that pregnant women taking 400 mg of DHA are more likely to deliver healthier infants."
At one month of age, the infants in the DHA group experienced a reduced occurrence of cold symptoms by 25 percent, including a shorter duration of cough, phlegm and wheezing.
At age three months, the infants in the DHA group spent 14 percent less time ill.
At six months of age, infants in the DHA group experienced shorter duration of fever, nasal secretion, difficulty breathing and rash, though longer duration of vomiting. Ramakrishnan and her colleagues have previously reported findings that show offspring of women pregnant with their first child who received 400 mg DHA during pregnancy delivered babies who were 100 grams heavier at birth and 3/4 cm longer at 18 months of age.
The study, funded by the NIH and the March of Dimes Foundation, also found increased DHA levels in breast milk. All of the infants participating in the study were breastfed.
The randomized, placebo-controlled trial followed approximately 1,100 pregnant women and 900 infants in Mexico. The women were supplemented daily with 400 mg of Docosahexaenoic Acid (DHA) supplements in the algal form or placebo from 18 to 22 weeks gestation through childbirth.
Researchers found those whose mothers took DHA supplements had fewer colds and shorter illnesses at one, three and six months of age.
"This is a large scale, robust study that underscores the importance of good nutrition during pregnancy," says Usha Ramakrishnan, PhD, associate professor, Hubert Department of Global Health at Emory's Rollins School of Public Health. "Our findings indicate that pregnant women taking 400 mg of DHA are more likely to deliver healthier infants."
At one month of age, the infants in the DHA group experienced a reduced occurrence of cold symptoms by 25 percent, including a shorter duration of cough, phlegm and wheezing.
At age three months, the infants in the DHA group spent 14 percent less time ill.
At six months of age, infants in the DHA group experienced shorter duration of fever, nasal secretion, difficulty breathing and rash, though longer duration of vomiting. Ramakrishnan and her colleagues have previously reported findings that show offspring of women pregnant with their first child who received 400 mg DHA during pregnancy delivered babies who were 100 grams heavier at birth and 3/4 cm longer at 18 months of age.
The study, funded by the NIH and the March of Dimes Foundation, also found increased DHA levels in breast milk. All of the infants participating in the study were breastfed.
Wednesday, July 20, 2011
Caffeine consumption linked to female infertility
Ω
Caffeine reduces muscle activity in the Fallopian tubes that carry eggs from a woman's ovaries to her womb. "Our experiments were conducted in mice, but this finding goes a long way towards explaining why drinking caffeinated drinks can reduce a woman's chance of becoming pregnant," says Sean Ward, professor of physiology and cell biology, at the University of Nevada School of Medicine, who conducted the study.
Ward's study was recently published in the British Journal of Pharmacology.
Human eggs are microscopically small, but need to travel to a woman's womb if she is going to have a successful pregnancy. Although the process is essential for a successful pregnancy, scientists know little about how eggs move through the muscular Fallopian tubes. It was generally assumed that tiny hair-like projections, called cilia, in the lining of the tubes, waft eggs along assisted by muscle contractions in the tube walls.
By studying tubes from mice, Ward and his team discovered that caffeine stops the actions of specialized pacemaker cells in the wall of the tubes. These cells coordinate tube contractions so that when they are inhibited, eggs can't move down the tubes. In fact these muscle contractions play a bigger role than the beating cilia in moving the egg towards the womb.
"This provides an intriguing explanation as to why women with high caffeine consumption often take longer to conceive than women who do not consume caffeine," said Ward.
Discovering the link between caffeine consumption and reduced fertility has benefits.
"As well as potentially helping women who are finding it difficult to get pregnant, a better understanding of the way Fallopian tubes work will help doctors treat pelvic inflammation and sexually-transmitted disease more successfully," said Ward.
It could also increase our understanding of what causes ectopic pregnancy, an extremely painful and potentially life-threatening situation in which embryos get stuck and start developing inside a woman's Fallopian tube.
Caffeine reduces muscle activity in the Fallopian tubes that carry eggs from a woman's ovaries to her womb. "Our experiments were conducted in mice, but this finding goes a long way towards explaining why drinking caffeinated drinks can reduce a woman's chance of becoming pregnant," says Sean Ward, professor of physiology and cell biology, at the University of Nevada School of Medicine, who conducted the study.
Ward's study was recently published in the British Journal of Pharmacology.
Human eggs are microscopically small, but need to travel to a woman's womb if she is going to have a successful pregnancy. Although the process is essential for a successful pregnancy, scientists know little about how eggs move through the muscular Fallopian tubes. It was generally assumed that tiny hair-like projections, called cilia, in the lining of the tubes, waft eggs along assisted by muscle contractions in the tube walls.
By studying tubes from mice, Ward and his team discovered that caffeine stops the actions of specialized pacemaker cells in the wall of the tubes. These cells coordinate tube contractions so that when they are inhibited, eggs can't move down the tubes. In fact these muscle contractions play a bigger role than the beating cilia in moving the egg towards the womb.
"This provides an intriguing explanation as to why women with high caffeine consumption often take longer to conceive than women who do not consume caffeine," said Ward.
Discovering the link between caffeine consumption and reduced fertility has benefits.
"As well as potentially helping women who are finding it difficult to get pregnant, a better understanding of the way Fallopian tubes work will help doctors treat pelvic inflammation and sexually-transmitted disease more successfully," said Ward.
It could also increase our understanding of what causes ectopic pregnancy, an extremely painful and potentially life-threatening situation in which embryos get stuck and start developing inside a woman's Fallopian tube.
Tuesday, July 12, 2011
Smoking causes serious birth defects
To dispel any uncertainty about the serious harm caused by smoking to babies and pregnant women, the first-ever comprehensive systematic review of all studies over the past 50 years has established clearly that maternal smoking causes a range of serious birth defects including heart defects, missing/deformed limbs, clubfoot, gastrointestinal disorders, and facial disorders (for example, of the eyes and cleft lip/palate).
Smoking during pregnancy is also a risk factor for premature birth, says Dr. Michael Katz, senior Vice President for Research and Global Programs of the March of Dimes. He says the March of Dimes urges all women planning a pregnancy or who are pregnant to quit smoking now to reduce their chance of having a baby born prematurely or with a serious birth defect. Babies who survive being born prematurely and at low birthweight are at risk of other serious health problems, Dr. Katz notes, including lifelong disabilities such as cerebral palsy, intellectual disabilities and learning problems. Smoking also can make it harder to get pregnant, and increases the risk of stillbirth.
About 20 percent of women in the United States reported smoking in 2009. Around the world, about 250 million women use tobacco every day and this number is increasing rapidly, according to data presented at the 2009 14th World Conference on Tobacco or Health in Mumbai.
The new study, "Maternal smoking in pregnancy and birth defects: a systematic review based on 173,687 malformed cases and 11.7 million controls," by a team led by Allan Hackshaw, Cancer Research UK & UCL Cancer Trials Centre, University College London, will be published online today in Human Reproduction Update from the European Society of Human Reproduction and Embryology.
When women smoke during pregnancy, the unborn baby is exposed to dangerous chemicals like nicotine, carbon monoxide and tar, Dr. Katz says. These chemicals can deprive the baby of oxygen needed for healthy growth and development.
During pregnancy, smoking can cause problems for a woman's own health, including:
ectopic pregnancy;
vaginal bleeding;
placental abruption, in which the placenta peels away, partially or almost completely, from the uterine wall before delivery;
placenta previa, a low-lying placenta that covers part or all of the opening of the uterus.
Smoking is also known to cause cancer, heart disease, stroke, gum disease and eye diseases that can lead to blindness.
Smoking during pregnancy is also a risk factor for premature birth, says Dr. Michael Katz, senior Vice President for Research and Global Programs of the March of Dimes. He says the March of Dimes urges all women planning a pregnancy or who are pregnant to quit smoking now to reduce their chance of having a baby born prematurely or with a serious birth defect. Babies who survive being born prematurely and at low birthweight are at risk of other serious health problems, Dr. Katz notes, including lifelong disabilities such as cerebral palsy, intellectual disabilities and learning problems. Smoking also can make it harder to get pregnant, and increases the risk of stillbirth.
About 20 percent of women in the United States reported smoking in 2009. Around the world, about 250 million women use tobacco every day and this number is increasing rapidly, according to data presented at the 2009 14th World Conference on Tobacco or Health in Mumbai.
The new study, "Maternal smoking in pregnancy and birth defects: a systematic review based on 173,687 malformed cases and 11.7 million controls," by a team led by Allan Hackshaw, Cancer Research UK & UCL Cancer Trials Centre, University College London, will be published online today in Human Reproduction Update from the European Society of Human Reproduction and Embryology.
When women smoke during pregnancy, the unborn baby is exposed to dangerous chemicals like nicotine, carbon monoxide and tar, Dr. Katz says. These chemicals can deprive the baby of oxygen needed for healthy growth and development.
During pregnancy, smoking can cause problems for a woman's own health, including:
ectopic pregnancy;
vaginal bleeding;
placental abruption, in which the placenta peels away, partially or almost completely, from the uterine wall before delivery;
placenta previa, a low-lying placenta that covers part or all of the opening of the uterus.
Smoking is also known to cause cancer, heart disease, stroke, gum disease and eye diseases that can lead to blindness.
Wednesday, July 6, 2011
Undernourishment in Pregnant, Lactating Females = Vulnerability to type 2 diabetes
A new study published by the American Physiological Society offers the strongest evidence yet that vulnerability to type 2 diabetes can begin in the womb, giving new insight into the mechanisms that underlie a potentially devastating disease at the center of a worldwide epidemic. The study, conducted in baboon primates, finds that when mothers are even moderately undernourished while pregnant and breastfeeding, their offspring are consistently found to be prediabetic before adolescence. It is the first time that diabetes has been shown to have prenatal origins in a primate model.
According to Peter W. Nathanielsz, senior author of the study, "We pass more biological milestones before we are born and in the early weeks of life than at any other time." Poor maternal nutrition, which translates to less sustenance for growing fetuses, is a stubborn problem in parts of the U.S. and the developing world, Nathanielsz said. Thus, "Poor nutrition at critical periods of development can hinder growth of essential organs such as the pancreas, which sees a significantly decrease in its ability to secrete insulin. Our study is the first to show in a primate that poor nutrition during fetal and early life can damage the pancreas and predispose one to type 2 diabetes."
The study, "Emergence of insulin resistance in juvenile baboon offspring of mothers exposed to moderate maternal nutrient reduction" was conducted by Nathanielsz and colleagues Jaehyek Choi, Cun Li, and Thomas J. McDonald of the School of Medicine at the University of Texas Health Science Center at San Antonio, and Anthony Comuzzie and Vicki Mattern of the Texas Biomedical Research Institute in San Antonio. The study was funded by the National Institute of Diabetes and Digestive and Kidney Diseases. It is published in the online edition of the American Journal of Physiology -- Regulatory, Integrative and Comparative Physiology.
Background
Type 2 diabetes occurs when the body develops resistance to insulin, a hormone that regulates blood sugar. Although the body may initially compensate by secreting more insulin, eventually the pancreas cannot produce enough of the hormone to keep blood sugar from rising. In poorly controlled diabetes, elevated blood sugar severely damages the heart, blood vessels, eyes, kidneys and nerves. The consequences can be fatal and include heart disease, stroke, amputations, blindness and kidney failure.
Worldwide, diabetes is an escalating public health crisis. According to estimates from the World Health Organization (WHO), 366 million people will be diabetic by the 2030, up from 171 million in 2000. This is a 114 percent projected increase.
Formerly called "adult-onset diabetes," type 2 diabetes is seen increasingly in children at earlier and earlier ages. Excess body weight and physical inactivity are known causes, but Nathanielsz and his collaborators have long been interested in whether some individuals might be predisposed to diabetes from birth, or even earlier. Nathanielsz conducts research on this and similar topics through the Center for Pregnancy and Newborn Research in the UT Health Science Center's Department of Obstetrics and Gynecology.
The Study
For this study, to avoid the complication of influences from genes, researchers selected 18 female baboons similar in age and other observable characteristics and housed them with a fertile male baboon. All females became pregnant. From 30 days of gestation, 12 females were randomly assigned to be fed an appropriate diet for their weight. The other six received 70 percent of the chow given to control females on a weight-adjusted basis. The female baboons continued on their respective diets through delivery and the weaning of their offspring. Once the young baboons were weaned, they were fed normal diets.
Just before they reached puberty, the six young baboons from nutritionally restricted mothers showed increases in fasting glucose, fasting insulin and other hallmarks of prediabetes. The 12 young baboons whose mothers received adequate nutrition displayed none of these traits.
The central importance of this observation is that the mothers' food intake was only moderately restricted -- similar to the decrease faced in the United State by many people living with food insecurity. There are 925 million undernourished people worldwide, including 19 million in developed countries, according to the Food and Agriculture Organization of the United Nations.
The researchers conclude that even moderate nutrient deficiencies during pregnancy result in offspring predisposed to type 2 diabetes, particularly if they are exposed to other risk factors in later life, such as a Western diet and physical inactivity leading to obesity. A fetus may also receive fewer nutrients due to teenage pregnancy, where the growing mother competes with her offspring for resources; in pregnancies complicated by maternal vascular disease, which may occur in women who become pregnant later in their reproductive life; and when placental problems exist. The decrease in fetal growth observed in the newborn baboons was only about 10 percent, very similar to many human babies born growth restricted.
According to Peter W. Nathanielsz, senior author of the study, "We pass more biological milestones before we are born and in the early weeks of life than at any other time." Poor maternal nutrition, which translates to less sustenance for growing fetuses, is a stubborn problem in parts of the U.S. and the developing world, Nathanielsz said. Thus, "Poor nutrition at critical periods of development can hinder growth of essential organs such as the pancreas, which sees a significantly decrease in its ability to secrete insulin. Our study is the first to show in a primate that poor nutrition during fetal and early life can damage the pancreas and predispose one to type 2 diabetes."
The study, "Emergence of insulin resistance in juvenile baboon offspring of mothers exposed to moderate maternal nutrient reduction" was conducted by Nathanielsz and colleagues Jaehyek Choi, Cun Li, and Thomas J. McDonald of the School of Medicine at the University of Texas Health Science Center at San Antonio, and Anthony Comuzzie and Vicki Mattern of the Texas Biomedical Research Institute in San Antonio. The study was funded by the National Institute of Diabetes and Digestive and Kidney Diseases. It is published in the online edition of the American Journal of Physiology -- Regulatory, Integrative and Comparative Physiology.
Background
Type 2 diabetes occurs when the body develops resistance to insulin, a hormone that regulates blood sugar. Although the body may initially compensate by secreting more insulin, eventually the pancreas cannot produce enough of the hormone to keep blood sugar from rising. In poorly controlled diabetes, elevated blood sugar severely damages the heart, blood vessels, eyes, kidneys and nerves. The consequences can be fatal and include heart disease, stroke, amputations, blindness and kidney failure.
Worldwide, diabetes is an escalating public health crisis. According to estimates from the World Health Organization (WHO), 366 million people will be diabetic by the 2030, up from 171 million in 2000. This is a 114 percent projected increase.
Formerly called "adult-onset diabetes," type 2 diabetes is seen increasingly in children at earlier and earlier ages. Excess body weight and physical inactivity are known causes, but Nathanielsz and his collaborators have long been interested in whether some individuals might be predisposed to diabetes from birth, or even earlier. Nathanielsz conducts research on this and similar topics through the Center for Pregnancy and Newborn Research in the UT Health Science Center's Department of Obstetrics and Gynecology.
The Study
For this study, to avoid the complication of influences from genes, researchers selected 18 female baboons similar in age and other observable characteristics and housed them with a fertile male baboon. All females became pregnant. From 30 days of gestation, 12 females were randomly assigned to be fed an appropriate diet for their weight. The other six received 70 percent of the chow given to control females on a weight-adjusted basis. The female baboons continued on their respective diets through delivery and the weaning of their offspring. Once the young baboons were weaned, they were fed normal diets.
Just before they reached puberty, the six young baboons from nutritionally restricted mothers showed increases in fasting glucose, fasting insulin and other hallmarks of prediabetes. The 12 young baboons whose mothers received adequate nutrition displayed none of these traits.
The central importance of this observation is that the mothers' food intake was only moderately restricted -- similar to the decrease faced in the United State by many people living with food insecurity. There are 925 million undernourished people worldwide, including 19 million in developed countries, according to the Food and Agriculture Organization of the United Nations.
The researchers conclude that even moderate nutrient deficiencies during pregnancy result in offspring predisposed to type 2 diabetes, particularly if they are exposed to other risk factors in later life, such as a Western diet and physical inactivity leading to obesity. A fetus may also receive fewer nutrients due to teenage pregnancy, where the growing mother competes with her offspring for resources; in pregnancies complicated by maternal vascular disease, which may occur in women who become pregnant later in their reproductive life; and when placental problems exist. The decrease in fetal growth observed in the newborn baboons was only about 10 percent, very similar to many human babies born growth restricted.
Asthma Linked to Depression during Pregnancy
Anxiety, stress and depression during pregnancy may lead to a greater risk of asthma for your child. Study results are published in the July issue of Annals of Allergy, Asthma & Immunology, the scientific journal of the American College of Allergy, Asthma and Immunology (ACAAI).
“Approximately 70 percent of mothers who said they experienced high levels of anxiety or depression while they were pregnant reported their child had wheezed before age 5,” said Marilyn Reyes, lead author of the study. “Understanding how maternal depression affects a child’s respiratory health is important in developing effective interventions.”
The study of 279 inner-city African-American and Hispanic women was conducted before, during pregnancy and after birth. The study results support growing research that the prenatal period is a time when children are particularly susceptible to asthma-related risks. While somewhat similar findings have been reported in non-minority populations, this study at the Columbia Center for Children’s Environmental Health is the first to report an association between stress and wheeze in minority populations.
Common asthma symptoms include:
• Coughing, especially at night
• Wheezing or whistling sound, especially when breathing out
• Trouble breathing or fast breathing that causes the skin around the ribs or neck to pull in tightly
• Frequent colds that settle in the chest
“Approximately 70 percent of mothers who said they experienced high levels of anxiety or depression while they were pregnant reported their child had wheezed before age 5,” said Marilyn Reyes, lead author of the study. “Understanding how maternal depression affects a child’s respiratory health is important in developing effective interventions.”
The study of 279 inner-city African-American and Hispanic women was conducted before, during pregnancy and after birth. The study results support growing research that the prenatal period is a time when children are particularly susceptible to asthma-related risks. While somewhat similar findings have been reported in non-minority populations, this study at the Columbia Center for Children’s Environmental Health is the first to report an association between stress and wheeze in minority populations.
Common asthma symptoms include:
• Coughing, especially at night
• Wheezing or whistling sound, especially when breathing out
• Trouble breathing or fast breathing that causes the skin around the ribs or neck to pull in tightly
• Frequent colds that settle in the chest
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