March 2, 2009
Polycystic Ovary Syndrome: Unique Concerns During Pregnancy and Lactation
By Angela Grassi, MS, RD, LDN
For The Record
Vol. 21 No. 5 P. 24
For many women with PCOS, conceiving is only the first hurdle. These women face particular challenges but can achieve healthy pregnancies by paying attention to special emotional, health, and dietary needs.
Polycystic ovary syndrome (PCOS) is identified as a state of hyperinsulinemia and hyperandrogenism. Affecting 8% to 10% of reproductive-age women, it is the main cause of ovulatory infertility in the United States.1
Pregnancy can be an exciting time for women with PCOS, especially because so many of them may have been trying to conceive for years, with or without fertility treatments. In addition, being pregnant is a sign of femininity, and it may be a relief to some women who have felt masculine due to their “male” shape and symptoms, such as excess hair growth and balding.
However, having PCOS and being pregnant does pose concerns. Some women who have undergone fertility treatments may carry multiple babies and will have special dietary and medical needs. Also, because many women with PCOS have hormonal imbalances and are overweight or obese, they are at a higher risk for miscarriage and complications such as gestational diabetes mellitus and hypertensive disorders during pregnancy.2-6 Proper medical management and medical nutrition therapy are imperative to prevent the onset of these complications and optimize fetal growth and development.
Many women with PCOS who are able to conceive may have misconceptions about eating healthy during pregnancy. Popular diet guidelines (mostly from the Internet) for PCOS recommend a very low-carbohydrate diet, but current evidence does not support this thinking. Women who follow these recommendations may feel apprehensive about eating foods such as fruits, vegetables, legumes, and grains—all of which provide important vitamins, minerals, and fiber that are essential for fetal growth and development. Women may also be inclined to limit carbohydrates out of fear of gaining too much weight or to prevent gestational diabetes mellitus. (Currently, no evidence supports limiting carbohydrates during pregnancy to prevent gestational diabetes mellitus.) Women with PCOS should be aware of negative attitudes toward food and weight and know the importance of consuming whole grain and whole food carbohydrates in sufficient amounts.
On the other hand, some women may think pregnancy gives them license to eat anything they want. For the first time, they may feel less pressure to restrict their intake in a society preoccupied with thinness. If these women were restrictive with their diet prior to conceiving, this could lead to binging during pregnancy, resulting in excessive weight gain. Additionally, women who already struggle with anxiety and depression may feel that these conditions are exacerbated during pregnancy and may turn to food for emotional support. A study published in the Journal of the American Dietetic Association in 2005 found that pregnant women who reported high stress, anxiety, and fatigue consumed more carbohydrates, fats, and protein and less vitamin C and folate.
It is common for a woman who followed a prepregnancy limited-carbohydrate diet to abandon this way of eating while pregnant, turning to once-forbidden refined carbohydrates and foods high in saturated fat. Such a move can lead to excessive weight gain during pregnancy, increasing the chances of adverse health risks such as gestational diabetes mellitus.
Body image issues can also be of concern during pregnancy, as those who have struggled to keep the pounds off for much of their lives may fear that their weight will spiral out of control. They may also have difficulty accepting weight gain and growing larger in general. Women with PCOS also carry their weight in their midsection and may not appear pregnant until their third trimester, causing some to struggle with body image concerns of failing to look pregnant.
Because most women with PCOS have hormonal imbalances and are overweight or obese, they are at a higher risk for miscarriage and complications such as gestational diabetes mellitus, preeclampsia, macrosomia, and preterm labor during pregnancy.7-13 Research has also indicated that infants born to women with PCOS have higher rates of admission to neonatal intensive care units.14
In women with PCOS, many physicians recommend initiating an oral glucose tolerance test sooner. They also recommend testing at 20 weeks gestation to screen for gestational diabetes mellitus and, if normal, repeat it by the standard screening time for all pregnant women between 24 and 28 weeks gestation. Proper medical management and medical nutrition therapy are imperative to prevent the onset of medical complications and optimize fetal growth and development. Postmeal physical activity, such as walking for 10 to 20 minutes, can help manage blood pressure and insulin resistance by controlling postprandial hyperglycemia.
For women with PCOS, pregnancy should be considered a state of pregestational diabetes mellitus and as a precaution, diet guidelines should reflect those for gestational diabetes mellitus. A slight reduction in carbohydrate intake of 35% to 40% of total calories is therefore suggested and consistent with the American Diabetes Association guidelines for gestational diabetes mellitus. The majority of carbohydrates should be of whole grain and high-fiber quality, with at least 28 grams each day (the dietary reference intake requirement) for optimal glucose and insulin control. It’s important to distribute these carbohydrates evenly throughout the day—ideally in the form of three meals and two to four snacks, as well as an evening snack that will help manage glucose levels throughout the night.
All meals and snacks must include protein-rich foods to help stabilize glucose levels. Due to the high rate of miscarriage and gestational diabetes mellitus related to elevated insulin levels, women with PCOS should limit or avoid simple carbohydrates, including sweetened beverages (eg, juices, soft drinks, sports drinks), candies, and desserts.
Metformin is recommended for pregnant women with PCOS, as it can reduce the incidence of preeclampsia, macrosomia, gestational diabetes mellitus, preterm labor, and the risk of miscarriage.8,9 A study showed that at dosages between 1.5 and 2.55 grams per day, metformin did not affect the birth weight, length, growth, or motor-social development of 126 infants compared with their control counterparts.15 Metformin helps prevent gestational diabetes mellitus and improve pregnancy outcomes in women with PCOS by helping reduce preconception and pregnancy weight gain, hyperinsulinemia, and insulin resistance and secretion.2,3
Do Women With PCOS Have More Difficulty Breast-Feeding?
Because of the many hormonal imbalances associated with PCOS, researchers have speculated that some women may have a difficult time producing an adequate milk supply for their infants. The hormonal aberrations in PCOS involve insulin, progesterone, and estrogen, all of which are important to breast development and milk-secreting ability.16
Lisa Marasco, MA, IBCLC, is a lactation consultant who began studying the connection between PCOS and low milk supply after seeing two patients with PCOS in one day who had problems with milk production. In her thesis, she studied a group of 30 women with lactation failure and found that more than one half of them were obese, 57% had a history of infertility, and 67% experienced oligoamenorrhea or amenorrhea. According to Marasco, some women with PCOS may have more difficulty producing adequate milk because the breast tissue fails to undergo the normal physiological changes during pregnancy needed to prepare for lactation or perhaps because not enough breast tissue existed prior to pregnancy (hypoplasia). Women with PCOS have low levels of progesterone, which is needed for alveolar growth and breast tissue development. Insulin also plays a role in milk production, and having insulin resistance may contribute to lactation problems in women with PCOS, according to Marasco’s research.
As a precaution, lactation consultants recommend that all women with PCOS pump after feedings for at least 10 to 15 minutes on each breast to help establish an adequate milk supply in the first two weeks of initiating nursing. Frequent feedings with full drainage can also help maximize milk production, as can consuming an adequate amount of food and fluid each day. For mothers with a low milk supply, extra breast stimulation via frequent nursing or pumping sessions is crucial. Skin-to-skin contact is also encouraged to boost milk production.17
Milk supply problems may be prevented or ameliorated by establishing early intervention strategies during pregnancy. This may include obtaining resources for local breast-feeding support groups and preparing to work with a board-certified lactation consultant soon after giving birth. Good breast-feeding management, including proper latch and positioning, are imperative to successful milk production and proper infant growth and development.
According to Marasco, all of these tactics will help establish the foundation for good milk supply, yet they do not address the underlying problems. Although not scientifically tested, goat’s rue, fennel, kale, verbena, chasteberry, and fenugreek are herbal supplements reputed to increase milk supply and possibly stimulate breast growth.18,19 Using progesterone supplements and metformin during pregnancy may also help support an adequate milk supply in women with PCOS and possibly support breast development during pregnancy. Marasco claims she has tried metformin with “a number of PCOS moms with low supply and, in some cases, metformin alone increases milk production.” However, she adds, “Metformin is not going to help much if the woman does not have enough breast tissue in place to begin with.”
Medications such as metoclopramide can also be prescribed to boost milk supply. Interestingly, while some women with PCOS experience low milk supply, others report an overabundance of milk production. Evidently, this area needs more research.
Metformin Safety Concerns
Since many women choose to take metformin during pregnancy for the benefits discussed previously, they may be inclined to continue taking metformin while they breast-feed to prevent a “rebounding” of PCOS symptoms after birth, control insulin levels, and possibly help produce an adequate milk supply. However, the use of metformin during lactation is controversial.
Limited information exists about whether metformin is safe to take while breast-feeding. The few studies that are available have consisted of relatively limited sample sizes, and results show that while metformin does cross into the milk supply, it is in “clinically insignificant” amounts with no adverse effects on infants.20-22 The most recent and largest study was conducted among 61 nursing infants and 50 formula-fed infants born to mothers with PCOS who took an average of 2.55 grams of metformin per day throughout pregnancy and lactation.23 The infants were followed up to 6 months of age with results showing that the breast-fed infants of mothers who took metformin had no adverse health risks in regard to growth or motor-social development.23
However, while researching this article, numerous pediatricians, obstetricians, and reproductive endocrinologists offered conflicting advice about whether to take metformin while nursing. Some physicians do not feel comfortable advising women to breast-feed while taking the medication because of the lack of evidence supporting safety, especially because research has indicated that metformin does cross into the milk supply. Other physicians say they have been instructing moms to stay on metformin while breast-feeding as infants have already been exposed to it in utero (metformin does cross the placenta) and because it does not appear to be teratogenic, cause hypoglycemia, or pose any adverse health risks.
Until more long-term and larger studies are conducted, women with PCOS who plan to breast-feed while on metformin should discuss their options with their physician and carefully make a risk-benefit analysis beforehand. If a woman does decide to take metformin while nursing, frequently monitoring the infant’s health and feeding habits is advised.21,22
— Angela Grassi, MS, RD, LDN, is the author of The Dietitian’s Guide to Polycystic Ovary Syndrome and The PCOS Workbook: Your Guide to Complete Physical and Emotional Health.
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