Pregnancy After Bariatric Surgery

Pregnancy After Bariatric Surgery: Endocrinologist and Dietitian Approach

Obesity is a serious disease of our era. Over time, not only has the prevalence of obesity increased in society, but also its severity and the associated health complications. It is more difficult for obese patients to conceive compared to non-obese individuals. The serious health problems encountered in obese pregnancies challenge physicians who follow these patients. Medical nutrition therapy, exercise, behavioral therapy, and, when necessary, medication may not always be sufficient for the treatment of obesity. Especially in patients with severe obesity, rapid weight loss can be achieved through surgical techniques such as sleeve gastrectomy and various procedures involving the stomach and intestines. Particularly in patients with uncontrolled diabetes, high cardiovascular risk, limited mobility due to excess weight, and severe sleep apnea, and in those who have not benefited from non-surgical treatments, surgical methods stand out as a strong option. However, it is important that the patient is evaluated and prepared by an endocrinologist, operated on by an experienced surgical team, and thoroughly informed about possible risks and the postoperative process.

Today, a significant number of women who have undergone bariatric surgery are encountered in our country. An article published in JAMA in 2008 reported that bariatric surgery increased eightfold between 1998 and 2005. It was observed that 80% of these patients were women, and half of them were of reproductive age. Menstrual irregularities, hormonal imbalances, and problems with ovulation and egg quality are observed in 30–47% of obese patients. Elevated androgen levels and hyperinsulinemia due to weight gain are important factors in these patients. With bariatric surgery, hormonal disorders improve in one-third of overweight patients with polycystic ovary syndrome and in a large proportion of other obese patients. Impairment in sexual activity quality is more common in obese individuals of both sexes compared to those of normal weight. Especially in patients with severe obesity who are planning pregnancy, they may be referred to surgical centers after evaluation of risks and benefits by an endocrinologist, aiming to minimize surgical intervention if necessary.

Due to impaired oral absorption, tablet-form contraceptives are not preferred for pregnancy prevention. Pregnancy is allowed 12–18 months after bariatric surgery. This period is necessary for wound healing, the formation of healthy and strong scar tissue, reduction of metabolic risks, and strengthening of abdominal muscles. All these factors are essential to establish balance and ensure a healthy pregnancy.

In patients who have undergone bariatric surgery, serious gastrointestinal complications such as ulcers, reflux, gastritis, dumping syndrome (a condition characterized by sleepiness and hypoglycemia after meals), severe iron deficiency, deficiencies in vitamin B12, folic acid, zinc, and vitamin D may occur.

Before pregnancy, it is important to monitor anemia, vitamin levels, diabetes risk, blood pressure, sleep apnea, and joint problems at regular intervals. Monitoring urinary ketones is important both before and during pregnancy. Replacing vitamin and mineral deficiencies after surgery is essential for achieving and maintaining a healthy pregnancy. It is important to observe the reduction in cardiovascular risk and improvement in metabolic status during follow-up. Approximately 12–18 months are required for the body to recover and reach the optimal condition for pregnancy. Before planning pregnancy, retinal examination, cardiology evaluation, assessment for varicose veins or thrombosis in the lower extremities, abdominal ultrasonography, measurement of lung capacity, and vaccinations for pneumonia, influenza, and hepatitis are recommended.

Individuals who have undergone bariatric surgery may have a higher risk of preterm birth compared to obese individuals who have not undergone surgery. Nausea and vomiting may be more severe in early pregnancy. Once pregnancy occurs, nutritional support is crucial to maintain maternal weight and ensure fetal development. Due to malabsorption caused by surgery, higher intake of vitamins and minerals is required compared to normal pregnancies. In some cases, intravenous supplementation may be necessary.

Weight Gain During Pregnancy: According to the Institute of Medicine recommendations, individuals with a normal body mass index (kg/m2) should gain 11–16 kg during pregnancy, overweight individuals 7–11 kg, and obese individuals 5–9 kg. If weight gain deviates from these ranges, nutritional monitoring should be intensified. Otherwise, risks such as preterm birth may increase.

Protein: In normal pregnancies, protein intake of 0.9 grams per kg is recommended until the 6th month, and 1 gram per kg in the last trimester. There are no definitive recommendations after bariatric surgery. Protein intake should be determined by a dietitian based on the type of surgery and the time elapsed since the operation.

Minerals and Vitamins: Iron requirements increase during pregnancy. Dietary iron intake should be increased. The physician will monitor hemoglobin levels and recommend supplementation when necessary. Iron and calcium should not be taken together; therefore, calcium-rich foods such as yogurt and milk should be consumed at least one hour before or after iron supplements. Intravenous iron supplementation should be avoided in the first trimester.

• Bariatric surgery affects calcium balance. Calcium intake should be higher in pregnancies after bariatric surgery to support bone and dental health of both mother and baby.
• Low magnesium levels can cause cramps in pregnant women. Supplementation may be taken under medical supervision, as excessive intake can lead to diarrhea. Iodine deficiency due to malabsorption is also significant and may require higher intake than in normal pregnancies.
• Low zinc levels may lead to preterm birth, low birth weight, and spina bifida. Therefore, zinc levels should be monitored regularly and supplemented during pregnancy.
• Folic acid deficiency can cause neural tube defects in the baby. Women who have undergone bariatric surgery should start folic acid supplementation at least 4 weeks before pregnancy and continue during pregnancy. Intravenous supplementation may be required if necessary.
• Vitamin B12 deficiency can lead to neurological problems in the baby. Nearly half of women who become pregnant after bariatric surgery have B12 deficiency. Supplementation should be provided orally or intravenously if needed.
• The Endocrine Society recommends a maximum daily intake of 4000 IU vitamin D for women planning pregnancy or who are pregnant. However, after bariatric surgery, this amount may be increased to 6000 IU.
• Vitamin A deficiency may cause vision problems, while vitamin K deficiency may lead to bleeding disorders. It should be remembered that excess vitamins A, D, E, and K are toxic. Therefore, no multivitamin supplements should be used without consulting a physician. During pregnancy, it is appropriate to monitor hemogram, urinalysis, ferritin, blood glucose, sodium, magnesium, calcium, phosphorus, folic acid, B12, creatinine, vitamin D, and TSH monthly or every 6 weeks.

Dumping Syndrome: Dumping syndrome may occur in individuals after bariatric surgery. It is characterized by rapid gastric emptying, leading to persistent hunger, fluctuations in blood sugar levels, weakness, fatigue, and headaches. Symptoms such as diarrhea, belching, and reflux may also be more frequent. During pregnancy, changes in gastrointestinal anatomy and hormonal fluctuations may exacerbate these symptoms. To prevent these issues, dietary habits must be carefully managed. Small portions with 6–8 meals per day are recommended. Each meal should include protein and be rich in fiber. Liquids should be consumed slowly and not together with meals. High glycemic index and fatty foods should be avoided. Fruit juices should be avoided even if freshly squeezed. Dietitian support is essential during this period.

Breastfeeding Period: It is recommended that all mothers exclusively breastfeed their babies for the first 6 months. Requirements for iron, calcium, vitamins A, D, E, K, B12, folic acid, and zinc increase in breastfeeding mothers who have undergone bariatric surgery. If intake is insufficient, levels in breast milk may also decrease, leading to developmental problems in the baby. These issues can be prevented with appropriate nutrition and supplementation.

Pregnant women with a history of bariatric surgery should be regularly monitored by an endocrinologist and a nutrition specialist. Regular follow-up and professional support are crucial to prevent complications in both mother and baby during pregnancy and breastfeeding. The mode of delivery (vaginal or cesarean) will be determined based on the overall condition of the mother and the baby at that time.

Dr Erdal DUMAN

Specialist Dietitian Doğa PEKSEVER