In recent years, vegetarianism has become a choice for many women, with some adhering strictly to plant-based diets even during pregnancy and childbirth. Some expectant mothers, however, deliberately eat lightly during pregnancy due to loss of appetite or fear that excessive nutrition will lead to weight gain that is difficult to shed later. It is important to understand that adequate nutrition is essential for the healthy development of the fetus throughout the ten months of pregnancy.Long-term vegetarianism during pregnancy may pose risks to fetal development.
Expectant mothers should prioritize balanced nutrition during pregnancy
Prenatal diets should be diverse and nutritionally balanced. A balanced diet provides hygienically sound, nutritionally comprehensive meals with appropriate nutrient ratios, tailored to individual weight gain needs. Weight gain that deviates from the recommended range is undesirable.
Pregnant women should avoid vegetarian diets
Fan Zhihong, Associate Professor in the Department of Nutrition and Food Safety at China Agricultural University's College of Food Science, stated in her blog that while vegetarianism offers many benefits, it isn't suitable for everyone—pregnant women are particularly discouraged from adopting it.Fan Zhihong explained that pregnant women experience heightened metabolism and rapid cellular growth, demanding substantial nutrients. However, essential nutrients for human growth and development—such as vitamin B12 and vitamin D—are almost exclusively found in animal-derived foods.
Additionally, while various plant foods contain iron and zinc, their forms differ from those in animal sources. Moreover, plant foods often contain multiple "anti-nutritional factors" (substances that hinder nutrient absorption), making these trace elements difficult for the body to absorb and utilize.
Therefore, for groups with high nutritional demands like young children and pregnant women, as well as individuals with anemia or zinc deficiency, adopting a strict vegan diet without supplemental nutrients may worsen their conditions. For pregnant women, deficiencies in these micronutrients can further impact fetal development.
Managing High Blood Sugar During Pregnancy
In the case mentioned above, the mother exhibited high blood sugar symptoms in the late stages of pregnancy but failed to control them. Babies born to mothers with diabetes are prone to neonatal hypoglycemia, aligning with Dr. Zhang Silai's analysis. Dr. Lü Xiaoyan, Chief Physician of Obstetrics at Guangdong Provincial Second People's Hospital, emphasizes that expectant mothers with high blood sugar must pay close attention to their diet and manage their blood sugar levels.
Poor blood sugar management during pregnancy increases risks of gestational hypertension, polyhydramnios, infections, difficult labor, and cesarean sections. Excessively high blood sugar may also lead to miscarriage, birth defects, preterm birth, intrauterine growth restriction, macrosomia, neonatal respiratory distress syndrome, and neonatal hypoglycemia—all posing significant hazards to the baby.
Vegetarian Diets Can Also Include Unhealthy Foods
Many assume vegetarian foods are inherently healthy. However, Fan Zhihong clarifies that vegetarian options vary in nutritional value. Many nutritionally poor foods—such as white sugar, potato chips, puffed snacks, instant noodles, fried dough sticks, sugary drinks, candied fruits, and margarine—can technically be classified as "vegetarian" but are detrimental to health.Therefore, a vegetarian diet can still lead to weight gain, high blood sugar, and high cholesterol.
The case study mentioned above shows a pregnant woman developing high blood sugar in her later trimester, indicating her diet likely contained excessive sugary foods. Thus, while she believed she was eating "healthily," she may have actually been consuming unhealthy foods.
Thus, while excessive nutrition during pregnancy is undesirable, relying primarily on vegetarian meals daily also hinders fetal development. A balanced diet combining both plant-based and animal-based foods represents the optimal approach for pregnancy nutrition. Additionally, pregnant women should avoid excessive consumption of highly nourishing foods.
Pregnant women should prevent nutritional deficiencies in their diet to maintain optimal physical condition, ensuring their blood contains sufficient nutrients essential for fetal development.
Prenatal Nutrition: Balance to Prevent Malnutrition
Balanced nutrition is the fundamental principle for perinatal dietary management.
Pregnant women's diets must first adhere to balanced nutrition principles. A balanced diet requires diverse food sources. The Chinese Dietary Guidelines, recommended by the Chinese Nutrition Society, clearly embody these principles.Given the nutritional requirements, physiological changes, and metabolic characteristics during pregnancy, the pregnant woman's diet should be adjusted based on these principles. Examples include appropriate folic acid supplementation during the pre-pregnancy period and moderate increases in animal-based foods rich in high-quality protein during the second trimester.Extensive research indicates that folate deficiency can cause embryonic neural tube defects. Since the 1–3 weeks following fertilized egg implantation represent a critical period for embryonic differentiation and neural tube closure, folate deficiency during this phase is a primary risk factor for neural tube defects.Surveys indicate that among Chinese women of childbearing age not receiving folic acid supplementation, the average folate deficiency rate is 30%. This rate is higher in northern regions than southern regions, and higher in rural areas than urban areas, reaching as high as 70% in northern rural areas and varying seasonally. Intervention studies show that preconception prophylactic folic acid supplementation reduces the risk of neural tube defects by 85% in northern China and by 40% in southern China.Additionally, folate facilitates the remethylation of homocysteine—an intermediate metabolite in the methionine cycle—back into methionine, thereby lowering the risk of hyperhomocysteinemia. Elevated homocysteine levels increase the risk of cardiovascular disease and cancer in adults, and during pregnancy, it is a risk factor for complications such as gestational hypertension and preeclampsia.Given these dual considerations, a folate-rich diet or supplementation from the periconceptional period onward is essential.
Dietary folate sources fall into two categories: first, folic acid—the simplest form of folate—which is virtually absent in natural foods and must be synthetically produced for use in supplements and fortified foods. It is stable and nearly fully absorbed.Second, folate from natural foods, which has a complex structure and must first be converted into simple folic acid within the body to be utilized. Its bioavailability is approximately 50% of standard folic acid. Primary dietary sources include green leafy vegetables, asparagus, strawberries, peanuts, and legumes.
When evaluating folate intake, it is essential to distinguish between folic acid from supplements, fortified foods, and natural foods. Due to differences in bioavailability between supplemental folic acid and dietary folate salts, the Dietary Folate Equivalent (DFE) is used as a standardized measure.Calculations of folate intake should include folate from natural foods in the diet, folate from fortified foods, and daily oral folate from supplements.
The current recommended dietary intake for pregnant women at all stages is 600 micrograms DFE/day, with 400 micrograms DFE/day recommended during the preconception period. The maximum tolerable daily intake is 1000 micrograms DFE for all stages.Women of childbearing age who may become pregnant should consume folate-rich foods—such as animal liver, dark green vegetables, and legumes—as early and as frequently as possible. Additionally, they should begin taking a daily folate supplement of 400 micrograms at least three months before conception and continue throughout pregnancy.>Prevention and control of iron-deficiency anemia and iron deficiency are critical perinatal nutrition concerns.
Specialized surveys and the National Nutrition and Health Survey indicate persistently high prevalence of iron-deficiency anemia and iron deficiency among Chinese pregnant women and lactating mothers. Prevalence rates range from 9.6% to 33.8% for iron-deficiency anemia and 38.8% to 51.6% for iron deficiency during early, mid, and late pregnancy, respectively.and the combined prevalence among urban and rural lactating mothers reaches 30.7%. Iron deficiency during the periconceptional period not only compromises women's health but also reduces fetal iron stores, becoming the primary cause of iron deficiency anemia and iron deficiency in newborns and infants.
Dietary iron intake among Chinese pregnant women ranges from 23 to 25 milligrams daily, which falls significantly short of the 2000 recommendations by the Chinese Nutrition Society for iron intake during mid- and late-pregnancy(15 mg for early pregnancy, 25 mg for mid-pregnancy, and 35 mg for late pregnancy). In contrast, the dietary iron intake of women of childbearing age in the United States is 13.2 mg/day, with an anemia prevalence rate of less than 4%.Evidently, the high prevalence of iron deficiency among Chinese women stems not from inadequate dietary iron intake, but from relatively low iron absorption and utilization rates. Iron-fortified soy sauce, as a dietary supplement, offers high absorption efficiency and effectively addresses iron deficiency.