B12: Like folic acid, B12 is essential for healthy nervous system development and function. Pregnant women who are vegans or vegetarians may fall short on B12, since it is present in animal protein and to a lesser extent in dairy. Teenage and adult women need 2.4 mcg. Recommended levels rise to 2.6 mcg for pregnant women and 2.8 mcg for lactating women.
Nutrition is particularly important when you are pregnant. Weight gain during pregnancy is normal—and it's not just because of the growing fetus; your body is storing fat for lactation. The National Academy of Sciences/Institute of Medicine (NAS/IOM) has determined that a gain of 25 to 35 pounds is desirable. However, underweight women should gain about 28 to 40 pounds, and overweight women should gain at least 15 pounds. The IOM has not given a recommendation for an upper limit for obese women, but some experts cap it as low as 13 pounds. If you fit into this category, discuss how much weight you should gain with your health care professional. Remember that pregnancy isn't the time to diet. Caloric restriction during pregnancy has been associated with reduced birth weight, which can be dangerous to the baby.
^ Jump up to: a b c Aldridge, Robert W.; Story, Alistair; Hwang, Stephen W.; Nordentoft, Merete; Luchenski, Serena A.; Hartwell, Greg; Tweed, Emily J.; Lewer, Dan; Vittal Katikireddi, Srinivasa (2017-11-10). "Morbidity and mortality in homeless individuals, prisoners, sex workers, and individuals with substance use disorders in high-income countries: a systematic review and meta-analysis". Lancet. 391 (10117): 241–250. doi:10.1016/S0140-6736(17)31869-X. ISSN 1474-547X. PMC 5803132. PMID 29137869. All-cause standardised mortality ratios were significantly increased in 91 (99%) of 92 extracted datapoints and were 11·86 (95% CI 10·42–13·30; I2=94·1%) in female individuals
In the United States, infertility affects 1.5 million couples.[86][87] Many couples seek assisted reproductive technology (ART) for infertility.[88] In the United States in 2010, 147,260 in vitro fertilization (IVF) procedures were carried out, with 47,090 live births resulting.[89] In 2013 these numbers had increased to 160,521 and 53,252.[90] However, about a half of IVF pregnancies result in multiple-birth deliveries, which in turn are associated with an increase in both morbidity and mortality of the mother and the infant. Causes for this include increased maternal blood pressure, premature birth and low birth weight. In addition, more women are waiting longer to conceive and seeking ART.[90]
These challenges are included in the goals of the Office of Research on Women's Health, in the United States, as is the goal of facilitating women's access to careers in biomedicine. The ORWH believes that one of the best ways to advance research in women's health is to increase the proportion of women involved in healthcare and health research, as well as assuming leadership in government, centres of higher learning, and in the private sector.[155] This goal acknowledges the glass ceiling that women face in careers in science and in obtaining resources from grant funding to salaries and laboratory space.[178] The National Science Foundation in the United States states that women only gain half of the doctorates awarded in science and engineering, fill only 21% of full-time professor positions in science and 5% of those in engineering, while earning only 82% of the remuneration their male colleagues make. These figures are even lower in Europe.[178]
Give your body a little more credit: It tells you when you’re hungry—you may not be listening, though. Before chowing down because there’s only one slice of pie left or because the last guest arrived at the brunch, stop and check in with your stomach. “If you’re not hungry, make yourself a small plate and sip on some tea or coffee while everyone else digs in,” recommends Elle Penner, M.P.H., R.D., a MyFitnessPal expert. When your belly starts to finally grumble, food will be there.
In the past, women have often tried to make up deficits in their diet though the use of vitamins and supplements. However, while supplements can be a useful safeguard against occasional nutrient shortfalls, they can’t compensate for an unbalanced or unhealthy diet. To ensure you get all the nutrients you need from the food you eat, try to aim for a diet rich in fruit, vegetables, quality protein, healthy fats, and low in processed, fried, and sugary foods.
  Schools (and universities)  ↓/NC anemia, ↓ Fe-deficiency anemia, ↑/NC MN status [Hgb (↑ if anemic), ferritin, zinc, retinol], ↑ MN status [folate, riboflavin, 25(OH)D, iodine], ↓ PTH, ↓ goiter prevalence, ↓ MN deficiency (vitamin A, B-12, C), ↑ bone mineral accretion, ↑/NC weight gain/BMI, ↑ MUAC, ↑ gut inflammation, ↓/NC respiratory symptoms and diarrheal morbidity, ↑ fitness (for Fe-deficient subjects), ↑/NC short-term cognitive function  ↑ Hgb (↑ if anemic), ↑ serum ferritin, ↑ total body Fe, ↑ urinary iodine concentration, ↑ serum zinc, ↑ aerobic power, NC net energetic efficiency     

Micronutrient supplementation programs for vitamin A, iron and folic acid, calcium, zinc, and multiple micronutrients effectively impacted the micronutrient status of pregnant and lactating women, as well as women of reproductive age and adolescent girls (13, 14, 33, 35–48). Interventions making use of multiple micronutrients were more effective at changing plasma micronutrient concentrations than interventions focused solely on 1 nutrient alone (38, 42). In countries with comprehensive programs for iron supplementation during pregnancy, anemia prevalence dropped (1, 49). Positive health impacts of supplementation were most notable among pregnant women who were deficient and at risk of low intake (43, 50). However, there were some studies that showed inconsistent or limited evidence for the effectiveness of supplementation on other maternal health outcomes (31, 51–58).
Consult your health care professional. Women of childbearing age may want to consider taking folic acid supplements to reduce the risk of having a pregnancy affected with neural tube defects. Many women and teenage girls don't get enough calcium or vitamin D, both of which are critical to healthy bones and avoiding osteoporosis. Some people with diabetes appear to benefit from chromium. Vegetarians, especially vegans, may want to consider supplements to obtain nutrients they aren't getting from animal products.