The role of nutrition in medicine is becoming more important than ever. There is no certain evidence that a dietary lack of any single nutrient is a significant cause of miscarriage. At the present time, there is no strong evidence linking even malnutrition to an increased rate of miscarriage. But pregnancy is certainly no time to be dieting, and those women in poorer circumstances, without access to fresh foods, fruits, and vegetables, may well run a higher risk of miscarriage,
Women often worry that their nausea, vomiting, or lack of appetite, in the first trimester (12 weeks) of pregnancy, may cause a miscarriage. They feel their nutritional levels are so poor that the baby is being starved. In fact, even when vomiting has reached extreme proportions, requiring hospitalization (known medically as hyperemesis gravidarum), there is still no increase in the rate of miscarriage.

Ironically, it is often true that the more nauseated you are in early pregnancy, the less chance you will have of miscarrying. Those aggravating symptoms of nausea and the extreme fatigue in the first trimester may be indications that the hormone levels required by the pregnancy are adequate.