Top 7 Foods to Eat During Pregnancy Pregnancy, also known as gestation period, is the period during which offspring develops inside a woman. And in such a condition, when body needs supplementary nutrients, vitamins and minerals, a healthy diet is extremely mandatory to maintain. During 2nd and 3rd trimesters, pregnant women need around 350-500 more calories, surplus proteins and calcium to meet the needs of the growing fetus. Choosing healthy and nutritious diet helps to ensure the health of the