What kind of knowledge one should have during pregnancy?

Healthy natural food: A woman should eat healthy, natural foods before, during, and after pregnancy. Healthy usually means low in fat (especially low in animal fats), a moderate amount of protein, and a moderate amount of whole grain carbohydrates (but very little sugar). Natural means unprocessed, with little salt, sauces, or preservatives. Salt may increase water retention or swelling. Hot sauce may worsen heartburn.