A pregnancy diet should add about 300 calories per day, and women at normal weight should gain about 1 to 4 pounds during the first trimester and then 2 to 4 pounds per month thereafter, registered dietitian Bonnie Taub-Dix writes. Pregnancy diets should include protein for muscles and growth, healthy carbohydrates to ward off nausea and cravings, calcium, and foods with docosahexaenoic acid and omega-3 fatty acids, Taub-Dix writes.

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