Calories
You should try to eat as many foods as possible from the bottom of the food pyramid. If you gain weight too slow, try eating small meals and slightly increase the fat in your diet. You should always eat when you are hungry, as you are now eating for 2 instead of one.

Calcium

By the second trimester, you’ll need around 1,500 milligrams of calcium each day for your bones and your baby’, which is more than a quart of milk. Calcium is something that’s missing from many diets. Along with milk, other great sources for calcium include dairy products, calcium fortified juices, and even calcium tablets.

Fiber

Fiber can help to prevent constipation, which is a common pregnancy problem. You can find fiber in whole grains, fruits, and even vegetables. Fiber supplements such as Metamucil and Citrucel are safe to take during pregnancy.

Protein

Unless you happen to be a strict vegetarian, your protein intake is not normally a problem for women who eat a healthy diet.

Iron

A lot of women will start their pregnancy off with a bit of iron deficiency. Good sources of iron include dark leafy green vegetables and meats. Iron supplements should be avoided, as they can cause internal symptoms such as cramping, constipation, or diarrhea.

Vitamins

Seeing as how you get a majority of the vitamins you need in your diet, you may want to discuss prenatal vitamins with your doctor.
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