During the first trimester, and throughout the pregnancy, it's important to eat a balanced diet that includes a variety of nutrient-dense foods from all the food groups. As best you can, include whole grains, fruits and vegetables, healthy proteins such as fish, poultry and beans, low-fat dairy foods and healthy fats such as olive oil. Plant-based foods are the richest in nutrients and should be the focus of most of your meals, says the Academy of Nutrition and Dietetics.
While you may be dealing with cravings and nausea, try to limit your intake of foods filled with added sugar and fat to limit your intake of empty calories. Additionally, to limit your exposure to mercury, you shouldn't eat any tile fish, swordfish or king mackerel throughout your pregnancy.