As in pregnancy, what you eat while breastfeeding is passed on to your baby. By maintaining healthy eating habits when breast feeding, you can help keep you and your baby well-nourished and support his/her developing taste for healthy foods. There is also no convincing evidence that you should avoid or limit major allergens (milk, eggs, peanuts, tree nuts, soy, wheat, fish and shellfish) from your diet while breast feeding, unless you yourself are allergic to a particular food. Some foods, drinks and ingredients are best limited or avoided while breastfeeding, including alcohol, high mercury fish (shark, swordfish, tilefish and king mackerel), and caffeine.