There are NO foods that you should avoid simply because you are breastfeeding! It is generally recommended that a nursing mother eat whatever she likes, whenever she likes, in the amounts that she likes and continue to do this unless baby has an obvious reaction to a particular food.
There are a few exceptions...
-It's suggested that everyone, particularly pregnant and nursing mothers, avoid eating certain types of fish that are typically high in mercury.
-It is a good idea to restrict caffeine and alcohol to a certain extent, but it is rarely necessary to eliminate them.
-Some food proteins (such as cow's milk protein or peanut protein) do pass into mother's milk. If there is a history of food allergies in your family, you may wish to limit or eliminate the allergens common in your family.
-Any baby might react to a particular food (although this is not very common). If baby has an obvious reaction every time you eat a certain food, it may be helpful to eliminate that food from your diet.