What we put into our bodies can always affect us in different ways. Some individuals may be highly sensitive to sugar or gluten, while others may have issues being allergic to eggs or shellfish. The nutrients we also receive from food can impact us negatively or positively, which makes what we eat on a daily basis very important. You cannot live on a diet of ice cream or fatty foods and not expect to gain weight and experience some medical issues down the road. It may be fine at first, but overall you will likely not be in the best of health.