There are varying ideas on what to do for healthy hair, from using eggs for dry hair to using lemon for oily hair, or applying mayonnaise for chemically treated hair and beer to provide a little more bounce.  We do know for sure that healthy eating and exercise is very important, and of course using the best hair products available.  The nutrients in foods are the building blocks for your hair, so a variety of healthy foods are essential.  Here are some of the foods that will help keep your hair healthy: