Proper nutrition is crucial to overall health and wellbeing.  Figuring out what proper nutrition means for you can be the challenging part.  Your nutritional needs and ideal diet depend on your unique metabolism, body chemistry, medical conditions, and lifestyle.  Some people advocate a well-rounded diet, including a large selection of common food items.  Others emphasize specific food groups, like vegans or vegetarians.  Others focus on nutritional supplements, such as Omega-3 fatty acids (most commonly in the form of fish oil or flax seed oil.)  Some groups advocate food preparation techniques they say will improve health, such as eating only raw foods.  Proponents say that eating uncooked foods is anatomically natural, that our ancestors ate the vast majority of their foods raw.