I'm worried I'm not taking in enough vitamins and minerals in my body. My daily diet usually consists of white bread, eggs, cheese, chicken or meat, often macaroni or rice, milk, potatoes, and oatmeal. I only consume some vegetables and fruits here and there (and not much either). Does taking multi-vitamin pills as a 19 year old really make the difference in the short term? How about later on in life as a senior citizen?