For example, if you say that too many people in poor communities have problems with alcoholism, you should ask yourself but why?. Once you come up with an answer to that question, probe the answer with another but why? question, until you reach the root of the problem, the root cause.
Vitamins, one of the most essential nutrients required by the body and can be broadly classified into two main categories i.e., water-soluble vitamins and fat-soluble vitamins. Water-soluble vitamins cannot be stored in the body, so you need to get them from food every day. They can be destroyed by overcooking.
1 The difference (if any) between vitamins that are water soluble and those that are not -- There is a big difference between the water soluble vitamins and the fat soluble vitamins and this is absolutely a critical distinction.  Specifically Vitamin E -- Vitamin E is a fat soluble vitamin.