Do you know anything about health food ?   It is so popular among people to preserve health now , so I read some books about health food .   Can you give me some examples ?   Drinking warm and fresh water in the morning on wakening up is one of ways to keep healthy .   Really ? Why we must have warm and fresh water ?   Warm water can be good for your stomach , which is empty at that moment . And freshness can keep the water active to clean your digest system . 