Often time, I have discussed with many people regarding this topic and did some research about it. A healthy body meaning:

1. No over weight

2. Three fast: fast sleep, fast eating and fast pupu

Fast sleep represents no stress, pressure and good immunization system

Fast eating represents the digesting system working good.

Fast pupu represents the excreting system working good.

If you pay attention to compare western people and eastern people, you will see the over weight people percentage in the western countries are more than eastern countries. Why? I think the most factors are:

1. Too much sugar

2. Too much meat

3. Less exercise

There are too much sugar in your daily meal: soda, cake (always super sweet) etc.

Meat is so cheap in the western countries, it's cheaper than vegetable, so people buy meat more than buy vegetable.

Comfortable enviorment causes people not exercise in the Western countries.

All these there are just opposite way in the eastern countries.

Many people may say that because of the gene. Well, that's maybe the case, but not the major reason, I think. Next time I will discuss more details about it.

You are welcome to join the voting here: http://www.scientistsolutions.com/t6802-What_s+the+most+important+reason+caused+people+overweighted.html