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Vegetarian diet.
There are many kinds of vegetarianism, but most of them do not get food from animal origin (excluding eggs, milk and honey).
Over the years, studies have shown that vegetarians are less likely to be overweight and rarely worry about cardiovascular diseases.
Many well-known people are vegetarian and they think it's useful for us as well as for the whole planet.
Small list:
Alice Silverstone
Charlotte Bronte
Bernard Shaw
Albert Einstein
Jillian Anderson
Pamela Anderson
Leonardo Da Vinci
Syed O Conary
And many other outstanding people live according to this diets and vegetarian rules.
Vegetarian - diet diet