God created the havens and earth and god gave man every seed-bearing plant and every tree that has fruit with seed in it. These food is all vegetable food that don`t take diseases of adult people. But God gave Noah the green plants. Everything that lives and moves will be food for Noah. Just as God gave man the green plants. And then man must not eat meat (animal protein food) that has its lifeblood still in it and God must not eat fat in it. The fat contains much fat(saturated fatty acids) and cholesterol that have susceptibility to disease of coronary heart, hypertension and atheriosclerosis etc. God must not eat these fat before we don`t know that it have susceptibility to disease of adult people.