Yes, but it's easier to do in a Jewish establishment.
An overweight and an obese patient would be put on a liquid or BRAT diet.
They can eat a kosher diet, and be slaughtered the kosher way.
Kosher, when dealing with food and diet, simply refers to rules for the preparation and consumption of food. It has no bearing on the quality of diet itself. As such, there is nothing intrinsically good or bad about a kosher diet in terms of health.
The general meaning for kosher is "clean/fit or proper" and if you relate this to the cabbage soup diet, yes it is kosher and can help you stay healthy.
Keeping kosher.
Yes.
Leviticus 11
Keeping kosher.
See the links.
what happens if you do not follow a prescribed diet
Judaism. See also:http://judaism.answers.com/jewish-laws/laws-of-keeping-kosher
There is nothing non-kosher in the ingredients for peanut butter and there are several brands of peanut butter that are certified kosher.