Originally Answered: how much weight would a person lose eating only healthy foods for a couple months?
If you want to lose weight safely, then you need to do consider 2 things:
Are you looking to take off excess (unhealthy) weight? If that is the case, stick to 2 very important guidelines.
1. Eat with your personal nutrition in mind.
2. Get out and get physically active. Sports, walking, swimming, sex (if you are an adult) and any other outdoor activity.
My Father is overweight, but while he was in the Army he had gotten well over his limit of his weight/height/age, so the army put him on what they call the "FAT BOY" program. The military is a good source to go to for physical fitness and health sources.
But each person is a little different. Check with your doctor to see if you should lose the weight in the first place. If the doctor says that you should, then he/she will give you a list of do's and don'ts for food as well as possibly an exorcise regimen to follow for your case.
Start by cutting out (almost entirely) red meat and other fatty foods and snacks.
No more french fries unless they are cooked in vegetable oil or baked.
No Mayonnaise that is not low/no fat.
No cheese that is not no/low fat.
Eat things like skinless turkey/turkey based meats, fish, chicken (no skin) and vegetables. Basically a balanced diet, not a vegan one.
Grapefruit and other citrus are good for burning fat, but not the best, unless you lead a very sedentary life.
Eat more fruit and no junk food for snacks. It is the junk food that has made us an obese nation.
DO NOT LISTEN TO THE LIES OF VEGANS. Sure, you will lose the weight, but like a supermodel, it will not be a healthy weight loss. You want a healthy weight loss.
There are thousands of sources for this information on the web, but avoid those "lose weight quick" schemes, since those never last or never actually work.
Now if you are just doing "ego-based" dieting, then don't bother.
It is not only unhealthy, but will cause you to waste your whole life, creating an unhealthy obsession with weight loss. Some people are just naturally a bit overweight. It happens, just like some people are just naturally extremely skinny. It happens, so, in that case, just eat a balanced diet and stay away from fatty foods.