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If You Are Seriously Obese... 

If you already have heart disease, or hypertension, diabetes, obesity, or a fat-related cancer, or a history of thrombotic stroke or its precursor, mini-strokes called transient ischemic attacks (TIAs), an evolutionary approach may not trim enough fat from your diet to prevent health disaster.
You may need the kind of revolutionary diet changes, Indiadiets Health Perfect (IHP) group has used to reverse heart disease. These diets derive only 10 percent of calories from fat. 

Indiadiets Health Perfect (IHP) Group divides foods into three categories:

Anytime. You may eat these foods whenever you feel hungry and until you
feel full: fruits, vegetables (except high-fat avocados and olives), beans, and
grains. 

Sometimes. You may eat these foods in moderation: nonfat dairy products
(skim milk, egg whites, nonfat yogurt, sour cream, and cheeses); nonfat or
very low-fat commercially prepared foods (whole grain cereals, nonfat salad
dressings, egg substitutes, fat-free baked goods, nonfat soups and chili.

Beware. These foods should be avoided as much as possible: Red meats, oils (all kinds, including margarine, and most salad dressings), nuts and seeds, dairy products that are not nonfat, alcohol, sugar (which often comes laced with fat), and any commercially prepared item with more than 2 grams of fat per serving. 

The IHP diet may sound rigorous (even impossible), but just as some
smokers quit cold turkey rather than slowly cutting back on cigarettes, many
people prefer it to less stringent changes.