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This Is Why You're Fat: Review

This Is Why You’re Fat: How It Works

The This Is Why You're Fat diet is heavy on so-called "detox" foods like leafy greens, blueberries, and lemon water. These foods are supposed to change body chemistry and satisfy physical and emotional hungers, Warner says. She says that her plan "will help cleanse your liver and kidneys, allowing your body to excrete hormones efficiently."

The book maintains that the biggest reason people get fat is sugar, which Warner says "is evil, makes you fat, gives you wrinkles, kills your immune system, makes you stupid, and grows cancer."

The This Is Why You're Fat fitness routine focuses on interval cardio/weight lifting training, which aims to help you burn fat by increasing muscle mass and metabolic rate. But dieters are warned not to make the common mistake of letting their workouts serve as an excuse to overeat or eat junk food.

The book advises dieters to supplement the meal plan with omega-3 fatty acids, vitamin C, amino acids, creatine, conjugated linolenic acid, and a multi vitamin/mineral. This Is Why You're Fat also recommends herbs that are supposed to be liver-friendly.

This is Why You’re Fat: What the Experts Say

For the most part, the This Is Why You're Fat message on what to eat is a good one, says Lona Sandon, MS, RD, a spokeswoman for the American Dietetic Association. But there's little scientific evidence behind the book's claims about hormones, organs, detoxification, liver flushes, and more, she says.

"For starters, there is no such thing as fat-burning foods," says Sandon, an assistant professor at University of Texas, Southwest. "Some foods, like hot peppers, have a greater thermic effect -- but not enough to burn fat off your body."

Sandon also takes issue with the claim that certain foods or beverages can "detox" the body.

“Drinking plenty of water is a good thing, especially when it replaces higher-calorie beverages, but it won’t burn 75-100 calories," she says. "There is nothing magical about it, or the combination of foods, to detox the body or melt fat away."

Still, having lean protein at every meal and eating lots of high-fiber fruit, vegetables, and whole grains is a proven way to feel satisfied on fewer calories. Sandon says the eating plan's 1,500-1,800 calorie range is reasonable for weight loss for most people, especially if they also follow the workout plan.

Sandon notes that the eating plan is low in calcium, and suggests adding some servings of low-fat dairy. But she doesn’t agree with all the supplement recommendations; she says a daily multivitamin/multimineral pill should suffice.

Further, the diet's inclusion of two eggs daily exceeds the American Heart Association’s recommendation of one a day for healthy people. Anyone with heart disease or high cholesterol should avoid eating two eggs a day.

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