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You have a week to fit into that dress, and five pounds (OK, 10) to drop. The plan? If you were a Hollywood star, you might eat nothing but baby food or grapefruit until then, or forgo meals in favor of liquids. If you were Kim Kardashian, you'd probably prefer a QuickTrim detox formula. Or if you were Michelle Obama, you'd opt for a two-day vegetables-only "cleanse," as she calls the regimen in an interview in the September issue of
"People could eat nothing but jelly beans and if they were eating just a small amount, they would lose weight," says Donald Hensrud, chairman of preventive medicine at the
Crash diets are a tempting way to lose weight fast, says Hensrud. But most experts agree that they're not worth the risk. Just one week of overly restrictive dieting can cause serious nutritional deficiencies, alter your metabolism, and undercut your emotional well-being. And most crash diets only set you up to regain the weight, since you haven't made any long-term lifestyle changes.
"When people go on really rigid, low-calorie diets, they gain the weight back," says Katherine Tallmadge, a registered dietitian and author of "Diet Simple: 192 Mental Tricks, Substitutions, Habits and Inspirations." "Their plan backfires. You might lose weight through severe dieting, but you don't develop the habits you need to keep it off, like getting the right amount of exercise."
Short-term dieting becomes especially unhealthy below 1,000 calories a day, warns Hensrud. While dipping below that level is dangerous for anyone, the threshold for a particular person could be significantly higher, depending on age, height, weight, activity level, and body composition. The majority of women in their 30s and 40s, for example, need roughly 1,800 calories a day to stay healthy; for men in that age range, it's about 2,200.
You could permanently damage your organs by not providing them with sufficient working fuel. And--to be blunt--crash dieting could kill you if you lose too much fluid and your electrolytes go out of whack, says Hensrud, who has treated several short-term dieters who were hospitalized for dehydration. One of them had alarmingly low levels of potassium, sodium, and other vital electrolytes, which could cause muscle cramps, dizziness, fainting, or even a heart attack.
Even if a crash diet puts smaller numbers on the scale, the weight loss may be illusory or harmful. The first few pounds to go are usually water, and they inevitably return, says Cheryl Forberg, staff nutritionist for
There is a healthy way to shed a few pounds fast, merely by bumping up physical activity and making minor diet adjustments. Try eliminating processed foods, which can cause bloating if they're loaded with sodium, and minimize overall salt intake to prevent water gain.
Pig out on fruits and vegetables--especially asparagus, a natural diuretic that will help flush your body of toxins while breaking down fat, says ADA spokesman Jim White, a dietitian in Virginia Beach, Va. You should see a difference within a week. Avoid one-food plans, like cabbage soup, baby food, or vegetable-only diets, say experts. White worked with a client who spent six months on a nothing-but-watermelon diet, which he calls a sure route to malnutrition.
Bottom line: Crash diets are a quick but deceptive fix. "They patch things up instead of addressing the larger issues: cutting down portions, eating five or six meals a day to speed up your metabolism, and getting a variety of foods," White says. "If you need to look good for a wedding or class reunion, do yourself a favor and plan ahead."
Available at Amazon.com:
The Flexitarian Diet: The Mostly Vegetarian Way to Lose Weight, Be Healthier, Prevent Disease, and Add Years to Your Life
Wellbeing: The Five Essential Elements
Healthy Travel: Don't Travel Without It!
The Good Doctor's Guide to Colds and Flu
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Health - Can Crash Diets Be a Good Way to Lose Weight?