“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 Mayo Clinic and medical editor in chief of The Mayo ClinicDiet, a guide to healthy weight loss. “You might be able to get away with it for a period of time, but the more restrictive (the diet) is — and the longer you follow it — the greater the risks.”
Crash diets are a tempting way to lose weight fast, Hensrud says. 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, because 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.”
The American Dietetic Association defines healthy weight loss as 1 to 2 pounds per week; for each pound you want to lose, you should consume 500 fewer calories a day — or burn them off through exercise. It’s no trick to shed far more than a couple of pounds each week, but you could run up some serious nutritional deficiencies: It’s hard to get enough calcium, vitamin D or iron on a radically reduced number of calories.
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 NBC’s “The Biggest Loser.” You can lose muscle mass — on near-starvation diets, the body starts to feed on protein for sustenance. And don’t be surprised if you’re more snappish: Irritability, depression and inability to handle everyday stress are travel companions of low-cal diets.
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 American Dietetic Association 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.”
Distributed by Tribune Media Services
1,000 calories per day
This is the point at which most short-term dieting becomes especially unhealthy, warns Donald Hensrud, chairman of preventive medicine at the Mayo Clinic. While dipping below that level is dangerous for anyone, the threshold for a particular person could be higher, depending on age, height, weight, activity level and body composition. Most 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.
No related posts.