Why Diets Fail

Inevitably, though, diets do—and most likely will—fail. Consider, after all, how many times you've been in this situation. You go gangbusters on one diet only to fizzle out after a few weeks. Then slowly but surely, the weight you've lost creeps back onto your body. What went wrong? And Why?

Research backs this point. A study of four popular weight loss diets—the Ornish, Zone, Atkins, and Weight Watchers—found that all led to modest weight loss when followed. But sticking with the diets wasn’t easy, with 42% of dieters dropping out before the end of the study. Why do diets fail? Diets often don't work because they're simply temporary interventions.

Why do diets fail? "Diets fail to address the eating behaviors and lifestyle factors that cause people to gain weight," Rick says. Why do diets fail? Most diets, for instance, prescribe certain eating habits that you follow for a specific period. Yet once that period ends, you're left to battle with your old eating patterns.

Although you may have lost weight, you didn't learn anything about nutrition, nor were you taught how to modify your old eating habits to maintain the weight you've achieved.

Why do diets fail? Many diets are also too restrictive or unrealistic, Wein says. "Someone may be eating so few calories that they just can't function well," she explains. Or the diet may require giving up going out to eat with friends or even eating certain food groups.

How to Spot a Healthy Diet

So how can you choose a diet that will help you lose weight sensibly and keep it off? By taking the time to evaluate diets and not believing every claim you read or hear. Before you start a diet, Rick advocates talking to your doctor about your intentions. Then ask these questions when analyzing a diet:

1. Who is the author of the diet?Make sure that the author has credentials to back his or her expertise, Rick says. Even if a diet book is written by a doctor, find out that doctor's area of interest and look for motivating factors that might have prompted him or her to write the book.

2. Are the diet's claims backed by research?Do some digging to find out whether research has been performed, preferably at the university level, Wein says.

3. What are the health risks associated with this diet?"If a diet doesn't explain side effects or possible health risks," Rick says, "then run from it."

4. Are all food groups represented in the diet?"If you cut out a whole food group," Wein says, "you miss out on valuable nutrients." Without the right balance of nutrients, you'll feel sluggish and will perform poorly throughout the day.

5. Does the diet severely restrict calories?Severe caloric restriction should send up a red flag, Wein says. Women who are exercising regularly require a minimum of 1,600 daily calories, she says. Active men require at least 2,000 calories every day.

6. Does the diet recommend something other than high carbohydrate, moderate protein, and low fat intake?If so, consider finding another diet. Carbohydrates have received a bad rap lately for no reason, Wein says. "Our bodies and brain rely on carbohydrates for energy," she says. Take in too few carbohydrates and you'll feel drained. On the other hand, eat too much protein and you'll wind up fighting dehydration, exhaustion, calcium excretion, and other health problems.

7. Does the diet claim that weight loss will be immediate?Remember that slow and steady sheds the weight; focus on losing only one to two pounds per week.

8. Does the diet reveal how many pounds the average person loses?Before and after photographs can be enticing but deceiving. "Because the weight loss industry is largely unregulated, buyers should beware," Rick says, adding that most of these appealing photographs don't represent average weight loss.

9. Does the diet encourage exercise?Exercise is a vital part of weight loss and management and should at least be recommended.

10. Does the diet propose a maintenance plan once you've lost weight?"Getting weight off is the easy part," Rick says. "Keeping it off is the hard part." Without a weight maintenance plan, there's a greater chance that you'll gain the weight back.

A Life Change, Not a Quick Fix

As Wein is quick to point out, there is no quick fix and no magic pill or supplement that will make you lose weight. ""The bottom line is that to lose weight," she says, "you have to eat well and exercise."

Once you do that, you're on your way to a lifetime of weight management, not yo-yo dieting. "Just like riding a bike," Rick says, "the longer you manage your weight, the easier it becomes."

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