When it comes to weight loss, there's no shortage of advice. Check any magazine rack or bookstore and you're bound to discover that latest and greatest cure for being overweight. Some even work — for a while.

Unfortunately, people often find diets hard to sustain, in part because they tire of avoiding certain foods, loading up on others or feeling deprived and hungry. And their diet is often temporary, something to endure for a while before returning to former ways. As a result, any lost pounds come right back once the diet stops.

Here's a summary of six common weight-loss strategies in circulation today, and the questions to ask yourself to determine if any of them will help you make the lifestyle changes required to maintain a healthy weight.

Cutting down on high-fat foods can help you cut down on your daily calories and thus help you lose weight. So why don't low-fat diets always work? Even a low-fat diet can lead to weight gain when people ignore the total amount of calories they're eating and regularly exceed their daily calorie goals. Too many calories from any source, low-fat foods included, can add pounds.

Followers of these eating plans believe that a decrease in carbs results in lower insulin levels, which causes the body to burn stored fat for energy. Some people do lose weight on low-carb diets, but the weight loss probably isn't related to blood sugar and insulin levels. It's more likely the result of eating fewer total calories, whether they're from carbohydrates, fats or proteins.

A low-carb diet doesn't appear to be any easier to maintain than other diets. Studies comparing low-carb diets and low-fat diets have found that after a year, people drop out of both diets at similar rates. This suggests that the low-carb diet, like so many diets, is no easier to stick to long term. Well-known low-carb diets include the Atkins diet, Zone diet and Protein Power.

The glycemic index ranks carbohydrate-containing foods based on their effects on blood sugar. Similar to the theory behind low-carb diets, most low-glycemic-index diets claim that lowering blood sugar levels leads to weight loss.

You may have difficulty following a diet that emphasizes only foods with a low-glycemic-index ranking. Many factors other than food influence your blood sugar level, including your age and weight, the type of food preparation, and the portion size. The South Beach diet is an example of a low-glycemic-index diet.

Meal replacements, such as Slim-Fast, provide less than 400 calories a meal and are nutritionally complete. You replace one or two meals a day, such as breakfast and lunch, with a low-calorie shake or meal bar. Then you eat a healthy third meal, between 600 and 700 calories, of your own choosing. For weight loss, meal replacements can be as effective as traditional calorie-controlled diets.

Some people have a difficult time knowing what they're supposed to eat. Busy schedules leave little time for meal preparation. In such cases, relying on ready-made meals eaten at home may deserve consideration. These services can be expensive. Jenny Craig and NutriSystem are two examples of meal providers.

You don't have to lose weight alone. Group programs, such as Weight Watchers, can support your efforts, giving you eating plans, exercise recommendations and support from others on the same dietary path. After joining, expect regular weigh-ins, group meetings and activity sessions.

How do you know if a weight-loss plan fits your needs and lifestyle? Ask yourself these questions. Does the program:

• Include various foods from the major food groups: fruits, vegetables, grains (particularly whole grains), low-fat dairy products, lean protein sources (meat, poultry, fish), nuts, seeds, and beans and other legumes?
• Include foods you like and that you would enjoy eating for a lifetime — not just for several weeks or months?
• Feature foods you can easily find in your local grocery store?
• Allow you to eat your favorite foods, or better yet, all foods?
• Fit your lifestyle and budget?
• Include proper amounts of nutrients and calories to help you lose weight safely and effectively?
• Encourage regular physical activity?

If you answer no to any of these questions, the weight-loss program isn't right for you, as you probably won't stay with it. Successful weight loss requires permanent changes to your eating and physical activity habits. This means you need to find a weight-loss strategy that you can embrace for life.