You've tried to lose weight. You've sampled lots of fad diets and exercise programs. You're committed to trimming pounds and inches, but it's beginning to seem like an impossible goal. And you're not alone. Even the prestigious New England Journal of Medicine admits that weight loss can be next to impossible. Current studies show that only 25% of the U.S. population can lose weight and keep it off. Do you suspect—or fear—that you're part of the other 75%? If so, there's help.

According to David L. Katz, author of The Way to Eat, there are four common obstacles to losing weight—use these strategies for keeping your waistline in check.