3) Pumpkin. You may know this vegetable for its central role in Thanksgiving celebrations, but it's also one of the greatest weight-loss foods ever. Plain old canned pumpkin is absolutely loaded with fiber and has a mere 40 calories. Dozens of studies confirm that high fiber intake is associated with a host of health benefits, including weight management. Pumpkin is also among the easiest food in the world to prepare. You can sweeten it with your favorite low or 0-calorie sweetener, sprinkle it with blood-sugar-lowering cinnamon and nutmeg for good measure, throw in some healthy almonds and make it one of the best tasting weight-loss treats around. It's filling and delicious.

4) Grass-Fed Beef. Meat is a great diet food -- if it doesn't contain antibiotics, steroids and hormones. Eat grass-fed beef and avoid the health concerns that go along with eating meat while getting all the terrific benefits. Buffalo burgers are a good alternative if you can't find grass-fed beef. High-protein diets are associated with weight loss for a variety of reasons: Protein stimulates metabolism, helps you feel full longer and helps decrease the desire to overeat. Grass-fed beef has a high omega-3 content, giving you multiple health benefits into the bargain.

5) Green Tea. This natural weight-loss stimulant might not be a food, but green tea is still a great slimming solution, not to mention that it's rich in antioxidants, promotes heart health, aids digestion and regulates blood sugar and body temperature. It raises the metabolic rate and speeds up fat oxidation, thus helping people lose weight. Drink it daily to boost your metabolism. Some research has shown that five cups a day is the magic number for fat loss. As an added benefit, the theanine in green tea is also a great natural de-stressor.