We've all heard the adage: "An apple a day keeps the doctor away," but is there any truth to this fruit's cure-all reputation? Thanks to its high fiber content, maybe.

One mistake people make when trying to lose weight is skimping on fiber -- an essential nutrient that prevents blood sugar spikes and overeating. "Both [apples and pears] contain fiber, especially pectin, which is a soluble fiber that can help promote satiety and fullness and curb hunger," Angelone says. Unlike that bag of chips you mindlessly munch in front of "America's Next Top Model" reruns, fiber-rich apples or pears will keep you fuller longer, and therefore, are some of the best fat burning foods.

When you're noshing on these white-fleshed fruits, you don't run the risk of a sugar crash. As your body slowly digests the fiber, it slowly digests the sugar. When you consume something lacking fiber (like a soda), sugar absorbs quickly and goes straight to your liver, pushing your liver into overdrive (aka a sugar spike). To help the liver out, the pancreas begins to produce the insulin hormone, which expedites the sugar for energy or turns it directly into fat for energy storage. Yikes. This goes to show that not all calories are created equal (think: a 100-calorie apple is much better for your body than a 100-calorie soda).

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Though berries be but little, they are fierce. Raspberries, blackberries and strawberries are all high in fiber and low in sugar -- but that's not all to these fat burning foods. "They can help increase the expression of adiponectin, a hormone recreated by fat cells that helps stabilize blood glucose [blood sugar], suppress appetite and increase metabolism," Angelone says.

A study conducted by the University of Pennsylvania School of Medicine found that in mice, adiponectin spiked metabolism, causing the critters to burn more heat and lose body fat over time -- even though their food intake remained the same. So grab a handful of berries each day, and watch your love handles slowly melt away (well, provided the rest of your diet and exercise is on point, of course).

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To rock a smoking hot bod you've got to keep your food hot too. What's one major cause for obesity? The obvious: overeating. But you can keep yourself from going back for seconds (or thirds) by adding natural fat burners, like hot red peppers to your plate, according to Angelone.

"Capsaicin, the compound that gives peppers their heat can help reduce hunger and increase metabolism," Angelone explains. "However, you need to eat the actual pepper and feel the burn. Capsules won't do the trick." It behooves you to break a sweat outside of the gym too, according to Angelone. "Spicy foods enhance and prolong the thermic effect of food, aka the increased calories burned just from eating that food," she says. Meals made with chili and mustard may increase the metabolic rate up to 33 percent more than an un-spiced meal would, and this effect may last as long as three hours, according to "Krause's Food and Nutrition Care Process." Good thing it's chili season.

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Okay, so tea isn't technically a food that burns fat, but it definitely deserves a spot on our list of fat-torchers.

Teas like black, green and oolong are calorie-free and high in antioxidants called flavonoids, which come with serious anti-inflammatory and immune system benefits, according to Angelone. "These compounds help increase metabolic rate, increase fat oxidation (fat burning) and improve insulin sensitivity," she says. Remember, managing those insulin levels (aka blood sugar levels) prevents the body from converting and storing sugars into fat, and a cup of tea not only helps prevent your body from storing more fat, it aids in torching unwanted fat in the process. Simply sip throughout the day. Pinkies out.

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One of the most common errors people make when trying to lose weight is forgetting to pile on the protein. "Protein increases satiety more than fiber, fat or carbs," Angelone says. And packing a whopping 22 grams of protein, Greek yogurt is a great choice -- especially in the morning.

But keep in mind not all yogurts are created equal, when it comes to foods that help burn fat.. "Greek yogurt is higher in protein than regular yogurt and is one of the highest foods in protein for the fewest calories," Angelone says. It also contains about half as much sugar as regular yogurt. So skip the sugar spike (which contributes to fat storage) and reach for plain Greek yogurt the next time you're in the dairy aisle. You can always add a touch of honey or some berries (another food that burns fat) to satisfy your sweet tooth.

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