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Myth #1: Calories Fuel Our Bodies

Actually, they don't.

A calorie is simply a unit of measurement for heat; in the early 19th century, it was used to explain the theory of heat conservation and steam engines. The term entered the food world around 1890, when the USDA appropriated it for a report on nutrition. Specifically, a calorie was defined as the unit of heat required to raise 1 gram of water 1 degree Celsius.

To apply this concept to foods like sandwiches, scientists used to set food on fire (really!) and then gauge how well the flaming sample warmed a water bath. The warmer the water, the more calories the food contained. (Today, a food's calorie count is estimated from its carbohydrate, protein, and fat content.) In the calorie's leap to nutrition, its definition evolved. The calorie we now see cited on nutrition labels is the amount of heat required to raise 1 kilogram of water by 1 degree Celsius.

Here's the problem: Your body isn't a steam engine. Instead of heat, it runs on chemical energy, fueled by the oxidation of carbohydrates, fat, and protein that occurs in your cells' mitochondria. "You could say mitochondria are like small power plants," says Maciej Buchowski, Ph.D., a research professor of medicine at Vanderbilt University medical center. "Instead of one central plant, you have several billion, so it's more efficient."

Your move:

Track carbohydrates, fats, and protein—not just calories—when you're evaluating foods.


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Myth #3: A Calorie Ingested is a Calorie Digested

It's not that simple.

Just because the food is swallowed doesn't mean it will be digested. It passes through your stomach and then reaches your small intestine, which slurps up all the nutrients it can through its spongy walls. But 5 to 10 percent of calories slide through unabsorbed. Fat digestion is relatively efficient—fat easily enters your intestinal walls. As for protein, animal sources are more digestible than plant sources, so a top sirloin's protein will be better absorbed than tofu's.

Different carbs are processed at different rates, too: Glucose and starch are rapidly absorbed, while fiber dawdles in the digestive tract. In fact, the insoluble fiber in some complex carbs, such as that in vegetables and whole grains, tends to block the absorption of other calories. "With a very high-fiber diet, say 60 grams a day, you might lose as much as 20 percent of the calories you consume," says Wanda Howell, Ph.D., a professor of nutritional sciences at the University of Arizona.

So a useful measure of calories is difficult. A lab technician might find that a piece of rock candy and a piece of broccoli have the same number of calories. But in action, the broccoli's fiber ensures that the vegetable contributes less energy. A study in the Journal of Nutrition found that a high-fiber diet leaves roughly twice as many calories undigested as a low-fiber diet does. And fewer calories means less flab.

Your move:

Aim to consume at least 35 to 40 grams of fiber every day. That being said, not all fiber is created equal.


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Myth #5: Low-Calories Foods Help You Lose Weight

Not always.

Processed low-calorie foods can be weak allies in the weight-loss war. Take sugar-free foods. Omitting sugar is perhaps the easiest way to cut calories. But food manufacturers generally replace those sugars with calorie-free sweeteners, such as sucralose or aspartame. And artificial sweeteners can backfire. One University of Texas study found that consuming as few as three diet sodas a week increases a person's risk of obesity by more than 40 percent. And in a 2008 Purdue study, rats that ate artificially sweetened yogurt took in more calories at subsequent meals, resulting in more flab. The theory is that the promise of sugar—without the caloric payoff—may actually lead to overeating.

"Too many people are counting calories instead of focusing on the content of food," says Alderman. "This just misses the boat."

Your move:

Avoid artificial sweeteners and load up your plate with the bona fide low-calorie saviors: fruits and vegetables.


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