A calorie is a calorie is a calorie, at least from a thermodynamic standpoint. It's defined as the amount of energy needed to raise the temperature of 1 kilogram of water by 1 degree Celsius (2.2 pounds by 1.8 degrees Fahrenheit).
But when it comes to health and your body's energy balance, not all calories are equal.
For example, some studies have reported that diets that are high-protein, low-carbohydrate, or a combination of the two do yield greater weight loss than diets with other levels of fat, protein, and carbs.
If every calorie in food were the same, you wouldn't expect to see weight-loss differences among people who eat the same number of calories that are doled out in different types of food.
Dietitians like me know there are many factors that influence what a calorie mea...
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