Of course, not all carbohydrates are equal. In short, fast-digesting carbs tend to create a large insulin burst, leading to more potential fat gain. These carbs include white bread, most cold cereals, any sweets, rice cakes, white rice, and white potatoes. Conversely, slow-digesting carbs (found in whole-grain breads, oatmeal, sweet potatoes, and legumes) don't cause much of an insulin rise, so these should make up the vast majority of your carb consumption.

The prevailing formula for a long time on how much fat you’re going to burn was calories in minus calories out, based on your basal metabolic rate (BMR) and exercise efforts, explains strength and performance specialist Joel Seedman, Ph.D., owner of Advanced Human Performance in Atlanta. But with all the different biochemical reactions in the body, hormonal response, and endocrine function, there are an infinite number of factors that can affect how your body is storing and breaking down calories.

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