Fat metabolism is the most efficient way to produce energy, allowing you to go and go and go without burning through a ton of calories. But efficiency is the enemy of fat loss. To lose body fat, you want to churn through calories—calories from carbs, calories from fat, calories from anything—and you get there through carb metabolism. “The more energy-demanding the work, the more likely you are to lose body fat,” Zimmerman explains.

In a way, moderate-intensity physical activity is that "magic pill" a lot of people are looking for, because the health benefits go beyond keeping your waistline trim: Not only can it reduce your risk of cancer, stroke, diabetes and heart attacks, but studies have shown that physical activity can significantly improve the moods of patients with major depressive disorders.

Changes are hard, but they’re easier if you have some tools at your side to help you. And hey, if you mess up one day, it’s not over. Pick up the next day where you left off. If you fall off for three weeks, it’s still not over. Again, pick up right where you left off. Be kind to yourself and practice forgiveness. Instead of harping on what you haven’t done, look at what you have accomplished.
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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