If you seem to have more than an inch to pinch on your waist no matter what you eat or whether you focus on intervals or weight training, the problem may not be your stomach but another organ.

You probably don't give much thought to your liver (except maybe when you contemplate that third vodka soda), but its health is key to your overall health and weight. Your liver is the ultimate multitasker: It acts as a filter to remove toxins (like medications and alcohol) and nutrient byproducts such as ammonia from the blood; it aids in digestion by producing bile to help break down fat and absorb fat and water-soluble vitamins and minerals; and it plays a part in regulating glucose, blood pressure, blood sugar, insulin, estrogen, testosterone, immunity, and blood cholesterol production and removal. And you thought you had a long to-do list!