Answer: First remember if you’re not losing weight/fat, you are NOT in a deficit, regardless of your calculations. Our experience working with thousands of clients is that people are eating more than they think they are. Weight loss is determined by calories. If your weight has been stable for more than three weeks, you’re eating about the same number of calories as you’re burning. The solution is to step up your activity level, cut calories or both. You’ll eventually lose weight if you’re consistently burning more than you’re eating. How fast you lose is determined by your calorie deficit, the difference between your daily burn and intake. For example, if you burn an average of 500 more calories than you eat daily, you’ll lose one pound a week. (3,500 calories = 1 lb of fat). If you burn 250 calories more than you eat you’ll lose half a pound a week, or two pounds a month. Numerous research studies have confirmed that people underestimate how much they eat by up to 50 percent. In one study, young adults misjudged their intake by 1,000 calories! Large portions, restaurant meals, social occasions, alcohol intake and even the size of your plate will cause you to eat more without noticing. Read "How You May Be Sabotaging Your Weight" and "Weight Control 101" for more in-depth information.