Wondering why you haven’t been able to reach your ideal weight? Well, according to the Centers for Disease Control (CDC), chances are you are not going about it the right way. While many people are exercising or watching what they eat, they are not doing both—and that’s the key to weight loss. The CDC recommends people exercise for 150 minutes a week and reduce their calorie intake. Controlling how much fat you eat is important for your heart health, but if you are trying to lose weight, you need to cut calories, too.