Lose Weight With This Simple 7-Day Diet Plan Losing weight and sustaining weight lost isn’t easy at all. Along with regular exercising, you should definitely keep an eye on the foods you are eating. If you’re trying to lose weight, first start with a balanced diet that contain around 1500 calories to keep your energy levels up and build lean muscle. Remember, the diet should be consists of 40% whole, fiber-rich carbs, 30% protein, and 30% healthy fats.