Cutting is a term used in bodybuilding to describe a phase of training where the goal is to reduce body fat while maintaining muscle mass. It is usually done before a major workout regimen or competition and involves a weight loss diet that is meant to maintain as much muscle as possible. A cutting diet involves calculating calorie, protein, fat, and carb needs to reduce body fat and maintain muscle mass. It is usually paired with weightlifting and lasts 2-4 months, depending on how lean the person is before dieting. The key to a successful cut is to create a calorie deficit by reducing energy intake, while still consuming enough protein to maintain muscle mass. It is important to regulate energy intake in such a way that the loss of muscle mass is minimal. Cardio can also be added to support fat loss, but it should be gradually increased over time. Cutting is usually followed by a bulking phase to build muscle and gain weight.