1. Supplement protein: protein is the key nutrient for muscle growth and repair. Fitness people will destroy muscle tissue through exercise, and taking enough protein will help muscle repair and growth. Protein powder is a convenient and quick way to supplement protein.

2. Improve sports performance: protein has an important influence on athletes' physical fitness, strength and endurance. Adequate intake of protein can help athletes maintain a high level of performance in training and competition.

3. Help to reduce fat: protein can increase satiety, help to control appetite, and thus help to reduce fat. At the same time, protein also plays an important role in maintaining normal blood sugar level and hormone balance.

4. Promote muscle growth: protein is the foundation of muscle growth, and adequate intake of protein will help to increase muscle mass, increase basal metabolic rate and make the body more compact.

5. Portable: Protein powder is a portable nutritional supplement, and bodybuilders can supplement protein anytime and anywhere, which is very suitable for the busy pace of life.

In a word, bodybuilders eat protein powder mainly to supplement protein, improve sports performance, help reduce fat, promote muscle growth, and make it easy to carry. Of course, protein powder can not completely replace a balanced diet, but should be combined with a healthy diet and exercise.