When you say eat, you should want to gain muscle. Eating is too vague. Let's just say that when you don't exercise, your eating habits are balanced. If it remains the same, there is basically no hope of gaining muscle. The muscle was eaten. Training is just a signal to the muscles. Excessive recovery after slight tearing of muscles is mainly manifested in eating. But since I am a novice and lack of exercise, even if the muscle latitude remains unchanged after exercise, my strength will increase greatly within one month, at least 30% or more, because my nerves can mobilize more muscles at the same time. People who lack exercise can only mobilize 40-50% of their muscles at the same time, and athletes can reach about 90%.