Eating more lean meat won't be a problem. Protein and a small amount of fat in lean meat are very helpful for muscle growth after fitness. There is no need to control the amount of food, mainly the ingredients consumed.
First of all, be careful not to eat high-fat and high-calorie foods, but also to eat carbohydrates and protein, but don't eat too much carbohydrates. Then, if possible, eat as many meals as possible, and eat three meals separately at ordinary times to help prevent fat accumulation.