The document discusses how healthy eating helps build muscle. It states that in addition to weight training, one must greatly increase their food intake and eat consistently every day to build muscle bulk and size, particularly for larger individuals. While gaining muscle requires sufficient exercise and calories, increasing calorie intake is necessary for the body to have enough energy to build muscle, even if it means initially gaining weight in the process. The key is balancing calorie intake and exercise to build muscle while adjusting diet as needed to achieve body composition goals.