"Diet foods for weight gain emphasize calorie- and nutrient-rich, high-protein selections to support both general weight gain and healthy muscle growth. Including foods high in heart-healthy fats, including nuts, seeds, and avocados, offers a concentrated calorie source. Lean meats, fish, eggs, and dairy products are among the foods high in protein that promote muscle growth. Whole grains, legumes, and starchy vegetables are examples of complex carbs that provide long-lasting energy and promote healthy weight gain. Consuming high-calorie snacks such as granola bars, nut butters, and dried fru