This article provides a comprehensive guide on weight gain, including the science behind gaining weight, how to determine your caloric needs, and the top foods and exercises for building muscle and gaining weight. Additionally, it covers the importance of protein and healthy fats for weight gain, and how to create a meal plan for weight gain. Finally, the article concludes with tips for gaining weight and building muscle without gaining fat, including tracking progress and being patient with the process. By following these tips and guidelines, readers will be equipped with the knowledge and tools they need to successfully gain weight and build muscle in a healthy and sustainable way.