To gain weight, you will need to consume more calories than your body burns. This can be achieved by eating a diet that is high in calories and nutritious foods, such as fruits, vegetables, whole grains, lean protein, and healthy fats. It is also important to exercise regularly to maintain muscle mass and support overall health. However, it is important to avoid gaining too much weight too quickly, as this can increase your risk of developing health problems, such as obesity, diabetes, and heart disease. It is also important to consult a healthcare provider or registered dietitian before making any significant changes to your diet or exercise routine.