It is not advisable to gain a substantial amount of weight in 7–10 days because there could be health hazards involved and the effects might not last. On the other hand, concentrate on eating calorie-dense foods like nuts, nut butter, dried fruits, and whole milk if quick weight gain is required for certain reasons. Aim for at least 500–1000 extra calories per day over maintenance by increasing meal portions and frequency. Incorporate foods high in protein to help build muscle and strength training activities to promote muscle growth. For the best healing, emphasize relaxation and drink enough of water. For individualized advice and safety, speaking with a nutritionist or medical professional is advised.