Helping a cat gain weight can be important, especially if they've been sick or not eating well. Consider providing high-calorie cat food or adding wet food to their diet, as it's often more palatable. Sometimes, small, frequent meals can also encourage eating. Have you noticed any changes in your cat's eating habits or energy levels recently? It might be helpful to chat with a vet to rule out underlying issues. How is your cat's overall health and behavior these days?