I suggest you change your staple food for a while, because it is not necessarily cat food, but the poor nutrition absorption caused by the cat's constitution. Also, when changing food, you should always pay attention to your cat's situation and see if other cat foods will cause discomfort to the cat's stomach. In fact, when my cat first came to my house, her stomach was not very good. A hairtail cat food recommended by a friend has intestinal protection for deep-sea fish. I feel much better after eating it for a while. Later, my cat was selected by sea and land fish, and now its coat color is better. The key is to gain a lot of weight. Of course, I'm not saying that this cat food is necessarily suitable for your cat, but considering the actual situation of my cat, I recommend you to try it!