Things to note when a cat's cheeks are puffing up:
1. Feed them more meat. Cats need a lot of nutrition, including protein and animal fat, but they also need a balanced diet.
2. Regularly deworm your cat to prevent parasites from affecting its cheek development.
3. Appropriate exercise is important; it helps keep your cat healthy and also promotes cheek development. 
Reasons for a cat's cheeks becoming puffy:
1. The most fundamental reason is that only cats with the gene for wide cheeks can achieve this, such as the British Shorthair, American Shorthair, and Ragdoll, which are born with this gene.
2. After a male cat is neutered, its male hormones will disappear, and then over time, it will gradually gain fat, and its cheeks will also enlarge.
