Why orange cats are prone to obesity:
1. Genetic evidence shows that about 2/3 of orange cats are male. Male cats are fat, so people think that orange cats are all fat.
2. Male cats tend to have rounder faces, and they are more likely to gain weight after being spayed or neutered.
3. Orange is the most common color for cats. Generally speaking, domestic cats are relatively fat, and many domestic cats are orange, so people will think that orange cats are fat. 
How to prevent orange cats from becoming obese:
1. Feed your orange cat small, frequent meals. Orange cats are big eaters, and if you don't control their eating schedule and portion sizes, they will become obese.
2. Ensure your orange cat gets adequate and moderate exercise daily. Orange cats tend to eat a lot but don't move much, and their digestive system is particularly efficient, so they will naturally gain weight over time. Owners should take their cats out for exercise regularly to boost their immunity.
