Can a cat eat one egg yolk every day?

A cat should not eat one egg yolk every day. Yolk is rich in protein, fat, and minerals that appropriately supplement nutrition, but it is also high in cholesterol that heavily burdens the liver if overfed. Its palatability can lead to picky eating and loss of interest in cat food, and once a cat is picky it is hard to correct.

Therefore, do not feed yolk daily or long-term; treat it as a snack 1-2 times per week.