What Happens If a Cat Gets No Sunlight?

A cat with no sunlight faces several health issues. Lack of light easily causes vitamin D deficiency and then calcium lack, leading to poor bone growth, osteoporosis, and fractures. It can also lower immunity, making the cat prone to illness, especially skin and digestive problems. Sun helps regulate the body clock and mood; without it the cat may show mood swings and odd behavior and poor sleep.