Cats will absorb nutrients from their internal organs after not eating for 3 days: kittens will starve to death in about a week if they don’t eat or drink for more than 3 days, and adult cats will starve to death if they don’t eat or drink for more than 5 days. They will starve to death in about 2 weeks. In addition, cats with good physical fitness will live a few more days. If the cat at home is sick and refuses to eat, the owner can make liquid food and feed the pet through a syringe.