Candy, gum, toothpaste, baked goods, and some diet foods are sweetened with xylitol. Xylitol can cause an increase in the insulin circulating through your cat’s body, which will cause the cat’s blood sugar to drop. Xylitol can also lead to liver failure. Initial symptoms include vomiting, lethargy, and loss of coordination. The cat may have seizures soon after ingesting the xylitol, and liver failure can occur within just a few days.