A 3500 Calorie Deficit = Approximately 1 Pound of Weight Loss. If you are trying to lose weight through calorie counting, you will need to know how many calories it will take to lose a pound of weight. Creating a calorie deficit of about 3500 calories should result in about 1 pound of weight loss. That is, if you consume 3500 calories less than you burn over a given period of time, you should lose around 1 lb of weight. To get an idea of how many calories you burn, take a look at our article on how many calories do I burn in a day.
My mother's cat went into Congestive heart failure about a year and a half ago and she is still with us. There are a fair number of us on here that have dealt with cats with this condition. Please do not hesitate to start a thread of your own if you have any questions or just need some support.
Not very long. Young kittens can die within 24 or 48 hours without food or water. Older kittens will survive a little longer than this as they are bigger and have bodily reserves. If your kitten stops eating for 24 hours, it is highly recommended to take it to the vets.