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.
It depends on the body condition of the cat itself. For example, an obese cat will succumb much sooner to HL than a young, skinny cat. The average range of days without food for this disease to become fatal may vary from two to ten days. If a cat survives, it's very likely to have organ damage as a result. Be aware, though, that not all obese cats that go without food will develop HL, and not all cats who get HL are obese.