And this is on the
obesity site and the portion highlighted, italicized and bold is the basic math formula to start with on an average-size cat (Not suggesting Oren lose any weight, at all - but it's where the caloric equation is found):
How Much Should I Feed?
I cannot stress this enough - I can give you a formula that will provide an
approximation of the optimal caloric intake for a safe weight-loss program but the bottom line is that you need to
weigh your cat every 3-4 days to make sure that he is not losing weight too rapidly - or not losing weight at all.
Why is weighing your cat so important? Because:
1) Every cat is different in terms of how they metabolize food and their caloric needs.
2) We have no way of knowing if the calorie information given out by the pet food companies is accurate.
Also, as stated above, it is very important to pay attention to your cat's top line (back bone area) and the back of his head for signs of excessive loss of muscle mass.
There are three ways to arrive at a starting figure for the amount of calories to be fed.
First method:
The most accurate way is to calculate how many calories your cat is currently eating to maintain his not-so-svelte figure. Then take 80% of those calories as a starting point. Check the bag of dry food that you are feeding and see if it lists the calories/cup. Most dry foods do list the calorie content on the bag but canned foods do not. See the
Cat Food Composition chart to see if the canned food that you are currently feeding is listed.
Second method:
Since most people free-feed dry food, the amount of calories consumed in a day is not known. In this case, figure out what you think your cat *should* weigh and plug that number into this formula:
Required calories per day = [13.6 X optimal lean body weight in pounds] + 70
Most female cats should weigh a nice, lean 10 -11 pounds.
Most male cats should fall into the 11 -13 pound range.
Using an optimal body weight of 12 pounds as an example, we come up with 233 calories/day as a starting point.
[13.6 X 12 pounds] + 70 = 233
This formula provides a very generous starting point (
usually far too generous) so be aware that some (most) cats will not lose weight when eating the number of calories generated by this formula. I would suggest feeding according to this formula for 10--14 days (or less) and then re-evaluating the caloric needs based on the cat's weight loss, or lack thereof.