Just don't forget that any weight loss program in cats should be overseen by a veterinarian. It can be very hard to tell when your cat has lost weight and if they lose weight too fast they are at risk of fatty liver disease. Levi lost 4 lbs and I didn't even notice . Luckily, this was spaced over about 8 months, so this is an acceptable amount of weight loss. Cats should be weighed on an accurate scale once a month, and they should not be losing much more than 1/2 lb a month, otherwise they are losing too fast.