The first year after we adopted our cat, we fed her the regular adult formula. But being an indoor cat, Persia began to pick up a couple of pounds and our vet suggested trying a light formula (in addition to more activity). Since we were already using Hill's Science Diet dry, we just picked up the Light formula and Persia continued to eat it without complaint.. I did notice that she didn't eat quite as much as she had previously, so maybe it isn't quite as tasty. But, she also didn't reject it completely so I knew she was getting the right amount of nutrition in a lighter formula. She didn't lose weight right away. However, when it was time for her next annual physical she had dropped a pound. Within 3 years she met her goal weight of 12.8 pounds and she's kept at that weight for 2 years now. All in all, I think this is a great choice for an indoor kitty who could stand to lose a couple of pounds.