Should I Be Worried?

Ive recently switched my girls from Purina cat chow to taste of the wild Rocky Mountain dry formula. It seemed to go great, even though they aren’t crazy about the new food. I mean who would be, going to a somewhat healthier food. I’ll admit I was ignorant about cat nutrition and free fed my cats purina cat chow.... my cats are overweight from that. I’ve noticed on TOTW, my cats have more energy and they have softer coats, shed less... I’m only concerned because even after I’ve slowly transitioned to TOTW dry food, I’ve been giving them 3/4 a cup every day in a bowl upstairs and downstairs. When I go to fill the bowls the next morning, the average is they eat 1/4 a cup from each bowl per day, I can’t tell what cat is eating more or less. my Cats seem to be dropping weight, idk if it’s them not eating enough, or being more active? Benny gets canned food so I’m not as worried about her, but Cookie doesn’t eat canned food, only fancy feast broths/delectables, and those are complementary to a cats diet. Her belly is starting to become flabby and she has more definition in her flanks. They’ve been switched for about a month. I’ve her cats can develop fatty liver by refusing to eat. Am I just being a worry wart?

I have 2 cats, for reference

Hi - me again It might be that the calorie count is less. If it were me, (granted my boy is 13 so I'm paranoid about any weight loss) I'd keep an eye on things to try and stop the weight loss. Here are a couple of methods, and the idea is that you want to be able to feel a thin layer over the cats' ribs.
Also, fatty liver occurs after a cat, especially an obese cat, doesn't eat for a few days.
Healthy Weight Calculator | petMD
NUTRITIONAL CALCULATOR FOR CATS

you are not being a worry wart. It is good for overweight cats to loose weight, but it needs to be very slow. And you do want her to eat enough each day so she doesn't get sick! Is there any way to tell about how much she is eating? If you can figure that out it would help. You may need to meal feed them for a bit and see? I free feed dry too, but all of my guys eat wet twice a day, so i can tell who is eating like normal. And i keep the dry food where i can see who is visiting the bowl, at least when i am home. hopefully she is eating enough, but i would do my best to get an estimate.

I actually had the same situation as you. I was feed the Purina Indoor Cat Chow, with one super overweight cat (17.5 lbs) and one perfectly fit cat (10 lbs). We switched kibble and our overweight cat, Trin, got way more energetic and stopped binge-eating when he was upset. He is now at 14.5 lbs 3 years later, so he was losing about 1 lb per year. He definitely ate less food overall, but was obviously getting more energy from it.

I say speak with your vet and make sure that the weight loss isn't too quick. Also, try and weigh your cats periodically so you see how much they are changing. You can do this by standing on a human scale with them and subtracting off your weight. Then you can see if the loss is too fast.

Also, it's great that you are researching feline nutrition and upgrading the food! I went through the same transition and I think the kitties are much happier and healthier for it!