Vomiting after eating

Hey all! I have a friend with a kitty that is vomiting immediately after eating. He doesn't eat much, and none of it is digested. Also, form what she says, it is not 100% of the time but is occurring more and more frequently. I do not know exactly how old the he is, but I want to say between 7-10 years & is just your regular cat, no fancy breeding. He is an indoor cat, and lives in a house with one other cat. Also, he is obese but she has had him on a diet for the last year on strict orders from the vet. He has lost a little bit of weight, but I am not sure if it is from the diet or the vomiting itself. Lastly, he acts perfectly normal otherwise, and is still wanting to eat. She plans to take him to the vet, but wants to know what she could possibly be dealing with before taking him in. Does anybody have any ideas?

He's regurgitating not vomiting. Slight difference. Let me guess.... He's being fed dry kibble. Right? On strict orders from the vet who is probably selling the food no doubt.

Her other kitty just had a severe UTI and had to stay at the vet's office for a couple of days. While there, the vet switched him to a diet to help him manage that easier and told her to switch this kitty (named Scamper) to the diet as well. Since he isn't my cat, I cannot call specifics but I think this all happened right around the first of August. You think it could be related to the switch in food?

I think she is dealing with an obese cat on an improper diet.

Dry food tends to swell when it comes into contact with any liquid. This is why it is sometimes prescribed for over weight cats, it swells in their stomach and makes them think they are full, therefor they eat less. However, if the cat eats too quickly the food may cause him to vomit as it swells. Could this be what is happening with your friend's cat?

That could be. Should she be mixing it with a little bit of wet food? Or soaking it in water before so it is already expanding? Any ideas would be welcome. I know she would appreciate it!!

Soaking dry food in water isn't a good idea because it cause bacteria to multiply and the food will start to rot.

Did the vet prescribe dry food for her cat? Diets to help control UTI will be different from weight loss diets. I'm not a big fan of prescription diets myself, I think vets are often under pressure to recommend them even though they're not the healthiest option. Generally speaking wet food is much better than dry food, especially if you want your cat to lose weight. I'm not sure what is available in the US, maybe other members can suggest something.

I guess her vet will check for a blockage, as regurgitating right after eating can be a sign of this.

Let us know how it goes at the vet.