What food for a cat with a sensitive constitution?

[blabalalalablabla]

I have a rescue cat who has always had a bit of an upset tummy. He's constantly chewing grass and goes through periods of being sick every other day. he's fussy with food and the only wet food he'll eat is felix fish senior.

he's never had a particularly big appetite and seems to snack on and off. he only ever really seems to eat one meal and that is in the evening.

he was mistreated before he came to us and it's taken about seven years for him to enjoy being stroked and occasionally he'll come and sit on your lap - because he's been such an 'odd' cat we've never really been particularly worried about him, but as he's getting older (I estimate he's about 12 now?) I thought perhaps it might be good to change his diet?

is there any food that is specifically for cats with a sensitive tummy?
are cats better off with a dry diet?

[Listmaker]

We use Royal Canin Sensible which is for cats with sensitive guts - our rescue cat had problems for ages until a course of steriods finally sorted him out and now he's fine and we've stuck with this (dry) food all along. He does have a little bit of wet food too - Hi-Life sachet but that's just for normal adult cats.

[NoCarbsBeforeMarbs]

Mine (also rescue cat) has Royal Canin sensible too.
She has just dry food, but a bit of plain chicken as well on sundays.

[blabalalalablabla]

Thank you :)

[Lizcat]

I was also about to recommend Royal Canin Sensible too.

[blabalalalablabla]

have just bought a small packet to try out and they seem to be going down a treat :)

[NoCarbsBeforeMarbs]

Glad he's happy with it