my cat needs to put weight on, any advice ?

My 3 year old male cat has lost some weight, he is healthy in all other ways, I would just like some advice on what high calorie foods i could give him to fatten him up a bit, thanks .

Welcome to the cat site, Ruby 111!

I'd probably suggest checking out the food chart on catinfo.org: it's here.   Some of the information is a little outdated and the chart is huge and a bit overwhelming but the column on the far right shows calories so you can compare various canned foods. You can also compare protein, carb, and fat calories in each food so you can be sure you're giving your cat protein calories rather than emptier carb calories.

Good luck!