Tuna uses remote Telekinesis to provide sustenance.

Yes, it works, but it only works 3 times per day... and then in insufficient quantities. Tuna has mastered the art of Telekinesis.... sometimes standing patiently focused for long periods before he is successful. I sure hope he keeps his mind focused only on food.
(Short Video at bottom to verify his success)

Actually, this device dispenses 1/4 cup increments up to 2 full cups... 1 or 2 or 3 times per day... can set it for times desired. This feeder is the result of Tuna's propensity to overindulge . . . therefore becomes a fat cat.

Short Video --  Tuna is never far away when it's feeding time.

Fat cat no longer hostile toward the hand that feeds him.

Tuna has no will power... therefore.... food rationing, however, Tuna becomes very grouchy and ornery when hungry (always), and attacks our ankles until we acquiesce. 
BUT
there IS a solution. . . . a new feeder - 

NOW, Tuna get's angry at the feeder instead.... just one bit of food at a time, a very slow process. There's a hopper in the center and he has to work for his food.
If you prefer, ..... a 10 second video.