We have a male neutered cat (moggy) aged about 11/12 who we got from a rescue when he was about 6 months old. He's always been vocal and very food driven, we think he was possibly from a feral or farm litter and was hungry as a very young cat. Now though he is driving us mad, we feed him, he wolfs it down and if we walk out to where his food is he races after us miaowing his head off for more food. This is constant. As soon as a human appears he runs about frantic yelling for food no matter when he was last fed. He cannot sit and relax with us now, just paces about miaowing.
He gets 3 pouches a day and is up to date with wormer. No weight loss and he doesn't drink much (has water but doesn't drink it).
Is this feline dementia? No other obvious symptoms.