My girl has hyperthyroidism which was picked up as she'd lost a lot of weight and was eating like crazy. She's been begging me recently for more food and her T4 levels are elevated again, but this coincided with losing our other cat. I've always just put food down on demand, so never known exactly what's normal for her, so would be interested to hear how much other oldies eat.
She's 17, weighs 4kg and on a good day eats 3.5 pouches, on a bad day 6 pouches and a couple of treats. When her hyperthyroidism is back under control, it would be good to know how much others eat.