For what it's worth. We're on a lowish income. Husband retired, me working part-time.
We eat well and are both reasonable cooks. Quite a lot of pasta, wholemeal bread, rice, fruit and veg. Fish a couple of times a week. Rather less meat than many people would have. Very little convenience food. We enjoy cooking. My husband is about the same height as I am - below average height for a bloke. He's quite busy, but not dashing about working 9 to 5 and commuting etc etc. So he'd been at home doing stuff all yesterday. We'd had a cooked breakfast - so plenty of protein - and he also eats porage then too. (I don't) I think there'd been baked beans on toast at lunchtime, plus a banana and dried fruit, then more toast and jam at 4.
He's the one who fluctuates more between saying 'We ought to be vegetarian' but then wanting to meat/fish for supper after he's had bacon for breakfast. I'm probably more consistent in terms of the amount of animal protein I cook. (One vegetarian supper, then a fish/small amount of meat supper the next night. A really meaty main dish just once or twice a week.)
We do probably keep an eye on Government guidelines etc about fruit and veg, red meat, oily fish etc. My husband is keen to have a long and healthy retirement. But it doesn't feel joyless or self-denying - if there's something we fancy, as a rule we'd buy, cook and eat it.
I was probably being a bit irked by other aspects of his behaviour yesterday. He and I have both agreed that supermarket portions of fish aren't huge and domestically (though not necessarily on Mumsnet) Fishgate is over.