Because of chronic joint pain I find it hard to take on sufficient calories. My DH is a good bloke - does 99% of housework etc and has learnt to cook. He's naturally slim. He will have bread with every meal 'Toast and marmite for breakfast?! Not the same without some Sourdough and cheese on the side!'; we could have Sushi and he'd crowbar a couple of slices of sourdough in.
However, I've noticed that if I admit to a hint of appetite he'll comment on how hefty the dish was, how there was enough in 'one portion' to share for two etc. I've just come back from a over a week in hospital where one nurse (lovely lady) really tried to get me to eat and have lost even more weight