Feeding up!

[pippitysqueakity]

My DH currently having treatment for bowel cancer and his weight is dropping alarmingly low. He has always been very slight, and now looks positively skeletal.
I make him lots of homemade soups for the vitamins,and use potato and pasta in them but am wondering what else I could feed him which is healthy but will help his weight? He used to love heavy meat based meals, but atm finds them difficult to digest. He likes to snack on crisps etc, always has, but I was hoping to give him something more healthy. His appetite does go up and down.
I make him porridge for breakfast, but he doesn't eat loads of it.
I looked at him properly yesterday and realised just how small and somehow reduced he looks and would really like to do something about it.
Any suggestions welcome.

Thanks Dancing Queen.
Cream in soups is a good idea, he says he's not keen on creamy things, but does seem to eat them when I give him them. I have never seen him snack on nuts, but will suggest it, he is quite conservative in his eating habits ( thinks couscous is posh, etc). Didn't used to eat soup before he married me unless it was from a tin, and orange, so he is coming on.
He does quite like ice cream, so will stock up on that. He is easy osy about cheese, doesn't eat it on its own like I do, but yes, adding it to things is a great idea.( Looking at this shows why I am overweight and he is not really!!)
Was trying to avoid supplements because I worried they might take away what little appetite he had, but they would be better than crisps, wouldn't they.
Thank you.

I second trying to add calories to existing easy to eat foods. Chuck in bitter, oil, cream, cheese etc to your normal cooking.

You said he doesn't feel like eating heavy meat meals, but would he eat some buttery mash with a stew with lots of veg and a bit of meat in? Macaroni cheese?

Hot chocolate to drink?

Rice pudding?

There is a great section on the Macmillan website with ideas and menu plans etc. When my mum was unwell, she loved the Mr Kipling sponge puddings, they're quite small and not too heavy but pack a punch calorie wise.