I have same problem as you. After my first dose of chemo I've lost 7lbs, but actually I have been eating. Probably not as much as I have. I tend to have to look at the time to remind myself that I should be eating. I certainly don't eat because I fancy something. It's definitely fuel for me at the moment.
This time round I can't snack on the high calorie foods due to stomach problems, but I am learning to have in the house all foods I can handle then if I want to pick I can. I try to have about 6-8 small meals a day rather than 3 large ones. My latest have snack type foods are crumpets, hot chocolate - turkish delight flavour, Ben and Jerry's chocolate brownie frozen yogurt, snack a jacks, toast, fruit pastilles, cheerios, porridge, go ahead bars and some little vegetable fritter type things I found in Sainsburys. None of these are high in fat or calories, this isn't because I'm on a diet lol - I can't process fats/biles so have to "build" up my weight with large quantities of safe foods. Oh and Uncle Ben's microwave rice!
I wish I could do the anti cancer diet - but my body just won't allow it, so I'm now eating to suit my body and what it needs/craves.
Last year on chemo I had things like fish fingers, soups, custard, ice cream, biscuits and puddings always available for when I did want to eat. I lost my appetite and tastebuds so really struggled to eat at all. So I went for very high calorie foods in small quantities and ate when I could handle it. It is so incredibly hard and I really feel for you. I'd keep a food diary - then create a list of foods which are good to have in the house for when you're up to it - easy stuff which you can stick in oven or microwave that doesn't require much prep or fuss.
How about milkshakes?
Not sure if this will be any good to you?http://www.chemocookeryclub.com/recipes