I'm not a big mayo person, but mayo is OK. It's usually made with Omega 6 oils I'm trying to avoid, so I need to make my own--there's all sorts of recipes, I just use olive oil in the mayo. I also love mashed avocado instead of mayo in things like fish salad. YUM! You can use sour cream or cream cheese too. When I do use mayo, I like to add a touch of curry powder, it makes it taste better to me.Do you use Mayo in your tuna salad and such?
Blackspinner, anything you can get your parents to eat at this time is good, so don't worry about the soy! Elderly people lose a lot of their taste sensations except for sweet, so they'll often eat sweet stuff to the exclusion of other things. You can make th eprotein shakes and freeze them in an ice cream maker if you have one--they may really enjoy protien ice cream. Or if you're really ambitious, make REAL custard (from eggs and cream!) and freeze it.
The least expensive good tasting whey powder I've found is Body Fortress at Walmart. Well, not really, you can get a HUGE bag of Muscle Milk whey protein powder (6 lbs) at Costco for about $6 per pound--it's got too much Splenda and some kind of vanilla flavoring in it. At first I was OK with it, but now it tastes and smells VILE to me.
A lot of people say protein powder is OK, including paleo people who usually eschew processed stuff. But I'm trying to get away from it--it was a quick and easy way to have a meal at work, but I think it's not so good for me. I've read Cate Shanahan's book, Deep Nutrition, and she doesn't like the concentrated amino acids in protein powders--she believes your protein should come from whole food sources. So far I haven't been brave enough to add raw eggs to my smoothies. I get my eggs from a fresh, trusted source (a local farm and I’ve even visited the “pastured” chickens), but I’m a little wary of trying that. Nut butters give a little protein, and there’s some in the almond milk and yogurt, too. And I’m trying to eat real food at lunch at work (that’s challenging for me).