Let's take cod liver oil(CLO), or buckley's cough syrup as examples. Neither are sweetened, and though I could probably mix em with a pint of ice cream, it would take a lot longer to ingest (especially if one were to try this on a semiregular basis).
Now, don't go and drink cough syrup every day... though in high school I knew a few people who did, and they're perfectly well-adjusted members of their AA groups by now.. So let's forget the buckley's for a moment and focus on cod liver oil(CLO).
The rule used to be an inverse relationship between a healthy benefit and taste. Cake= bad for you=tastes good. I don't need to expound on why CLO is good for you, right? Vitamins, minerals, and that yummy fishy flavor.
As we all know the human tongue has special cells for tasting different types of food, based positionally. The part that tastes really bad stuff is in the back, which probably has something to do with gagging, which we're trying to avoid. Okay, enough with the intro. Here's how to get around bad tasting food. Put the food just past the tip of your tongue, and push that against the roof of your mouth. This will give that CLO a little flip, right down your gullet, and past the back part of your tongue. It takes a little practice, so try it with olives or jellybeans or bits of mushroom or something before you step up to CLO. And there's no reason you can't wash down the extra with a little cold water, or even a bit of bread to sop up the extra oil.