> but actual medically-approved food replacements are at a big price premium, because their use is so niche
No, they're expensive because no food manufacturer wants to kill the customers, and these customers tend to be at significantly increased risk of death.
> And if it's not going in your mouth, it can taste like ass.
Medical sole-source of nutrition products can be given through a naso-gastric tube, but many of them are designed to be drunk. Manufacturers have increased the range of flavours because they recognised that people hated the vanilla / chocolate / banana / strawberry limited range.
Funny how that information buried on the site. I've re-ordered a few times based on its (prominently featured) use of Isomaltulose, thinking that is where the sweetness came from. Some evidence that sucralose will spike insulin. Seems to jibe with personal experience. Will probably hold off until they eliminate sucralose. Perhaps trehalose?
Last year, though, a team of Israeli scientists put together a stronger case. The researchers concluded from studies of mice that ingesting artificial sweeteners might lead to—of all things—obesity and related ailments such as diabetes. This study was not the first to note this link in animals, but it was the first to find evidence of a plausible cause: the sweeteners appear to change the population of intestinal bacteria that direct metabolism, the conversion of food to energy or stored fuel. And this result suggests the connection might also exist in humans.
(And if it's not going in your mouth, it can taste like ass.)