If you're not feeling well, nothing beats curling up with a well-made, full fat, made with real sugar ice cream. Especially if it's a simple flavor like chocolate or vanilla. Nothing to distract you from the cool, creamy sensations that come from spoiling yourself.
Except if you're lactose intolerant. Then I expect that eating milkfat enriched products like that would be bad.
Or if you're trying to follow that Atkins diet thing, because of all the sugar.
Or if you're diabetic and your sugar is in bad control. Then that sugar would probably make you feel sick.
Other than that, real ice cream is da bomb.