You'd be hard-pressed to find it in the long Conker's Bad Fur Day commentaries, but director Chris Seavor explained how he likes to put some kind of logic behind why certain things in video games that are taken for granted are that way in Conker. One of them was the use of floating items, why in these ultra-realistic first-person shooters you'd still find an item floating in the air, which is an entirely video gamey thing but doesn't make sense in the world of the game. That's why he made the anti-gravity chocolate health pickups. It doesn't make any sense why there's anti-gravity chocolate other than the scientist being an oddball with weird inventions, but at least that explains why it just floats there, lol. (Although in the context of needing a squirrel and nothing but a squirrel to replace a missing table leg that is causing the king's milk to spill, it does make sense.)