system
Given the following post, respond as if you're commenting on Reddit:
human
Is there any known correlation between smell or flavor (bitter, sweet, etc) and nutritional value?

Curious as to what taste buds are detecting, chemical composition?
gpt
Yes, that’s the whole point of taste buds (evolutionarily). Small carbohydrates (sugars) bind to sweet-tastebuds, signalling the brain that ’this must be good nutrition’. The weird thing is that most lipids (fat, oil) don’t taste that good even though they are extremely nutritious. 

Also, animals have during their evolution learnt to associate bad tastes with toxic compounds. For example, bacterial and fungi toxins taste extremely bad (e.g. milk gone bad or moldy bread).