theme for a fantasy campaign

[Agemegos]

I forgot bananas and plantains, which are crops of the tropical elves, and sugarcane, which is a crop of tropical halflings. Also, vetches and pulses.

Ogretrolls and selkies, lacking starchy and sugary foods, are probably physiologically unaccustomed to and very susceptible to alcohol. Whereas halflings would probably die of dysentery if they didn't ferment every drop they drank into beer. Elves I think make wine, cider, and perry where they can, fermenting other fruit juices where they don't have grapes and pomes. Could they make beer out of some low-fat nut such as a chestnut, and what on Earth would it be like?

Amongst humans the farmers probably drink beer; the pastoralists have kumis at best and are probably susceptible to alcohol.

The race and peoples who don't drink alcohol most likely have other intoxicants: hallucinogenic mushrooms for the trolls; cannabis, poppy-juice, kava, kif, poisonous toads, etc. etc.