Popcorn

Popcorn comes in many different flavours. They can be combined, giving a mixed effect. Eating popcorn will gradually change the eater towards a specific flavour final state. Eating after reaching this state won't change a person further, although be careful, popcorn still has plenty of calories.

Flavours

Chocolate coated popcorn - gradually turns the eater into a person of African descent
Cinnamon popcorn - gradually turns the eater into a person of South Asian descent
Vanilla flavoured popcorn - gradually turns the eater into a person of European descent
Spicey popcorn - gradually turns the eater into a person of Latin American descent
Matcha dusted popcorn - gradually turns the eater into a person of Japanese descent
Caffe Mocha popcorn - gradually turns the eater into a person of Middle Eastern descent
Sour Cream popcorn - gradually turns the eater into a person of Irish descent (including red hair and freckles)
White chocolate coated popcorn - gradually turns the eater into a person of Scandinavian descent

Sugar popcorn - gradually gives the person more bimbo features including expanded breasts, ass and lips as also a fitting personality, men eating those will gain feminine traits
Salted popcorn - gradually gives the person more male features, women slowly change into futanari, men become even more masculine
Butter popcorn - gradually gives the person traits of a country girl/boy

Plain popcorn - reverses the effects of flavoured popcorn, although some changes tend to stick even when reversed by plain popcorn (also, who likes to eat plain, bland popcorn?)