Every vegetarian I’ve met or heard of is vegetarian because of either a) animal welfare, b) climate change or c) cultural tradition. It seems very unlikely that any of these factors could be strongly genetic.
They’re determining genetic heritability by comparing identical twin pairs with non-identical twin pairs (i.e. if the identical twins are more similar in their preferences than non-identical twins, they assume that there’s more of a genetic component). I imagine that there could be lots of confounders here. Growing up as an identical twin is a different experience to being a non-identical twin. There could be different environmental factors between the two situations (e.g. maybe identical twins tend to feel closer and more closely mimic each other’s behaviours/choices).
Doesn’t pass the sniff test for me. Two concerns:
Every vegetarian I’ve met or heard of is vegetarian because of either a) animal welfare, b) climate change or c) cultural tradition. It seems very unlikely that any of these factors could be strongly genetic.
They’re determining genetic heritability by comparing identical twin pairs with non-identical twin pairs (i.e. if the identical twins are more similar in their preferences than non-identical twins, they assume that there’s more of a genetic component). I imagine that there could be lots of confounders here. Growing up as an identical twin is a different experience to being a non-identical twin. There could be different environmental factors between the two situations (e.g. maybe identical twins tend to feel closer and more closely mimic each other’s behaviours/choices).