Hello I noticed when I watch videos from these two countries (S korea 2nd) that the people look very healthy. And when westerners travel and live in this places they get sick initially but then they feel better then ever. I don't think it has necessarily to do with the diet but how the food is produced, which chemicals,pesticides (different ones and amount) etc that they use. This is why I think they have longer lives and less diseases (less potent) than other places. If we can find out in what way they produce their food we can mimic it. I've not noticed this with any other country besides these two (maybe some outer parts of 'china' closer to them). Their food not only seems much more nutritious but also healthier. And possibility the water as well. And mental illness is less. their success a lot of it comes from how good their food is.