Think about the food sources that were available.  In northern Europe, you'd
have animal sources, but edible human plant food (like fruits) are not as
abundant, and much more seasonal.

> So maybe this theory is true, what I don't understand is why people from
> colder climates need less carbs and vice versa. I thought it would have
> been
> the other way around??!!
>
> You need heat!
> In nature protein is always accompanied by fat.
>
>