This is pretty much nonsense. Different races have all kinds of different builds in different climates. I suppose you'd say Eskimos are stubby and fat to retain heat. Except you'd be wrong because the ones living in the outback are of average height and leaner than most populations. Short arms for altitude? The Masai are highland plains people, ya seen pictures?
Diet determines build and height in a population. I stand by my assertion. The Dutch have gone from the shortest people in Europe to the tallest and among the healthiest because now they eat lots of meat and cheese. The Sikhs are ethnically identical to neighboring muslims and hindus but are much taller and leaner because they eat a dairy heavy diet. Hispanics are relatively short and chubby because they eat cheap starchy food.
Diet determines build and height in a population. I stand by my assertion. The Dutch have gone from the shortest people in Europe to the tallest and among the healthiest because now they eat lots of meat and cheese. The Sikhs are ethnically identical to neighboring muslims and hindus but are much taller and leaner because they eat a dairy heavy diet. Hispanics are relatively short and chubby because they eat cheap starchy food.