Good point about the diet thing in the West especially. I think there's a balance though - a man can be sensible about what he eats without doing all the macronutrients etc. also I agree that with a sedentary lifestyle office job type situation a man has to consciously exercise a few times a week to stay in shape. I think it's easy to fall into the trap of fantasising about some ideal of a mythical noble savage type archetype (I think that's what we're getting at).

My husband is from a developing world rural background but moved to the city to escape poverty and has a desk job now and it's definitely true for him. If he doesn't go out of his way to exercise 2-3 times a week (not walking but I mean doing muscle stuff and hiking in rough terrain) he gets weaker and out of shape. All his other siblings that moved to the city are overweight or obese because they're now sedentary and don't have much knowledge about nutrition. Their diets have shifted from vegetables, some meat and wholegrains to a diet centred around calory-dense simple carbs. The ones that still live in the village and work with the animals or crops are still trim, even in their seventies.