True enough, life span was often short until fairly recent times. In the distant past there were many factors affecting life span, e.g., diseases, accidents, p

True enough, life span was often short until fairly recent times. In the distant past there were many factors affecting life span, e.g., diseases, accidents, predation (by large feline species in particular), childbirth to name a few. However there is evidence of populations in pre-agricultural times which had favorable environments and consequently better health. In fact there was just published by the Smithsonian an interesting article describing findings in the 9000 year old Kennewick Man specimen. Of particular interest was a comment about the condition of the teeth: all intact, no cavities attributed to low CHO diet. Age at time of death was estimated to be 40 years old. Not bad for 9000 years ago. BTW I'd appreciate references you have to the differences in pre- and early post-agricultural health in human populations. Isolating dietary effects on health is difficult to be sure and a subject I'm always eager to learn more about. As far as my diet is concerned, vegetables are emphasized, especially the green, leafy kind. (Foods that are relatively high in protein, low in CHO.) I recommend, and practice myself, reducing grains to a minimum. As you no doubt know, protein, certain fats, a bunch of minerals and vitamins are essential to humans because we can't synthesize certain molecules--we must get them in our diet. Curiously, there is no essential carbohydrate. Our bodies can produce all the CHO it needs from non-CHO sources. That's not to say CHO intake is not useful, and it is useful as a source of calories. In the past when calories were expensive, less costly CHO sources of calories were valuable, in essence to prevent starvation. In the current era when calories are extremely cheap, high CHO intake is positively dangerous--it's easy to consume a surplus of calories. Interestingly, the data shows over the last 30 years there has been very little change in dietary fat intake in the USA, but sugars have increased dramatically. The rise in obesity has been attributed to inclusion of sugars in manufactured foods. The idea of decreasing dietary CHO intake, especially sugars, is logical. Gluten and corn intolerance is common according to reports. Wheat, corn and many other grain products are grass seeds. Grass and its seeds are frequently allergenic to humans, which supports the idea humans are not native grass eaters, hence the advice to minimize it.