Personally, I think that it is a kind of "artificial natural selection", just as butterphly01 mentioned. Babies with bigger heads have now more chances to survive at birth.
As for the diet component, animal proteins are well present in today's diet (I am speaking of the SAD). Exceptions are vegetarians (and strict vegans), however I think that a modern vegetarian has more knowledge of what is in the food they are eating than a neolitic vegetarian from 10.000 years ago. In other words, they know what to eat in order to get their daily amount of full proteins. Along with tons of carbs of course, but for that there's cronic cardio, isn't it?
Last edited by jes1014; 06-12-2012 at 08:01 AM.
Primal since 3/10/12 - removed lap band 5/11/12
Maybe the circumference of adult skulls is getting larger, too, but that's just what they don't say. The only metric mentioned here is "height" of the skull:
If one is going to measure a three-dimensional object at all why one would measure it in only one dimension -- and then go on to equate that measurement to the "size" of the object -- entirely escapes me. But there we are.New measurements of hundreds of skulls of white Americans born between 1825 and 1985 suggest that [the] typical ... height [of the skull] has [increased] by about a third of an inch (eight millimeters).
But why even stop at three measurements, which must surely be the minimum for any 3D object? Actually, I'd have supposed that, these days, if one thought it worth taking measurements of a complex natural form, be it a skull or a shell, that one would map it entirely in 3D-space using lasers and computers. Then there'd be a chance to look at the morphology in detail on a computer ... and even find out things you hadn't even thought of.
How about noses, for example? To go back to Weston Price. In Nutrition and Physical Degeneration there is, for example, this:
With the legend:
So, for example, can any difference between the skulls of white Americans from 1825 to 1985 be seen in respect of the bones around the nasal cavities? Worse? Better? The same?FIG. 14. This white boy was born and raised in Alaska on imported foods. His facial deformity includes a lack of development of the air passages, so that he breathes through his mouth. Lack of bone development creates the crowded condition of the teeth. Note his narrow nostrils.
I mean Nutrition and Physical Degeneration is old stuff. It was published in 1939. Nowadays we should be looking at things in far more detail and using the latest technology -- but people are measuring the heights of skulls in one dimension with a pair calipers ... Good grief! That's science?
it's national geographic, shouldn't that answer it all? That is one crummy mag. I used to subscribe but then i got fed up w/ their liberal slant in every damn article. That was years ago. Maybe it's changed.
and yeah i like your point about only measuring one direction.