mark,
the point i was making about eating meat alone was this.how did they determine that the fat content of their diet caused disease when all 3 macronutrients were present in their diet?maybe there is a pre determined notion that grains are harmless,so it has to be something else.
having a group of ppl eating only meat, a group eating all carbs,and one eating all 3 would be a better study.

as far as the cattle thing,yeah, they are fed mostly grain,because it is cheaper and faster than maintaining an all grass feed.thats why free range cattle cost more.
and i know some cows have been fed cow by products.that is how mad cow got started.but it isn't a major part of their diet.
greens,grass and such yield far less calories than grains.the caloric difference between grass and oats is probably night and day.you don't see fat deer and elk for this very reason.the grains in the cattles diet has also screwed up the omega fats ratio.making them rich in omega 6 and def. in omega 3's.so if sat. fats are indeed bad,it's the grains are meet is fed that causes it.

low glycemic/high glycemic.thats nice but not always good.milk has a low glycemic index but a huge insulin index.and it in no way gives any info on the effects wheat has on our body.wheat is very allergenic.many ppl are allergic to wheat not many are allergic to greens and meat.if it's good for us and we're meant to eat it,why is this?

vegans aren't all def. these days because they know they have to mix their grains with other grains to get the right amino acid profile.there was a thing not too long ago about pregnant vegan mothers being def.because of their diet and the babies had some type of problem from this.
meat eaters could get the essential amino acids from any animal without having to mix it with other meat.
my point was eskimos lived off of one main source of food,fish and thrived.try that with just one source of grain.

tim,calories in versus calories out isn't always a good yard stick.you can eat more calories on a high protein diet than you can on a high carb diet.
and i'm glad you brought up the harvard study.for some thats proof enough.