Plenty of people do eat a entirely carnivorous diet, but no one would recommend an all muscle meat diet. Get some variety of animals, and definitely eat offal.

If you can guarantee good provenance, then try eating some of it raw.

It is relatively untested so, yes, it is risky for that reason. That said, if you want some inspiration, check this out: http://inhumanexperiment.blogspot.com/2009/09/two-brave-men-who-ate-nothing-but-meat.html

http://www.rawpaleoforum.com/journals/lex's-journal/

Lex Rooker has been keeping a journal on line since June 2008 regarding his experiment in eating nothing but raw meat and fat he gets from Slanker's grass fed beef in Texas. He has been on this experiment for 4 years...not anymore an experiment...but now a lifestyle.

You can read his journey...all 102 pages.

His current ratio is about 75/25 fat to protein...eating about 1.5 pounds per day once a day. He had a Dexa scan a while ago and it came back excellent..and was reviewed by Dr Harris about 6 months ago. His blood lipids are fine. He has no scurvy. He did pass a painful kidney stone a while back. The question is did his 12 or so years of veganism set up the stone or did the meat diet set up the calcium stone? No one seems to know. It seems that both meat eaters and vegetarians get stones.

Lex has recently been getting a lot of SoCal Vit D3 sun with hour walks daily with only shorts on. His dentist tells him the calculus build up he used to experience has abated since the walks.

So Lex's n=1 experiment has not adversely affected him in any way. If you want an all meat diet, go for it.

If you wander over to the ZOIH (Zeroing in on Health) board you will find hundreds of people eating nothing but meat 100% of the time and none are suffering any trauma from it. They would claim (and I agree) that it is the healthiest way to eat.

Personally, I wouldn't go on an all-meat diet just on general principles, but I'd be a lot less worried about going on a meagan diet than I would be about going vegan. I'd think that eating organ meats and marrow and bone broth would be a really good idea if one did this, again on general principles.

I think a zero-carb diet is certainly possible, but probably not optimal. Every HG tribe on the planet eats plant matter of some source (even the inuit store berries), we don't know exactly why (acid/base balance perhaps?) but nutritional science is very very new. I think it's better than the SAD, but then again, how hard is that?

I'll wager a few leafy greens are not going to make you feel any worse than you do on ZC.

Remember that the results from Stefansson's trial are not conclusive. X-rays were used to measure the amount of bone loss. X-rays can only detect it once you lose 30% of your bone mass. They also didn't measure his bone mass before the meat trial, they just calculated it afterwards and assumed his "before" bone mass was that of the average western person.

You can read more about it here: http://donmatesz.blogspot.com/2010/03/paleo-diet-ph-does-it-matter-part-vii.html

As far as I am aware we evolved in tropical Africa where the temperature was warm even through the ice age. See if it works out for you, I don't think it's optimal.

Eskimos prior to contact ate a 60% fat and 40% protein diet. They apparently thrived on such a diet however a sizable portion did develop osteoporosis later in life. In fact, native Eskimos have the highest rate of osteoporosis in the world. I recall reading somewhere that the upper healthy limit of protein intake is in the range of 30% of daily calories.

Bottom line, load up on the fat and protein but also eat your vegetables.

I have been eating only meat for almost 6 months now, and I feel better than I've ever felt in my life.