Excellent way to eat without worrying about calories. Yes without counting calories :)
Only catch is that there is no pasta, sugar, bread, cookies, chocolate, grains :) but if you want to feel full of energy get a six pack or lose some fat, gain muscle, improve health, beat diabetes this is for you.
Base of this theory is that our metabolism didn't change much from days of when humans were hunters and gatherers (only way to get some food in days of dinosaurs :)) but what is interesting that these cave men weren't plagued by modern day diseases, in fact they were much healthier then we are today. They didn't live long but they didn't die from stroke, cancer, heart failure, they died from animal attacks from cold, but they were quite healthy, and since of agricultural revolution or start of grain cultivation there is more and more of cancer, heart problems, obesity,...
One thing that could attract is that cave men were muscular with low body fat, who doesn't want that kind of body !
I am a big fan of Zone Diet by Barry Sears and Paleo Diet would be just as good, Zone diet is good but you need to count blocks of foods (weight), Paleo allows you to eat without that kind of worries, just remember not to over stuff yourself with food.
Here is a great web page where you can get lots of info for free http://www.robbwolf.com/
Have a nice Paleo day.
