We are naturally thin. For 1.8 million years prehistoric man hunted and gathered proteins and fats, and no one was overweight. Then, 10,000 years ago, with the agricultural revolution, historic man discovered that he could grow grasses, carbohydrates, mainly wheat, sugar cane, and corn, ushering in the "diseases of civilization." Men and woman of leisure became obese. The end of the Second World War allowed us to turn our attention to feeding the world, with "frankengrains" and refined foods. Suddenly, we found that we all were overweight, poisoning ourselves with grasses, cereal grains that we were never meant to eat, that our body just cannot properly digest. Grass-Free is a review of how to stop poisoning ourselves, of how to get back to our natural weight, and of how to stop a dangerous, toxic environment from killing us.