The Paleo Diet - Loren Cordain [97]
The only limiting factor is cost. Fresh fruits and vegetables cost more than beans and white rice. Lean pork tenderloin and turkey breasts are more expensive than potatoes and bread. The starchy foods of the Agricultural Revolution are the world’s cheap foods. Grains, legumes, and tubers are the starchy foods that have let our planet’s population balloon to more than 6 billion. They’re also the foods that have enabled us to grotesquely fatten our livestock in feedlots to satisfy our craving for fatty meats. They’ve allowed us to pollute our food supply with billions of tons of sugar and high-fructose corn syrup. They’re also the foods responsible for destroying the balance of omega 6 and omega 3 fats in our diet. Without them, the world could probably support one-tenth or less of our present population; without agriculture’s cheap starchy staples, it is no exaggeration to say that billions of people worldwide would starve.
It is unfortunate that for most of the world’s people the diet to which they are genetically adapted now lies beyond their financial reach. The foods decreed by our genetic heritage and the foods we all ate before the Agricultural Revolution have now become the elite foods of wealthy, privileged countries.
However, there are many immediate practical steps that could be taken to improve the nutritional quality of the world’s food supply and make everyday diets more like those of our Paleolithic ancestors.
Healthier Livestock
Cereal grains are an inferior food for livestock as well as for humans. Many of our health problems related to overconsumption of saturated fats and omega 6 fats are directly attributable to the practice of feeding grain to livestock. Today, 70 percent of the U.S. grain harvest is fed to cattle, but there is no pressing need to do this. In modern beef production, cattle generally spend the first half of their lives grazing on pastureland or rangeland. They typically receive commercial cereal feeds during the second half of their lives. If we didn’t confine cattle to feedlots and essentially force-feed them cereal grains, we could produce a healthier meat product by simply allowing these animals the freedom to graze outdoors all their lives.
Feeding grain to cattle dilutes the healthful omega 3 fats and increases the omega 6 fats. It also produces an obese animal that may have as much as 25 to 30 percent of its body weight as fat. Three- to 4-inch layers of pure fat lie just below the skin. Fat dominates the abdominal cavity and even infiltrates the muscle tissue. This infiltration of fat between the muscles, called “marbling,” is one of the major reasons why grain is fed to cattle: cattle producers believe the consumer likes a nicely marbled steak. But a nicely marbled T-bone steak may contain more than 60 percent of its total calories as fat. Even lean, grain-fed beef, trimmed of all of its fat, contains more than twice the fat that is found in pasture-fed cattle or wild game meat. The predominant type of fat in grain-fattened cows is saturated fat. A 100-gram serving of a fatty T-bone steak gives you 9 grams of saturated fat. The same serving of a lean steak from a pasture-fed cow gives you only 1.3 grams of saturated fat.
Feeding grain to cattle has a harmful effect on nutrients as well: cattle fed on pasture alone produce meat that contains five times more conjugated linoleic acid (CLA) than grain-fed cattle do. Conjugated linoleic acid is a good type of fat that may be one of our most powerful allies in the war against cancer; in studies of laboratory animals, tiny amounts of CLA have effectively reduced tumor growth. Grass-fed livestock also produce meat that contains four times more vitamin E and selenium than grain-fed animals have. Both vitamin E and selenium are powerful antioxidants that protect us from cancer and heart disease.
Basically, feeding grain to cattle takes a good, healthful food—lean meat—and turns it into a less nutritious, fatty food that has a high potential for impairing