Because meat from grass-fed animals is lower in fat than meat from grain-fed animals, it is also lower in calories. (Fat has 9 calories per gram, compared with only 4 calories for protein and carbohydrates. The greater the fat content, the greater the number of calories.) As an example, a 6-ounce steak from a grass-finished steer can have 100 fewer calories than a 6-ounce steak from a grain-fed steer. If you eat a typical amount of beef (66.5 pounds a year), switching to lean grassfed beef will save you 17,733 calories a year—without requiring any willpower or change in your eating habits. If everything else in your diet remains constant, you'll lose about six pounds a year. If all Americans switched to grassfed meat, our national epidemic of obesity might diminish.
Grass-fed meat is better for human health than grain-fed meat in ten different ways, according to the most comprehensive analysis to date. The 2009 study was a joint effort between the USDA and researchers at Clemson University in South Carolina. Compared with grain-fed beef, grass-fed beef was:
- Lower in total fat
- Higher in beta-carotene
- Higher in vitamin E (alpha-tocopherol)
- Higher in the B-vitamins thiamin and riboflavin
- Higher in the minerals calcium, magnesium, and potassium
- Higher in total omega-3s
- A healthier ratio of omega-6 to omega-3 fatty acids (1.65 vs 4.84)
- Higher in CLA (cis-9 trans-11), a potential cancer fighter
- Higher in vaccenic acid (which can be transformed into CLA)
- Lower in the saturated fats linked with heart disease
S.K. Duckett et al, Journal of Animal Science, (published online) June 2009, “Effects of winter stocker growth rate and finishing system on: III. Tissue proximate, fatty acid, vitamin and cholesterol content.”
"Cattle (like sheep, deer and other grazing animals) are endowed with the ability to convert grasses, which we humans cannot digest, into flesh that we are able to digest. They can do this because unlike humans, who possess only one stomach, they are ruminants, which is to say that they possess a rumen, a 45 or so gallon fermentation tank in which resident bacteria convert cellulose into protein and fats.
In today’s feedlots, however, cows fed corn and other grains are eating food that humans can eat, and they are quite inefficiently converting it into meat. Since it takes anywhere from 7 to 16 pounds of grain to make a pound of feedlot beef, we actually get far less food out than we put in. It’s a protein factory in reverse.
How has a system that is so wasteful come to be? Feedlots and other CAFOs (Confined Animal Feeding Operations) are not the inevitable product of agricultural progress, nor are they the result of market forces. They are instead the result of public policies that massively favor large-scale feedlots to the detriment of family farms.
From 1997 to 2005, for example, taxpayer-subsidized grain prices saved feedlots and other CAFOs about $35 billion. This subsidy is so large that it reduced the price CAFOs pay for animal feed to a tiny fraction of what it would otherwise have been. Cattle operations that raise animals exclusively on pasture land, however, derive no benefit from the subsidy.
Under current farm policies, switching a cow from grass to corn makes economic sense, but it is still profoundly disturbing to the animal’s digestive system. It can actually kill a steer if not done gradually and if the animal is not continually fed antibiotics.
According to David Pimentel, a Cornell ecologist who specializes in agriculture and energy, the corn we feed our feedlot cattle accounts for a staggering amount of fossil fuel energy. Growing the corn used to feed livestock takes vast quantities of chemical fertilizer, which in turn takes vast quantities of oil. Because of this dependence on petroleum, Pimentel says, a typical steer will in effect consume 284 gallons of oil in his lifetime." The Food Revolution Network, The Truth about Grassfed Beef , 12-19-2012