In an era where food choices can significantly impact both personal and environmental health, the distinction between grass fed and grain-fed beef has never been more relevant. While all beef provides essential nutrients, the way cattle are raised creates meaningful differences in the final product’s nutritional profile and environmental impact.
PART 3 OF 4
As consumers become more conscious about their food choices, understanding these differences becomes crucial for making informed decisions about the meat we put on our plates.
The Revolutionary Impact of Regenerative Grazing
Regenerative grazing practices represent a fundamental shift in livestock management. This approach, also known as Adaptive Multi-Paddock (AMP) grazing, involves rotating animals through multiple smaller paddocks within a pasture. This method mimics natural grazing patterns of wild herbivores and offers numerous environmental benefits:
| Enhanced soil health and fertility | Increased biodiversity |
| Improved carbon sequestration | Better water retention |
| Reduced parasite exposure for livestock | Enhanced nutrient density in the final product |
These practices create a virtuous cycle where healthier soil leads to more nutritious forage, which in turn produces healthier animals and more nutritious meat.
The Fat Factor
The fat composition of beef tells another important story. Before we dive into types of fats, let’s first address the overall fat content. Feedlots have significantly increased the fat composition of ruminant animals like cows, resulting in meat that’s much fattier than what was historically consumed. Wild animals, by contrast, are naturally lean.
Modern feedlots rely on energy-dense feeds and restrict livestock movement, promoting rapid weight gain and increased fat deposits. This raises the question: Are today’s super-fatty ribeye steaks from CAFO beef truly “ancestral”?
Now, when it comes to the type of fat in beef, this is where beef differ from chickens and pigs (who have a single stomach). The fat of all ruminant animals have relatively low levels of linoleic acid (LA), even if they are eating some higher omega-6 PUFA sources. This is because their stomach has a ‘biohydrogenation chamber’ that contains bacteria that can convert the high LA fat they eat from grains and seeds into saturated and monounsaturated fats.
While all ruminant animals naturally convert some dietary fats through biohydrogenation, the final fatty acid profile still differs between grass fed and grain-fed beef. Research by the Weston A. Price Foundation found that grass fed tallow contains 45% less total polyunsaturated fatty acids (PUFA), 66% less omega-6 linoleic acid, and 36% more saturated fat stearic acid.18
This fat composition difference becomes particularly relevant in the context of modern diets, which already often contain excessive amounts of omega-6 fatty acids. What’s more — there is ongoing research on how the PUFA content of cows can be increased even more! Based on the false premise that saturated fats are bad for us, and PUFAs are good for us.
This research of dairy fatty acid manipulation started in the 1980s — “Interest in manipulating the fat content of milk was in full force entering the 1980s. The Dietary Guidelines for Americans published in 1980 by the U.S. Department of Health and Human Services and the Department of Agriculture (USDA) emphasized reductions in total fat, saturated fat, and cholesterol.”19
Rumen bypass or “rumen escape” technology is used to protect proteins and lipids from degradation in the rumen, allowing them to be digested more efficiently in the small intestine and altering the fatty acid composition.20 Attempting to bypass the natural biohydrogenation process in the rumen!
A few methods that can lead to PUFAs bypassing the rumen include high levels of distillers grains in the diet,21 calcium soaps of fatty acids to protect PUFAs from the ruminal biohydrogenation,22 and the inclusion of various other whole, treated or protected oilseeds like whole cottonseed, roasted soybeans, canola seed, sunflower seeds, flaxseeds.23
Calcium soaps have been used with soybean oil (rich in linoleic acid) to maximize the delivery of omega-6 fatty acids to the duodenum for absorption.24 The use of rumen bypass techniques allow for more of the dietary linoleic acid to be absorbed intact and incorporated into the beef25 — not what we want!
Some studies do not measure the linoleic acid change in the meat, but it is likely that feeding rumen-protected oilseeds would increase the linoleic acid content beyond normal confinement beef levels.
There is also research into using transgenic techniques to modify fat content in animal products, including beef,26 which involves genetically modifying the animals themselves. Why can’t we just leave Mother Nature alone? We will never out smart her!
The Metabolic Health Connection
The health of the animal directly impacts the quality of its meat. Research shows that pen-finished animals display elevated glucose metabolites, triglycerides, markers of oxidative stress, and proteolysis compared to pasture-finished animals.27,28 Extended grain feeding can lead to insulin resistance in ruminants,29 and studies have documented different energetic levels between grass fed and grain-fed animals.30
While the full implications for human health are still being studied, some research suggests that consuming products from pasture-fed cattle may have different metabolic effects compared to those from grain-fed cattle.31 This raises important questions about how the metabolic health of livestock might influence the metabolic health of consumers.
When an animal has poor metabolic health, detoxification systems are downregulated. Add on top of that, higher bacterial and toxin load when in confinement, and that is a recipe to get sick! So of course a long list of ‘routine vaccinations’ and regular antibiotic use are required to maintain health!
Part 3 of 4; Analysis by Ashley Armstrong
ABOUT THE AUTHOR – Ashley Armstrong is the co-founder of Angel Acres Food Club, which specializes in low-PUFA (polyunsaturated fat) eggs that are shipped to all 50 states, and Nourish Food Club, which ships 100% grass fed, vaccine-free, regeneratively raised beef and lamb, plus low-PUFA pork and chicken, A2 dairy and cheese, and traditional sourdough to all 50 states. Waitlists will reopen shortly.
- 18 The Weston A. Price Foundation, January 21, 2014
- 19 J Dairy Sci. 2006 Apr;89(4):1302-10
- 20 Ag Proud, February 1, 2016
- 21, 25 Meat and Muscle Biology 5(1), 34, 1–16
- 22, 24 Animals (Basel). 2021 Jun 12;11(6):1764
- 23 Front Vet Sci. 2022 Jul 21;9:923937
- 26 The Role of Biotechnology in Improvement of Livestock. 2015 Apr 8:55–89
- 27 J Anim Sci Biotechnol. 2023 Apr 1;14:49
- 28 J Anim Sci Biotechnol. 2023 Apr 1;14(1):49
- 29 J Anim Sci. 2022 Jul 1;100(7):skac182
- 30 Meat Sci. 2020 Mar:161:107996
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