grass fed beef is not a good source of omega fatty acids

How does grass fed beef compare to other foods?

A 100g serving of grass-fed ground beef has about 0.071 grams of omega-3 fatty acids, according to the U.S. Department of Agriculture’s National Nutrient Database. This means that a 100g contains around 6.5% of the female RDA and 4.4% of the male RDA. A burger might be up to 180g so that would be 11.6% of a womans, or 7.9% of mans allowance.

Compared to this, 100g of Walnuts contains 6.2g of Omega 3, or 560% of a womans RDA (387% of a males'). This is almost 100 times more than grass fed beef by weight. Our large grass fed beef burger above contains as much as 2g of walnuts, which is less than a single walnut half.

Hamilton et al., 2005 found that the n-3:n-6 was about 10 in wild salmon and 3-4 in farmed salmon. A 100g portion of wild salmon contained 1.2g of n3, and 0.1g of n6, whereas farmed contained more of both: 100g farmed salmon contained 3.3g n3 and 0.9g of n6.

For comparison, a tablespoon of canola oil (approximately 14 grams of canola oil) contains 1.28 g of ALA.

2.57g per ounce aka per 28g aka per 11.6 walnut halves, aka 0.22

Additionally, while grass fed beef can contain around 50% more Omega 3 fatty acids than grain fed, a standard portion contains only (65/1600)*100 =4% (Source) of the recommended female daily allowance. For context, a single walnut half contains 3 times this amount at 185mg. The comparison of omega 3 and 6 fatty acids between grass and grain-fed beef has no practical relevance to human health.

Food Serving size ALA (Grams) DHA (Grams) EPA (Grams)
Flaxseed oil 1 tbsp 7.26 - -
Chia seeds 1 ounce 5.06 - -
English walnuts 1 ounce 2.57 - -
Flaxseed, whole 1 tbsp 2.35 - -
Salmon, Atlantic, farmed cooked 3 ounces - 1.24 0.59
Salmon, Atlantic, wild, cooked 3 ounces - 1.22 0.35
Herring, Atlantic, cooked 3 ounces - 0.94 0.77
Canola oil 1 tbsp 1.28 - -
Sardines, canned in tomato sauce, drained 3 ounces - 0.74 0.45
Salmon, pink, canned, drained 3 ounces 0.04 0.63 0.28
Soybean oil 1 tbsp 0.92 - -
Mayonnaise 1 tbsp 0.74 - -
Oysters, eastern, wild, cooked 3 ounces 0.14 0.23 0.30
Sea bass, cooked 3 ounces - 0.47 0.18
Edamame, frozen, prepared ½ cup 0.28 - -
Shrimp, cooked 3 ounces - 0.12 0.12
Refried beans, canned, vegetarian ½ cup 0.21 - -
Lobster, cooked 3 ounces 0.04 0.07 0.10
Tuna, light, canned in water, drained 3 ounces - 0.17 0.02
Tilapia, cooked 3 ounces 0.04 0.11 -
Scallops, cooked 3 ounces - 0.09 0.06
Cod, Pacific, cooked 3 ounces - 0.10 0.04
Kidney beans, canned ½ cup 0.10 - -
Ground beef, 85% lean, cooked 3 ounces 0.04 - -
Bread, whole wheat 1 slice 0.04 - -
Egg, cooked 1 egg - 0.03 -
Chicken, breast, roasted 3 ounces - 0.02 0.01
Milk, low-fat (1%) 1 cup 0.01 - -