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.
(source)
| 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 | - | - |