有可能。牛的饲料会影响各类牛肉的营养和脂肪。草饲牛肉通常来自终生只吃草和其他草料食物的牛。
常规饲养的肉牛通常会在某些时候食用含有谷物（例如玉米）的饲料。与其他类型的牛肉相比，草饲牛肉可能对心脏健康有一定益处。草饲牛肉可能有如下特点：
- 总脂肪量更少。
- 有益心脏健康的 ω-3 脂肪酸含量更高。
- ω-6 脂肪酸（亚麻酸）含量更高。
- 抗氧化维生素（如维生素 E）含量更高。
然而，草饲牛肉和常规谷饲牛肉都含有饱和脂肪。饱和脂肪与不健康的胆固醇水平有关。美国心脏协会建议限制饱和脂肪的摄入量。
挑选牛肉时，无论是草饲牛肉还是其他类型的牛肉，均请选择精瘦牛肉。精瘦牛肉的脂肪含量为 10% 或更低。草饲牛肉通常比常规的谷饲牛肉更贵。此外，能够绝对证明草饲牛肉对身体更好的长期研究有限。如果您想在饮食中添加更多精瘦牛肉（包括草饲牛肉），请咨询您的医疗护理专业人员或营养师。
显示参考文献
- Smith SB, et al. Producing high-oleic acid beef and the impact of ground beef consumption on risk factors for cardiovascular disease: A review. Meat Science. 2020; doi:10.1016/j.meatsci.2020.108076.
- Mozaffarian D. Dietary and policy priorities for cardiovascular disease, diabetes, and obesity: A comprehensive review. Circulation. 2016; doi: 10.1161/CIRCULATIONAHA.115.018585.
- Grass fed small and very small producer program. U.S. Department of Agriculture. https://www.ams.usda.gov/services/auditing/grass-fed-SVS. Accessed March 22, 2021.
- Saturated fat. American Heart Association. https://www.heart.org/en/healthy-living/healthy-eating/eat-smart/fats/saturated-fats. Accessed March 22, 2021.
- Hwang Y-H, et al. Fatty acid profiles, meat quality, and sensory palatability of grain-fed and grass-fed beef from Hanwoo, American, and Australian crossbred cattle. Korean Journal for Food Science of Animal Resources. 2017; doi:10.5851/kosfa.2017.37.2.153.
- Scollan ND, et al. Can we improve the nutritional quality of meat? Proceedings of the Nutrition Society. 2017; doi:10.1017/S0029665117001112.
- 2020-2025 Dietary Guidelines for Americans. U.S. Department of Health and Human Services and U.S. Department of Agriculture. https://www.dietaryguidelines.gov. Accessed March 22, 2021.
- Provenza FD, et al. Is grassfed meat and dairy better for human and environmental health? Frontiers in Nutrition. 2019; doi:10.3389/fnut.2019.00026.
- O'Connor LE, et al. A Mediterranean-style eating pattern with lean, unprocessed red meat has cardiometabolic benefits for adults who are overweight or obese in a randomized, crossover, controlled feeding trial. American Journal of Clinical Nutrition. 2018; doi:10.1093/ajcn/nqy075.
- Zeratsky KA (expert opinion). Mayo Clinic. June 2, 2022.
- Nogoy KMC, et al. Fatty acid composition of grain- and grass-fed beef and their nutritional value and health implication. Food Science of Animal Resources. 2022; doi:10.5851/kosfa.2021.e73.
Original article: https://www.mayoclinic.org/zh-hans/diseases-conditions/heart-disease/expert-answers/grass-fed-beef/faq-20058059