Farmed salmon may not be as nutritious as it once was, new research suggests
摘要
新研究指出，养殖三文鱼的Omega-3脂肪酸含量较以往显著下降。全球近70%的消费三文鱼来自人工养殖，而美国膳食指南及美国心脏协会等机构仍建议每周食用8盎司此类高脂鱼类以获取“护心”脂肪酸。USDA科学家认为，现行膳食建议可能已过时且不足。
Eat more fatty fish.
That dietary advice has changed the way the world consumes salmon, pushing consumer demand ever upward and production to higher and higher levels. Most of that demand is being met with farmed salmon: Today, nearly 70 percent of the salmon consumed on the planet are raised in pens and cages.
The US Department of Agriculture’s Dietary Guidelines for Americans recommend eating at least 8 ounces of fish a week and urges people to choose salmon or other species that are similarly high in “heart-healthy” Omega-3 fatty acids. But new research led by USDA scientists finds that levels of these fatty acids in farmed salmon have dropped considerably, potentially making the agency’s own advice, and similar recommendations, including from the American Heart Association, outdated and insufficient.
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