Download [Magazine] Scientific American. Vol. 297. No 3 PDF

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Extra resources for [Magazine] Scientific American. Vol. 297. No 3

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In the early 1970s Danish investigators observed surprisingly low frequencies of heart disease among indigenous populations in Greenland that typically ate fatty fish, seals and whales. The researchers attributed the protective effect to the foods’ content of omega-3 fatty acids. Some subsequent studies — but by no means all— confi rm this idea. Because large, fatty fish are likely to have accumulated methylmercury and other toxins through predation, however, eating them raises questions about the balance between benefits and risks.

Food companies pay supermarkets to get their products — salty chips and other junk foods — positioned prominently in huge displays. Checkout lines are plastered with candy and other junk food items — the last temptation. Sodas and Obesity Sugars and corn sweeteners account for a large fraction of the calories in many supermarket foods, and virtually all the calories in drinks — soft, sports and juice — come from added sugars. In a trend that correlates closely with rising rates of obesity, daily per capita consumption of sweetened beverages has grown by about 200 calories since the early 1980s.

Department of Agriculture in 1992 beneficial or not, it was at least simple to use. The familiar triangular nutrition guide suggested how much of each food category — grains, dairy products, fruits and vegetables, meats and fats, oils and sweets — one should eat every day. But in my opinion, the USDA’s 2005 replacement, MyPyramid, is a disaster. The process the agriculture agency employed to replace the 1992 food pyramid ( left) has been kept secret. It remains a mystery, for example, just how the department came up with a design for a new food guide that emphasizes physical activity but is devoid of food (right).

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