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believe that 68 amounts of individual nutrients（营养物） were the 69 to good health,”says Linda Van Horn, chair of the American Heart Association’s Nutrition Committee. “But now we have a 70 understanding of healthy eating and the kinds of food necessary to 71 not only heart disease but disease 72 general,” she adds.
Scientists now 73 on the broader picture of the balance of food eaten 74 several days or a week
75 than on the number of milligrams （毫克） of this or that 76 at each meal.
Fruits, vegetables and whole grains, for example, provide nutrients and plant-based compounds 77 for good health. “The more we learn, the more 78 we are by the wealth of essential substances they 79&nbs
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