Cardiology: Four Fats in the Blood: Which Cause Heart Attacks?

Every week for the past year, more than 1,100 couples in five U.S. cities have selected a seven-day supply of food from a carefully drawn list and then sent their orders to Washington. Processed by a computer, the orders go back to shipping offices in the five cities, and the food is delivered. Container labels give no clue to the precise ingredients in such items as salad dressings, cake mixes and milk concentrates.

The computerized menus represent no attempt to automate a housewife's traditional chore. They are part of a serious and important...

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