""You need about 40 different nutrients to stay healthy," the guidelines said. "Most foods contain more than one nutrient. Milk, for example, provides proteins, fats, sugars, riboflavin and other B-vitamins, vitamin A, calcium, and phosphorus - among other nutrients." But it doesn't have much iron or vitamin C. "You should, therefore, eat a variety of foods to assure an adequate diet.""
"Here, grains like bread, cereal, rice, and pasta were touted as the foundation of a balanced diet - the recommendation in the chart was six to 11 servings of grains per day. The second priority, you were told, was to add in at least two to three servings of fruits and veggies each day. Finally, layer on top some protein from meat, eggs, beans, and nuts, as well as dairy."
Federal dietary guidance began in 1980 in response to rising chronic diseases linked to modern eating patterns, including heart disease, cancer, strokes, high blood pressure, diabetes, and obesity. The initial guidance stressed variety across fruits, vegetables, whole grains, dairy, meat, eggs, and beans and noted the need for about 40 different nutrients, using milk as an example of a multi-nutrient but incomplete food. In 1992 the first food pyramid made grains the foundation with six to 11 daily servings, placed fruits and vegetables as secondary, and relegated fats and sugars to a side note. Nutrition experts later judged the grain recommendation excessive.
Read at Business Insider
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