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The Nova framework presents four food groups, defined according the nature, extent, and purpose of industrial food processing applied. [9] Databases such as Open Food Facts provide Nova classifications for commercial products based on analysis of their categories and ingredients. [ 13 ]
The types of food are split into five categories: [5] [6] Plenty of fruit and vegetables (at least seven portions a day). 2–3; Plenty of potatoes, bread, rice, pasta and other starchy foods. 2–3; Some milk and dairy and/or calcium fortified soy milk. 2–3; Some meat, fish, eggs and/or non-dairy sources of protein (like beans and pulses). 2–3
The USDA promoted eight basic food groups prior to 1943, then seven basic food groups until 1956, then four food groups. A food pyramid was introduced in 1992, then MyPyramid in 2005, followed by MyPlate in 2011. Dietary guidelines were introduced in 2015 and slated to be rereleased every five years.
The USDA's "Basic 7" food groups from 1943 to 1956. In 1943, during World War II, the USDA introduced a nutrition guide promoting the "Basic 7" food groups to help maintain nutritional standards under wartime food rationing. [5] [6] The Basic 7 food groups were: Green and yellow vegetables (some raw; some cooked, frozen or canned)
A food pyramid is a representation of the optimal number of servings to be eaten each day from each of the basic food groups. [2] The first pyramid was published in Sweden in 1974. [3] [4] [5] The 1992 pyramid introduced by the United States Department of Agriculture (USDA) was called the "Food Guide Pyramid" or "Eating Right Pyramid".
This latest review observed a 27% reduction in the overall incidence of heart disease when 50 grams (1.8 ounces) of processed meat per day was swapped with 28 grams to 50 grams (1 ounce to 1.8 ...
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As meat cooks, the iron atom loses an electron, moving to a +3 oxidation state and coordinating with a water molecule (H 2 O), which causes the meat to turn brown. Searing raises the meat's surface temperature to 150 °C (302 °F), yielding browning via the caramelization of sugars and the Maillard reaction of amino acids.