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Below is a list organised by food group and given in measurements of grams of protein per 100 grams of food portion. The reduction of water content has the greatest effect of increasing protein as a proportion of the overall mass of the food in question. Not all protein is equally digestible.
Protein quality is the digestibility and quantity of essential amino acids for providing the proteins in correct ratios for human consumption. There are various methods that rank the quality of different types of protein , some of which are outdated and no longer in use, or not considered as useful as they once were thought to be.
The US FDA official methods to calculate the PER are as stated in the Official Methods of Analysis of AOAC International, 16th ed. (1995) Section 45.3.05, AOAC Official Method 982.30 Protein Efficiency Ratio Calculation Method; and Official Methods of Analysis of AOAC International, 18th ed. (2005).
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Fat has a food energy content of 38 kilojoules per gram (9 kilocalories per gram) proteins and carbohydrates 17 kJ/g (4 kcal/g). [ 2 ] Water makes up a large proportion of the total mass ingested as part of a normal diet but it does not provide any nutritional value.
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It was imported to the West under that name in 1969 by the American company Erewhon. [5] The etymology of seitan is uncertain, but it is believed to come from combining the characters 生 (sei, "fresh, raw") and 蛋 (tan, from 蛋白 (tanpaku, "protein")). [2] The meaning of the word "seitan" has undergone a gradual evolution.