There are nine essential amino acids, according to MedlinePlus. These include valine, tryptophan, threonine, phenylalanine, methionine, lysine, leucine, isoleucine and histidine. The essential amino acids cannot be produ... More »

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In humans, there are nine essential amino acids. An essential amino acid is one that cannot be manufactured in the body; it must come from the food humans eat. The other 11 amino acids are considered to be nonessential. More »

According to the ASU School of Life Sciences, 21 amino acids are used by the human body to build all the protein it needs. The exact number of universal amino acids may differ depending on the source, as some give 20 or ... More »

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Essential amino acids are needed for making protein, which the body requires for a variety of functions, states the National Institutes of Health's MedlinePlus. When the diet lacks an essential amino acid, such as lysine... More »

Essential amino acids are amino acids that cannot be synthesized by the body. As a result, humans must obtain these amino acids from food sources. There are nine essential amino acids in total, including histidine, isole... More »

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Many diets are often missing seven essential nutrients that include calcium, fiber, magnesium, vitamin A, vitamin C, vitamin E and potassium. These essential nutrients are necessary to have a healthy diet. More »

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Although individual preferences vary, many people use rice, corn and quinoa as essential foods on a gluten-free diet. These staples can be used to make pasta, bread, cereals and other common foods. More »