methionine

is one of the essential amino acids that we require from food. Broken down, it produces homocysteine; B-vitamins are required to convert homocysteine back to methionine. High levels of methionine can be found in sesame seeds, Brazil nuts, fish, meats, and dairy products. Most fruits and vegetables contain very little -- spinach, potatoes, and boiled corn are some of the exceptions. Methionine is also found in beta-amyloid, and has been suggested as being the source of the toxic free radicals produced by amyloid-beta peptides.

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