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“All the more recent work on alkaptonuria has... strengthened the belief that the homogentisic acid excreted is derived from tyrosine, but why alkaptonuric individuals pass the benzene ring of their tyrosine unbroken and how and where the peculiar chemical change from tyrosine to homogentisic acid is brought about, remain unsolved problems.”
― Archibald E. Garrod

“We can influence dopamine production through our diets. You can’t actually eat dopamine, but you can eat the thing that makes it—tyrosine. It is a nonessential amino acid, meaning that you must consume it in your diet because your body doesn’t make its own. However, before you start rushing out to the supermarket to get a cart full of tyrosine—cheese, soybeans, beef, lamb, pork, fish, chicken, nuts, seeds, eggs, dairy, beans, and whole grains—research shows that it really only helps if you’re deficient to begin with.”
― Simon Marshall, The Brave Athlete: Calm the F*ck Down and Rise to the Occasion