Why You’ll Find This Disclaimer on Every Diet Soda

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Why does every diet soda or pack of gum contain a message about phenylalanine? It's an important nutrient for most people's diets, but the disclaimer is critically important information for people living with a disease called phenylketonuria.

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Sources:
https://medlineplus.gov/lab-tests/phenylketonuria-pku-screening/
https://medlineplus.gov/ency/article/002222.htm
https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/phenylalanine
https://www.sciencedirect.com/science/article/abs/pii/S1096719218302920?via%3Dihub
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6763965/
https://www.gimjournal.org/article/S1098-3600(21)04648-7/fulltext
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3838532/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7286632/
https://www.sciencedirect.com/topics/neuroscience/phenylalanine

Image Sources:
https://commons.wikimedia.org/wiki/File:Phenylalanine_warning_for_phenylketonurics.jpg
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https://www.gettyimages.com/detail/video/diet-soda-drink-in-restaurant-with-ice-stock-footage/1202149249
https://commons.wikimedia.org/wiki/File:Phenylalanine_hydroxylase.jpg
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