The truth is that it's in many products bought at the grocery store. Diet or not. However, it is in higher quantities in foods labeled, diet, keto, low-carb, etc. As always, check the label for the ingredients. I did find out that both Diet Coke & Pepsi did not have this in it. Their alternatives bring their own dangers.

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Erythritol is found naturally (in small amounts) in fruits and mushrooms, as well as in fermented foods such as wine, soy sauce, sake, and miso.

Industrially, it can be produced from corn or wheat starch by fermentation with yeast. Its sweetness level is about 75-80% that of sugar.

Sugar-free gum

Sugar-free candy

low-carb Baked goods, such as cookies, cakes, and muffins

Ice cream and frozen desserts

Protein bars and shakes

Breakfast cereals and granolas

Diet Soft drinks, juices, and energy drinks

Yogurt and other dairy products

Jams and jellies

Chocolate and other confectionery products

Many brands of tabletop artificial sweeteners such as monk fruit, Lakonta, Swerve, Sukrin, and Truvia.

Products listed as Keto

Truvia, Splenda, Vitamin Water Zero, Gatorade G2 Natural and Halo Top Ice Cream, Atkins Bars and other products.

https://www.dovel.com/what-we-do/mass-torts/erythritol/