Consider it as risky as unwashed lettuce.
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When I was a kid, my Grandma would entertain the grandkids by making Play-Doh from scratch. She'd mix flour, water, salt, food coloring, and a few other items from the pantry, and it would magically become Play-Doh. It was fun to mold and sculpt and, at least according to my little brother, delicious to eat.

He really shouldn't have eaten it. Not just because we had all had our dirty hands all over it, but because it was made of raw flour. People just don't know that eating raw flour isn't safe.

While many of us grew up playing with or even eating raw flour in unbaked cookie dough, pizza crusts, or, if you're my brother, homemade Play-Doh, the Food and Drug Administration strongly discourages it.

"People don't think of raw flour as being a concern," Jenny Scott, a senior adviser in the office of food safety at the FDA Center for Food Safety and Applied Nutrition told Live Science in 2016.

While the risk is low, it's very real. The CDC issued a warning back in 2016 after an outbreak of E. coli that sickened at least 42 people in 21 states was traced to a batch of General Mills flour sold under the brand names Gold Medal, Gold Medal Wondra, and Signature Kitchens. While the outbreak triggered a recall, fast forward a few years and people still don't seem to recognize the risk from eating raw flour, even though the FDA warns consumers about it.

The reason flour is risky to eat is because while it looks like a powder, it's as much of a raw food as lettuce or carrots. Flour is made from grains that are grown in fields where they may be exposed to a variety of harmful bacteria like Salmonella and E. coli. The processing that flour goes through to convert from plant to powder doesn't kill them. And unlike lettuce or carrots, you can't wash flour to clean it.

Two recent studies shared by the site Food Safety News highlight the fact that consumption of raw flour is a real threat to public health. In fact, the Centers for Disease Control and Prevention (CDC) list "raw flour" as one of their seven main groups of foods that can cause food poisoning, and there have been many E.coli outbreaks in the past decade that have been linked to raw flour. 

Those recent studies suggest that Americans need to be better educated on how to safely handle flour, so, let us be clear: Eating raw flour is really risky. The CDC has an entire web page about the dangers with the evocative title of Say No to Raw Dough. The main takeaways are not to eat raw dough or batter (even cookie dough); always wash your hands, tools, and countertops after handling raw flour or dough; and don't let kids play with raw dough or homemade Play-Doh—and definitely don't let them eat it.