It’s 1959 and Ruth Desmond, the gurney-climbing, cook-from-scratch co-founder of the Federation of Homemakers was prowling the halls of the FDA, about to earn her “peanut butter grandma” namesake. She stumbled upon this unassuming, but ultimately history-changing memo. It was four little paragraphs, a proposal to regulate one of the most popular foods in the country.

The government was trying to answer an existential question: how many additives can you put into a jar of peanut butter before it’s not peanut butter anymore? Trying to answer it kicked off a years-long battle that upended the, uh, peanut butter industrial complex. And honestly? Battles like this are how a lot of regulations get made in this country.

Welcome back to The Uncertain Hour. Where the things we fight the most about are the things we know the least about. Subscribe on Apple Podcasts, or your favorite podcast app.