4,500 year old yeast, atomic peanuts, and a cheating scandal at a chili cook-off. Season 4 goes even deeper to reveal what’s on our plates and how it got there. Tune in for Season 4 of Proof beginning April 9. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info. Learn more about your ad choices. Visit megaphone.fm/adchoices