You've seen them on labels, but what are natural and artificial flavors anyway? Reporter Sara Joyner explains.See Privacy Policy at <a href="https://art19.com/privacy" rel="noopener noreferrer" target="_blank">https://art19.com/privacy</a> and California Privacy Notice at <a href="https://art19.com/privacy#do-not-sell-my-info" rel="noopener noreferrer" target="_blank">https://art19.com/privacy#do-not-sell-my-info</a>.

CELERY TONIC

We take America's Test Kitchen's inquisitive and relentless approach to telling unexpected, funny, and thought-provoking narratives about food and drink. This is not a recipe show. And this is not a show about celebrity chefs or what they like to eat. Proof plunges into history, culture, science, and the psyche to uncover the hidden backstories that feed your food-obsessed brain. A production of America's Test Kitchen.