If you're Lactose Intolerant and eat dairy...What happens?

What exactly is Lactose Intolerance? Why are some people unable to eat dairy? If you're Lactose Intolerant, does that mean you can never eat ice cream again? Have you started your FREE TRIAL of Who Smarted?+ for AD FREE listening, an EXTRA episode every week & bonus content? Sign up right in the Apple app, or directly at WhoSmarted.com and find out why more than 1,000 families are LOVING their subscription! Get official Who Smarted? Merch: tee-shirts, mugs, hoodies and more, at Who Smarted?