What Is Keto? Trendy Diet Allows for Plenty of Cheese and Fat

But before attempting to tackle keto on your own, Mattinson encourages people to talk to their doctors.

“A diet that eliminates entire food groups is a red flag to me. This isn’t something to take lightly or dive into headfirst with no medical supervision,” Mattinson told Everyday Health.

This story has been updated with additional information about ketosis.