Mayo Clinic Minute: Why the 'bulletproof coffee' trend isn't a magic bullet

Katherine Zeratsky is a dietitian nutritionist at Mayo Clinic. She says a little cream in your cup can add flavor and satisfying creaminess, but the "bulletproof coffee" trend has some holes in it.

A tablespoon or two of butter and coconut oil can instantly take that cup of coffee from 0 calories up to almost 500 calories.

And it’s not just the calories. Butter and coconut oil are primarily a saturated type of fat.