Pop quiz: What's the latest breakfast ingredient to gain a cult-like following?

A. Something green

B. Something that requires at least two postgrad degrees to pronounce

C. Butter

The correct answer is C. Surprised? Here's what you need to know:

What is it? Bulletproof Coffee is made of coffee blended with grass-fed butter and a medium-chain triglyceride (usually coconut oil). The drink allegedly suppresses hunger, promotes weight loss and supplies mental clarity.

Does it work? According to the drink's disciples (Hollywood types, tech tycoons, even athletes), bulletproof coffee can do no wrong. Per its detractors, it's just another trend. (Anyone remember the grapefruit diet?)

But how does it taste? The jury's still out. Reports range from creamy, delicious and latte-esque to sludgy, oily and please-get-out-of-my-mouth-y.

So should I try it? Maybe. If your diet is already high in fat and low in carbs, Bulletproof Coffee could be for you. One cup won't hurt, though, so if you're one to get in on trends, by all means give it a try.

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