Hi, it's Mark Sisson from Marksdailyapple.com.

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Does coffee break a fast?

This has got to be one of the most frequent questions I see.

Does coffee break a fast?

Let's answer.

To begin with, I'll make the case that you shouldn't worry too much about this stuff.

That you're even willing and able to go without a meal or snack for 12 to 24 hours places you

in rarefied company. That's 95th percentile stuff. You're ahead of the game simply by being

open to the idea of not eating every hour. Take hard in that.

Some coffee with cream midway through doesn't take away from what you're accomplishing.

But I know you guys, and I know you love the minutia. I know it because I love it too. It's fun,

even if it gets us into trouble sometimes. So let's dig right in.

First, does black coffee break a fast? Put another way, does coffee interfere with the benefits

we're seeking from a fast? Depends on the benefits you're seeking and what you put in the coffee.

Let's look at five of the most common benefits first and if and how coffee affects them. Number one, ketosis. Fasting is a quick

and easy or simple way to get into ketosis. You have little choice in the matter. Since you're not eating anything and your body

requires energy, you break down body fat for energy. And because you've only got fat coming in,

you'll quickly start generating ketone bodies. If coffee stops ketosis, it's probably breaking

the fast. A recent study found that taking caffeine acutely upregulates ketosis in humans.

...