Does coffee raise blood sugar? Preliminary findings

A few weeks ago, I started an experiment to better understand how different foods and lifestyle decisions impact blood sugar, using a constant-glucose-monitoring device.

Right now, I’m testing what effect drinking coffee has on blood-sugar levels.

Here’s the preliminary data:


The blue line is the blood glucose on a day I drank coffee. The red line is on a day without coffee. As you can see, the blood-sugar levels are on average higher when drinking coffee than when not (I added nothing to the coffee).

To reduce the probability that this difference is random, I’ll repeat the experiment this week.

What do you think will happen? On days when drinking coffee will the blood sugar be (on average) higher, lower or the same? Leave your guess in the comments below.

We’ll share our findings in a few days.

Earlier experiments

Are you interested in our earlier tests? Check out the series:

  1. Why You’re Not in Ketosis
  2. How Much Protein Can You Eat in Ketosis?
  3. What to Eat in Ketosis
  4. Do Artificial Sweeteners Affect Blood Sugar?

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