Thursday lunch.

I set two slices of white sandwich bread on a plate. Nothing on them. No toaster, no butter, no cheese. Just plain bread from the bag on the counter.

I wanted a clean test.

Forty minutes later, my glucose monitor showed my blood sugar had climbed 72 points.

By midafternoon I felt off... foggy. My hands were in the kitchen cabinet before I knew why. That heavy, restless drop when blood sugar falls below where it started.

That part was not new.

But this was. Last week a team at the University of Colorado published a trial in the New England Journal of Medicine. It was the first standalone real-time continuous glucose monitor study the journal had run in close to 20 years. The researchers enrolled 283 adults with type 2 diabetes, none of them on insulin, across 22 primary care clinics. Half got a monitor to wear for six months.

The study was funded by Dexcom, the glucose monitor's maker. The result still held: people who could see their blood sugar in real time spent about five extra hours a day inside their target range.

And 97 percent were still wearing it at the end.

Seeing the number changed the number.

So on Friday I ran the test again with the same bread. Two slices, nothing on them. But this time, within a minute of my last bite, I walked out the front door.

Ten minutes around the block.

My blood sugar rose 42 points. No crash. No fog.

Thirty points lower, from the same bread.

Two days, two slices each time. The only thing that changed... whether I walked.

This is one person's experiment, not medical advice. Everyone's body responds differently.

When you walk after eating, your leg muscles pull sugar straight out of the blood. They do this through a pathway that works on its own, without waiting for insulin. A review published in Physiological Reviews confirmed this: when muscles contract, they absorb blood sugar through a route that is completely separate from the one insulin uses. So the sugar from the meal is arriving in the blood at the exact moment your muscles are burning it.

In other words... your muscles catch the sugar right as it peaks.

A team at Ritsumeikan University in Japan tested this in a study published in Scientific Reports last year. Twelve young adults drank the same glucose drink on three separate days. One day they sat still. Another day they walked for 10 minutes right after drinking it. On a third day, they waited 30 minutes, then walked for 30.

Only the immediate walk cut the peak.

The delayed walk lowered the total blood sugar rise over two hours. But the peak was just as high as sitting. Timing mattered more than distance.

An older study, published in Applied Physiology, Nutrition, and Metabolism in 2009, found something similar. Fourteen women ate a carb-heavy meal and then walked at their own pace. Nothing strenuous. The rise in blood sugar was lower than when they sat. And the longer they walked, the more it helped.

But even a short walk right after the meal made a difference.

The protocol is simple.

After dinner on Friday my son looked across the table. I stood up. He said, "Walk?"

He is eight. He has no idea what a glucose monitor is, or why I wear one on my arm. He just knows I go for a walk after dinner sometimes.

We went around the block. He told me a kid at school can hold his breath for two minutes. I said that seemed unlikely. He said I am wrong about a lot of things.

He might be right about some of them.

The American Diabetes Association's current guidelines recommend breaking up prolonged sitting at least every 30 minutes for blood sugar benefits. Brief post-meal activity, even a few minutes of walking, is one of the simplest ways to lower the after-meal rise. That recommendation covers people with prediabetes and diabetes alike.

This is the cheapest hack we have tested.

No pill, no powder, no subscription. A pair of shoes and the front door.

I do not know if 10 minutes works the same for every person and every meal. The studies are small. But 30 points off two slices of white bread is hard to argue with.

And the walk with my son was free, too.

Stay steady