They scanned 8,783 brains. The memory tests caught nothing.

Today’s letter

The one food to add to the meal you eat on autopilot

For years I believed that if something were going wrong inside me, I would feel it first. That was the whole system I ran on: a headache meant too much coffee, and tired meant a late night. My body sent the message, I read the message, and I adjusted. It worked well enough that I never questioned it.

Then in the middle of last month I read a paper that took that system apart. It was in the news for about a week, and the headlines were all about ultra-processed food and the brain… which sounded like one more scary story until I sat down with the study itself. What stopped me was not the damage they found. It was who could feel it.

“How was I supposed to know?”

You have probably asked some version of that question. Nobody who knows you would call you careless about your health. You read labels, ask questions at the appointment, and pay attention when your body says something is off. Every piece of health advice you have ever been handed assumes the same thing, which is that you will get a signal.

So you waited for one. Listen to your body, they said. Trust your gut. You will know if something is wrong. And every year the bloodwork came back fine, the doctor said everything looks good, and you took that as the all clear it was supposed to be.

Here’s what gets me. Some of what food does to a body sends no signal at all, and nobody mentions that part. There is nothing to listen for.

You were not ignoring a warning. There was never a warning to ignore.

Which of these 4 vitamins is quietly raising heart risk?

Most people take vitamins to protect their health.

But according to Harvard researchers, one of the most popular vitamins in the world may actually raise blood sugar and increase the risk of heart disease and even cancer.

Millions take it every day, believing it is helping.

Which one do you think it is?

A) Vitamin E

B) Vitamin C

C) Vitamin D

D) CoQ10

When you have your answer, click here to see if you guessed correctly.

The truth may surprise you, and it could save your life.

Let me show you how I know. Not with my opinion, but with a study, and a big one at that.

Researchers at McMaster University and the Population Health Research Institute in Canada pulled together data on 8,783 adults between the ages of 35 and 69. None of them had any history of heart disease. Each one filled out a detailed food questionnaire, had their body fat measured, and then lay inside an MRI machine so the team could photograph the blood vessels of the brain.

They were looking for small areas of damage called vascular brain injury, which includes strokes so small the person never knew one had happened. That part you would expect. The part I did not expect is that the same people sat down on the same visit and took memory and thinking tests.

What they found

McMaster University and PHRI, 2026. de Souza et al., JAMA Network Open.

The scans (more injury at the top of the range)

Vascular brain injury appeared in 11.3 percent of the group eating the most ultra-processed food, against 8.1 percent of the group eating the least. Adjusted for age, income, smoking and the usual risk factors, that is 40 percent higher odds, and 78 percent higher among the women. The authors call that last comparison an unplanned one that other studies will need to confirm.

The memory and thinking tests (no difference)

Scores came out about the same across all four groups. Nobody in that room could feel what the scan was picking up, and nothing they noticed about themselves would have told them.

The scan picked up something the women could not feel, and the tests could not catch either.

In other words, the signal you were told to listen for was never there to hear. A scan could tell those groups apart. Memory and thinking tests could not, and neither could the women living in those bodies.

Your willpower had nothing to do with this. Neither did how closely you were paying attention.

So how does a box of cereal end up anywhere near the blood vessels of the brain?

Ultra-processed food is built for shelf life and speed, not for blood vessels. The people eating the most of it in this study also carried more body fat and more deep belly fat, and that kind of fat is linked to inflammation and to damage in small vessels. That is the pathway the researchers suspected, though they could not confirm it here, and the link to the scans held even after they accounted for body fat. What the authors did point to is simpler. The packaged food appeared to crowd out the whole food, so what was missing from the plate may matter as much as what was on it.

You never stood a chance of catching this on your own. Neither did I, and I read these papers for a living. Nothing in a mirror, a mood, or an energy level reports on the inside of a blood vessel.

That’s the part no one says out loud… the advice to listen to your body only works on the things your body talks about. And this was never one of them.

Try this today

Pick the one meal you eat on autopilot, the same way most weeks, probably breakfast or lunch at your desk. For the next seven days, put one whole food on the plate beside it and eat that part first: a pear or a handful of baby carrots next to the sandwich, a boiled egg with the cereal, a cup of frozen peas tipped into the soup while it heats. No food comes off the plate, and nothing is banned.

This is the whole hack. The whole food gets there first, and nothing has to leave.

Promise me you’ll try it today? Saying it out loud is half of what makes it stick.

I’m in. I’ll try it today →

None of this is magic, and one pear will not undo a decade of lunches. But the crowding out the researchers described runs both ways, so every whole food you add is room the packaged food does not get.

I changed one meal after I read this paper. My desk lunch now has an apple sitting next to it, which is not a transformation of anything… but it is one more thing on the plate that the study pointed at. I stopped waiting to feel a reason first.

You can stop waiting too. There is still time for you, and the long-term research on this is still being written.

…because you were never given anything to go on.

It was never your fault.

— Cole

P.S. What time do you eat the meal you never think about? Just the hour. Hit reply, and tomorrow I’ll tell you the hour most people sent back.

Which of these 4 vitamins is quietly raising heart risk?

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