Eddie Morra is stuck.

He is a writer who can’t write a line.

Then an old friend hands him a clear pill on a New York street.

One swallow and the room goes sharp… each book he ever skimmed comes back word for word.

He picks up piano in three days.

That’s the film Limitless, and the pill is fake.

But one part of that scene has a lab behind it.

It’s the part where his memory comes back to life.

// Deep Dive

Your Memory Runs on Plants

Deep in your brain sits a small curl of cells called the dentate gyrus.

This spot helps you tell a new face apart from one you met last year.

Back in 2014, a team at Columbia put that spot under a high-res scan.

They gave 37 adults, aged 50 to 69, a cocoa drink packed with flavanols.

A second group got a drink with next to none.

After three months, the high dose group had a busier dentate gyrus.

And their scores on a memory test rose with it.

Lead scientist Scott Small put it in plain terms. A typical 60-year-old memory looked more like a 30- or 40-year-old’s.

That was a small trial, so the lab went big.

By the way, I spend over $20,000 a year on the kind of deep research hedge funds pay for.

Most of what I read goes in the bin.

This one got through my filter for three plain reasons.

It had a dummy pill, it ran for years, and it passed peer review.

So I tried it on myself. A cup of green tea and an apple with lunch, most days, for a month.

I feel sharp, though one man is not a study.

Here’s the thing.

Small said flavanols did nothing for folks who already got enough.

In other words, this is not a magic pill.

It’s more like topping up a tank that runs low.

If your plate is light on tea, fruit and berries, you may have room to gain.

Eat that way already? Your brain is likely well fed.

Where Flavanols Live

The top food sources are tea, apples, berries and cocoa.

Sad news for chocolate fans, though.

Most of the flavanols in cocoa get lost when it is made into a candy bar.

Want a number to aim for?

A 2022 guideline from the Academy of Nutrition and Dietetics set 400 to 600 mg a day for heart health.

That range sits right on top of the dose in the memory trial.

Two wins for one habit… I like those odds.