An Australian study just confirmed something I had already felt in my own head.

There's a part of my old story I haven't told you yet.

I've written here about my body. The weight, the lab report, the parking lot, the cardiologist. But there's another piece I left out, because for a long time I didn't have the words for it. The truth is that before I changed how I ate, my body wasn't the only thing that wasn't working. Something else was off too. Something quieter, harder to point at.

My head felt slow.

Not in a way I could explain to anyone. It wasn't that I was forgetting things. It was that I couldn't quite stay with anything. I'd start reading and lose the thread halfway down the page. I'd sit in a meeting and feel like the conversation was happening behind a curtain. I'd open my laptop with three things to do and end up doing none of them, just clicking around, eating something out of a bag, telling myself I'd start in a minute. By three in the afternoon I was useless. By night I was wired and tired at the same time.

I thought that was just life. I thought that was just me. The classic happy fat guy isn't only carrying extra weight on his body. He's also carrying a kind of fog he stopped noticing because it had been there for so long.

And then I read about a study from Australia, and I had to sit with it for a while.

What the study actually found

In April of this year, researchers from Monash University, the University of São Paulo, and Deakin University published a study in Alzheimer's & Dementia, the journal of the Alzheimer's Association. They followed 2,192 Australian adults between the ages of 40 and 70, all of them dementia-free, all of them part of something called the Healthy Brain Project.

On average, those people were getting 41% of their daily calories from ultra-processed foods. Things made in factories with ingredients you can't pronounce. Snacks, frozen meals, sodas, packaged breakfast cereals, anything that comes pre-assembled in a wrapper.

What the researchers found is this. For every 10% more of those foods in a person's diet, their scores on standard attention tests went down in a measurable way. Visual attention. Speed of processing. The basic ability to focus and to think quickly. The effect held up even when they controlled for whether the person otherwise ate a healthy Mediterranean diet. Which means the problem wasn't only about what was missing from the plate. It was about what the processing itself was doing.

The researchers think the suspects are the additives. The emulsifiers, the cosmetic colorings, the industrial flavorings, the things added not for nutrition but to make a product look, feel, and last in a way that real food never could.

I'm not going to overstate what the study says. It doesn't prove cause and effect. It's a snapshot, not a film. The researchers themselves are careful about that, and so am I. But what it does show, with more than two thousand people, is a clear pattern. The more your diet looks like a supermarket aisle, the worse you score on the part of your brain that lets you stay sharp.

The part that hit me

When I read that, I thought about my afternoons. The slow ones. The ones I blamed on age, on stress, on bad sleep, on being a busy guy with kids and a business. I thought about the fog I had stopped naming because I had stopped expecting anything different.

And I thought about something else. When I changed the way I ate, when I went back to real fats, real meat, real vegetables, when I stopped opening packages and started cooking again, I lost the weight. You know that part of the story. But I also got something back that I hadn't realized I'd lost.

I could think.

The fog lifted. Not all at once, but it lifted. I could read a long article and finish it. I could sit through a meeting and actually be in it. The afternoons stopped being a wall I had to push through. I had energy that didn't crash. I had attention that didn't drift.

For a long time I assumed that was just a side effect of losing weight. Maybe it was, partly. But after reading this study I think there was something else going on. I think the food I had been eating for years, the easy food, the food that comes ready, was quietly costing me something I never even knew was on the bill.

I'm not a doctor. I'm telling you what I noticed.

You know by now that I don't pretend to be a scientist. I'm a guy who changed his food and changed his life, and I'm trying to be honest about all of it, not just the parts that are easy to measure.

So I'll tell you what I think, knowing it's only what I think. The reason a bag of chips, a frozen dinner, a packaged cereal, a bottled sauce, the reason these things scare me now is not only the calories or the seed oils or the sugar, although those are bad enough. It's that I no longer believe my brain was meant to run on this stuff. I lived for years inside that fog. I don't want to go back.

What I do now is simple. I cook. I open a jar of ghee, I melt a spoonful of tallow in a pan, I cut real vegetables, I eat real meat. Almost nothing in my kitchen comes in a wrapper anymore. And the brain I have today, the one writing this for you, is not the same brain I had five years ago, sitting in that parking lot, staring at a lab report I didn't want to read.

If you've ever felt that fog and assumed it was just you, just life, just getting older, I want you to know what I now believe. It might not be you. It might be what's on your plate.

Fat never felt so right.

Gustavo Rodriguez, Founder