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Years ago, I told a teammate, "Once I’m done with this project, I’m finally going to have so much free time."

He laughed. "No, you’re not. You’re just going to fill that time with something else."

He was sure right. And now we’re seeing our workloads instantly expand to fill the time our AI tools just saved us. 

We were promised AI would buy us time. But because AI makes us faster, our default human reaction is to immediately fill that saved time with more work. We spin up more agents. We toggle between more interfaces. We review more output.

Instead of saving time, we are just working harder to manage the tools than to actually do the work. And what results is a very specific, modern flavor of exhaustion.

A recent study in Harvard Business Review¹ just put a name to this phenomenon: "AI Brain Fry."

Researchers found that when workers oversee multiple agents or aggressively fact-check complex outputs, they experience a literal mental fog, increased errors, and a massive spike in decision fatigue.

Here is the science of why this happens. Cognitive Load Theory says that your working memory—the part of your brain that processes information in real-time—has a strict, hard biological ceiling. 

When you rapidly toggle between three different AI tools, reviewing drafts and hunting for hallucinations, you blow past your biological limits. You end up making worse decisions and more errors, creating the exact scenario you were trying to avoid by using AI in the first place.

Part of doing your best work is knowing how you do your best work.

In psychology, this is called Interoceptive Awareness—your brain’s ability to perceive internal physiological signals. It’s your internal radar. A fascinating study out of Cambridge University² looked at financial traders working in highly volatile markets. They found that the traders with the highest interoceptive awareness made significantly better, more profitable decisions under extreme stress.

Why? Because they didn't ignore their biology. They could physically feel their cognitive load maxing out before their judgment became compromised.

This week, we are going to run an AI Brain Fry audit to help you understand what causes it for you.

First, pay close attention to your body. When you are toggling between tools or managing AI outputs, what does your specific AI Brain Fry feel like? Is it a thick glaze covering your eyes? A buzzing inside your brain? Sudden, irrational impatience? Learn your body's early warning signs.

The second you feel that physiological signal, stop. Do not close the tabs yet. Take note of your exact environment:

If you do this just two or three times this week, a pattern will emerge. You might realize your absolute biological limit is 45 minutes of overseeing two agents on technical work, or that fact-checking burns you out twice as fast as brainstorming.

The prevailing story around AI is that we should now be capable of endless output. Just spin up another agent and keep chugging along.

But we are still managing those agents. We are still reviewing that output (or at least, we should be). We are still using our brains (thankfully).

And our brains have hard biological limits.

Knowing your cognitive limits is just as critical as knowing your strengths. Once you recognize your own recipe for Brain Fry, you can anticipate the wall before you hit it—ensuring that when it’s time to make the hard decisions, you actually have the mental clarity to make them.

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