Decision Fatigue: Why Founders Run Out of Good Decisions by 3pm

By 3pm, the question “What do you want for dinner?” can feel like an unreasonable demand.

You’ve approved designs, answered your team, chosen a supplier, rescheduled a call, decided what to post, replied to a client, signed a permission slip and remembered the dog’s worming tablet. Now someone wants one more decision, and your brain says no.

That feeling has a popular name: decision fatigue. Here’s what the research actually says, why founders feel it more, and how to make fewer decisions so your best thinking goes where it matters.

What is decision fatigue?

Decision fatigue is the idea that the quality of your decisions gets worse after you’ve made a lot of them. You start avoiding choices, defaulting to the easiest option, or making snap calls you regret.

Most founders recognise the feeling straight away. The science behind it is more complicated than the internet suggests, and it’s worth knowing why.

What does the research really say?

Two well-known pieces of research are worth looking at together.

The hungry judge study

In 2011, researchers studied Israeli parole boards and found favourable rulings dropped from about 65% at the start of a session to nearly zero before a food break, then jumped back up afterwards. It became one of the most quoted studies in psychology.

But other researchers pointed out that cases weren’t heard in random order. Prisoners without lawyers, who were less likely to be paroled, tended to be heard at the end of each session. That ordering may explain much of the pattern. The original authors disputed this, but the debate means the study isn’t the clean proof it’s often presented as.

The “willpower is a fuel tank” idea

Decision fatigue is often linked to “ego depletion”: the idea that self-control is a limited resource that runs out with use. In 2016, a project across 23 laboratories with more than 2,000 participants tried to replicate a standard ego depletion experiment. The effect was close to zero.

That doesn’t mean mental effort isn’t tiring. It means the simple “you have a fixed number of good decisions per day” story isn’t well supported.

So why do decisions feel so draining?

Even if the fuel tank model is shaky, there are good reasons decisions wear you out.

• You’re tired. Decisions made on poor sleep, low food and high stress are harder.
• Decisions come with emotions. Choosing means disappointing someone, taking a risk or carrying responsibility.
• Interruptions break your focus. Switching between a pricing decision and a lunch order is hard on anyone.
• You’re carrying a hidden load of planning and remembering.

Why do founders and mothers feel it more?

Founders make more decisions than most people, and many of them land on one person. If you also run a household, there’s another layer.

Sociologist Allison Daminger interviewed 35 couples about the thinking work of running a home. She described four parts: anticipating needs, identifying options, deciding and monitoring. Women in her study did more of this work overall, especially the anticipating and monitoring. Interestingly, the deciding part was more evenly shared. That means women often do the invisible work of noticing and following up, which doesn’t even feel like “deciding” but still fills your head.

The four parts of the mental load

In a business, it’s the same. Founders anticipate problems, find options, decide and then check everything got done. When nobody else holds any of those steps, you hold all four, all day.

How can you make fewer decisions?

These five strategies reduce the number of decisions you make, which is useful whether or not decision fatigue works exactly as the popular story says.

1. Set defaults

Decide once, then stop deciding. A standard breakfast. A capsule work wardrobe. A weekly meal rotation. A default reply for common requests. Every default removes dozens of tiny decisions. Defaults can feel boring at first. That’s the point. Boring choices leave room for interesting ones.

2. Batch decisions

Instead of approving things as they arrive, set one or two decision windows a day. Your team brings everything to that slot. You decide in a focused block instead of all day in fragments.

3. Delegate decision rights, not just tasks

Delegating a task but keeping every decision means you still hold the load. Give your team clear rules: “Anything under $500 that fits the brand, you decide.” Then let them, and resist the urge to quietly redo their choices.

4. Hand over the anticipating and monitoring

At home and at work, ask someone else to own the whole cycle of a responsibility, from noticing it to checking it’s done. That’s where most of the invisible load sits.

5. Make big decisions when you’re sharpest

Notice when you think most clearly, often the morning for many people, and keep that window for strategy, pricing and hiring. Leave admin for when your energy is lower.

What does a low-decision day look like?

Here’s an example of how the five strategies fit together in one working day.

A low-decision day (example) 7am | Default breakfast. Work clothes chosen the night before. 8:30am | Your sharpest block: one big decision, such as pricing or a hire. No inbox. 11am | Decision window one: your team brings everything that needs a yes or no. 12:30pm | Default lunch from your weekly plan. 1:30pm | Calls and collaborative work. Anything under your agreed limit, your team decides. 4pm | Decision window two. Anything not urgent waits until tomorrow’s window. 5:30pm | Shutdown. Dinner is already on the meal plan.

It looks rigid on paper. In practice it feels lighter, because the small choices have already been made and your head is free for the ones that matter. Start with one or two pieces, such as a default breakfast and a single decision window, and build from there.

Is it decision fatigue, or something bigger?

If every decision feels heavy, all day, every day, it may be more than too many choices. Exhaustion, brain fog and avoidance are also signs of burnout, low iron, poor sleep, depression and hormone changes. If you’ve felt this way for more than two weeks, see your GP.

Where does this fit in my EDGE framework?

The D in my EDGE framework stands for Decide: decisions, boundaries and mental load. It sits alongside Eat, Ground and Exercise because doing everything right with food and movement may not be enough if your head is carrying too much. Hormone Magic introduces the Decide pillar, and the deeper work happens inside the Conscious Founders Club, where founders rebuild how they decide, delegate and lead. The Conscious Founders Club is my 12-week group coaching experience for founders, CEOs and high-performing women, with six frameworks and live group calls every two weeks.

“As a businesswoman and CEO of multiple companies, the capacity I can now hold has changed dramatically.”

To cut the number of decisions at the source, try the audit in how to run a business without burning out.