September 1, 2026

They knew it tasted bad

Researchers gave moviegoers either fresh popcorn or popcorn that was seven days old. Stale and genuinely unpleasant.

Here’s what happened. People with strong movie-popcorn habits ate just as much stale popcorn as fresh.

When asked to rate it, they agreed it tasted bad. They ate it anyway.

This reveals something important.

We assume taste drives what we eat. But for many foods, habit overrides preference entirely.

You might think you eat that cookie every afternoon because it’s delicious.

But you may eat it simply because you always eat it when you sit in front of the TV or kick off your shoes after work.

The behavior is on autopilot.

The researchers tested a simple disruption.

They had some participants eat with their non-dominant hand.

That small change was enough to break the automatic pattern. People with strong popcorn habits suddenly ate far less of the stale stuff.

The implication for your eating is clear.

Minor changes to your routine can weaken unwanted automatic eating.

Eat without a screen.

Take a different route home so you don’t pass the drive-through. Use your non-dominant hand for snacks.

You’re not fighting your love of certain foods. You’re interrupting conditioning. The automatic pattern loses power when the context shifts.

Try this:

Identify one food you eat automatically in the same place or time each day. Change one thing about the context this week.

I hope this helps.

—Keith

KeithAHerman.com

If you have questions or topics you’d like me to address in future emails, you can reply to this message. I read and respond personally to all replies.

Keith A. Herman is the founder of the Expert Diet Project, an initiative dedicated to correcting health misinformation by spotlighting the advice of the real experts.

The Eat Like an Expert Newsletter, the Health & Well-Being Journal, and Keith’s upcoming book, Eat Like an Expert, are all part of the Expert Diet Project. The book is scheduled for release in 2026.

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