Oddly Wired
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decision making

You are less rational when you are hungry.

The theory that self-control is a limited metabolic resource fueled by blood glucose has been widely challenged and failed to replicate in large-scale studies.

Evidence suggests that the 'ego depletion' effect is not a reliable psychological phenomenon, and the brain does not function as a simple fuel-limited device regarding self-control.

Your best decisions are rarely made when you are empty.

Where this comes from

Study
Gailliot et al., 'Self-control relies on glucose', 2007
What the check found
The 'ego depletion' theory and its glucose-linked mechanism are largely considered discredited or at best highly controversial in modern psychology due to replication failures.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.