Will Bulsiewicz MD MSCI@theguthealthmdInstagram

You’re probably drinking your coffee too early. ☕ This one habit could be messing with your gut motility

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what it claims

Drinking coffee too early in the morning disrupts intestinal motility, energy levels, and cortisol rhythm.

overstated

The idea that caffeine influences cortisol is scientifically grounded: caffeine consumption can effectively increase cortisol levels temporarily, a response that is often more…

noli's read

The idea that caffeine influences cortisol is scientifically grounded: caffeine consumption can effectively increase cortisol levels temporarily, a response that is often more pronounced in individuals who already have high natural cortisol upon waking (Meta-analysis, Lovallo et al., 2005). Regarding intestinal motility, caffeine is a known colon stimulant, which can accelerate transit in some individuals (Observational study, Rao et al., 1998). However, asserting that consuming coffee "too early" systematically dysregulates these systems for the general population is an exaggerated interpretation. While waiting 60 to 90 minutes after waking may theoretically allow the natural morning cortisol peak to stabilize, the actual impact on overall health remains highly variable from one person to another. There is no major clinical consensus defining a universal "wrong" time for coffee. The assertion transforms an individual physiological sensitivity into a generalized wellness rule.

the sources

1Lovallo WR, Whitsett TL, al'Absi M, et al. 2005

Claimed by Will Bulsiewicz MD MSCI. Noli grades the claim, never the person.

Decoded by Noli · July 18, 2026 · the original post

What the graded evidence says

Evidence: D

Linked to, not proven to cause.

Effect: cortisol response to caffeine across the waking day; direct evidence that delaying morning caffeine improves outcomes — caffeine measurably raised cortisol (largest in non-habitual users); no direct trial evidence that a 90-120 min delay improves energy, focus, or sleep
Measured on: healthy adults (caffeine-cortisol data); no population tested for the delay claim itself

The morning-delay idea is a mechanistic hypothesis, not a tested practice. Only the caffeine-cortisol link is measured; the benefit of postponing the first cup is unproven.

Will Bulsiewicz MD MSCI in the Register46 claims graded · solidity 87/100See their record →