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Dr Will Bulsiewicz says measurable microbiome changes can begin within 24 hours of dietary change

By Egleze Editorial Desk · Published September 9, 2026 · Feel Better, Live More with Dr Rangan Chatterjee · Your Gut Needs More Than Probiotics! | Dr Will Bulsiewicz
Dr Will Bulsiewicz says measurable microbiome changes can begin within 24 hours of dietary change
Feel Better, Live More with Dr Rangan Chatterjee
Feel Better, Live More with Dr Rangan Chatterjee
Your Gut Needs More Than Probiotics! | Dr Will Bulsiewicz

What was said

"Literally by tomorrow, literally by tomorrow, there's already changes that are underway. Now, are we installing a brand new gut microbiome? Are we completely transforming it in 24 hours? Absolutely not."

Gastroenterologist Dr Will Bulsiewicz says the gut microbiome can show detectable changes as soon as the next day after changing what you eat, while stressing this does not mean a complete transformation in 24 hours. He points to a 2014 Nature study (lead author Lawrence David, Duke University) that tracked daily microbiome measurements during five-day animal-only and plant-only dietary patterns.

Verification status

Attributed speaker claim

Egleze verified who said this and where. The underlying claim has not been independently established by Egleze.

Source and context

Egleze verified who said this and where. The underlying claim has not been independently established by Egleze.

Speaker
Dr Will Bulsiewicz · guest
Programme
Feel Better, Live More with Dr Rangan Chatterjee
Episode
Your Gut Needs More Than Probiotics! | Dr Will Bulsiewicz
Clip time
11:56
Original source
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Feel Better, Live More with Dr Rangan Chatterjee
Feel Better, Live More with Dr Rangan Chatterjee

Your Gut Needs More Than Probiotics! | Dr Will Bulsiewicz

September 9, 2026 · 1h 55m · 3 Egleze moments
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