Study Finds Juice Cleanses Disrupt Gut and Oral Microbiomes

New research reveals that three-day juice cleanses can increase harmful bacteria linked to inflammation and other health risks.

A study by Northwestern and San Raffaele universities found that juice-only diets can disrupt gut and oral microbiomes, increasing bacteria tied to inflammation and disease.
Participants on a juice-only cleanse showed the most significant microbial shifts, while those combining juice with whole foods or eating plant-based diets had fewer negative effects.
Juicing removes fiber, which is crucial for supporting beneficial gut bacteria and regulating blood sugar, potentially allowing harmful bacteria to thrive.
The oral microbiome was particularly affected, with a decline in beneficial bacteria and an increase in inflammation-linked species after just three days of juicing.
Researchers recommend blending fruits and vegetables to retain fiber or pairing juices with whole foods to mitigate microbiome imbalances.