Training harder could be rewiring your gut bacteria
Science Daily
February 24, 2026
AI-Generated Deep Dive Summary
Intense training has been found to significantly alter the gut microbiome in athletes, potentially impacting both health and athletic performance. A study conducted by Edith Cowan University (ECU) revealed that varying levels of training intensity lead to noticeable changes in gut bacteria composition, particularly in short-chain fatty acid levels and specific bacterial species. These findings suggest a deeper connection between exercise, diet, and gut health than previously understood.
During periods of high-intensity training, athletes experienced shifts in their gut microbiome, which could be linked to the production of lactate during intense workouts. Lactate, produced by muscles during exertion, may influence the growth of certain bacteria in the gut, potentially altering the microbial balance. This interaction between exercise and gut bacteria could have implications for physical performance and recovery.
However, the study also highlighted that reduced training loads correlated with a decline in diet quality and slower gut transit times. Athletes tended to consume more processed foods, fewer fresh fruits and vegetables, and increased alcohol intake during rest periods, which negatively impacted their gut microbiome. Slower digestion during these low-training phases further contributed to changes in gut bacteria composition.
The study underscores the importance of understanding how training intensity, diet quality, and gut health interplay. While the exact mechanisms linking the gut microbiome to athletic performance remain unclear, early insights suggest that the gut may play a role in processing lactate and regulating pH levels, both of which are critical for physical output and recovery.
This research not only advances our understanding of gut microbiology but also offers practical implications for athletes aiming to optimize their performance. By fine-tuning training intensity
Verticals
scienceresearch
Originally published on Science Daily on 2/24/2026