Here are three things to know:
1. Scientific American reported that the runners’ “guts got leaky — due to a lack of blood flow to the intestines.” This was an immune response in the athletes’ bodies.
2. Blood samples were analyzed for gram-negative bacterial endotoxin, C-reactive protein, cytokine profile and plasma osmolality.
3. Gastrointestinal symptoms were reported by 75 percent of ultra-endurance runners, with no symptoms reported by the control group.
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