There are nearly 100 million cases of intestinal infectious diseases annually in the United States, according to Garthright, Archer and Kvenberg, three researchers with
Food and Drug Administration's Center for Food Safety and Applied Nutrition, Washington, DC.

Is about a third of total population.

A third of the people I know who rode bicycles last year had intestinal infections during this period.

Therefore: bicycle-riding causes intestinal infections. I know this with utter certainty, because I've ridden a bicycle for many years!


p.s. I've never ridden a bicycle in Antarctica, nor, unlike my terribly obese aunt, paid for penguin cruise nor guides there etc. Perhaps gastro-intestinal complaints on these trips are also common due to high number of people riding bicycles.