A distance runner states that she is taking glutamine supplements because she is constantly plagued by upper respiratory tract infections. Is there a biologically plausible link?

Question

Quizplus · Accepted Answer

Glutamine is important for immune system function, and its levels can decline during prolonged exercise. Glutamine can be used as fuel by immune system cells, which may be beneficial in preventing upper respiratory tract infections that are common in endurance athletes. Therefore, there is a biologically plausible link between taking glutamine supplements and reducing the frequency of upper respiratory tract infections in a distance runner.

A Distance Runner States That She Is Taking Glutamine Supplements