The intestine is responsible for regulating various systems in the human body.

The effects of critical/acute illness on the human microbiota are already well known, given the need - in many cases - for the use of broad-spectrum antibiotics.

In recent years, there has been increasing awareness of the prognostic value of skeletal muscle changes in chronic diseases, and a multimodal approach is considered the best option for treating muscle loss.

Intense exercise involves an adaptive process involving affective, physiological, biochemical, and cognitive behavioral responses to meet the control of homeostasis.