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

A growing trend in the world is the market for vegan and vegetarian products, products that aim at sustainable and healthy diets with an increase in the consumption of vegetables, with a predominance of red meat and its derivatives, since it is based on plants, which are the main source of beneficial antioxidants.

It is known that mental disorders such as anxiety and depression are extremely present in several clinical profiles.

Anxiety disorders are the most common group of mental illnesses. Brazil leads the world in the prevalence of anxiety (WHO, 2017). There are several factors that contribute to anxiety, including hormonal changes, genetics, and stress.

Over the past few years, much of the research on creatine (Cr) has been directed to its role as an important source of energy for muscle contraction during high-intensity physical or sports activities, and it is known that the increase in its plasma concentration promotes greater formation of the phosphocreatine complex (CrP) in muscle tissue and thus increases the energy available during exercise, prolonging the intensive work capacity of skeletal muscle, delaying muscle fatigue and promoting improved performance.

It is known that cerebrovascular health, during senescence, undergoes significant changes in its functionality. And among the observed implications, cognitive aging stands out.

Currently, aspects related to mental health, such as sleep disorders, anxiety, depression, and cognitive impairment significantly affect the quality of life of an increasing number of people.

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.