Psychology is the scientific study of the mind and behavior. It involves exploring and understanding various aspects of our cognition, emotion, perception, personality, and social interaction.

Psychoneuroimmunology (PNI) is a field of study that investigates the interactions and communication between the nervous, endocrine, and immune systems. It explores how psychological factors, such as stress, emotions, and cognitive processes, can influence immune function and how immune responses, in turn, can impact neurological and psychological processes.

Psychonutrition studies how nutrition impacts psychological well-being and cognitive function, aiming to use dietary interventions to improve mental health.

Psychosis is defined as a severe disruption in reality perception characterized by delusions and/or hallucinations (West, 2013). It is a common shared symptom of various disorders, including psychotic and non-psychotic disorders and neurologic and medical conditions (Arciniegas, 2015).

Psychotic disorders are severe mental illnesses that affect a person’s thinking, feelings, and behavior, such as hallucinations, delusions, disorganized thinking, and motor behavior (Tampi et al., 2019).

Purging behaviors are compensatory behaviors used by eating disorder patients, in which they forcibly eject food from their bodies in an effort to regulate their weight and/or physical appearance (Wade, 2017). Self-induced vomiting is the most common purging behavior (Neale & Hudson, 2020).