A nutritionist provides guides on the matters of nutrition and food and their impacts on the health of human. There are different professional terms used for a nutritionist in different countries some of them are nutrition scientist, dietitian-nutritionist, public health nutritionist, clinical nutritionist, and sports nutritionist. Nutritionists focus on planning healthy diets. Some nutritionists also give the educational services or programs to aware the public on the strategies for healthy eating.
A psychologist is a medical doctor who trained in diagnosis, and treatment of a mental illness including schizophrenia, behavioral problems, learning difficulties, depression, and anxiety. Psychologists provide a wide range of treatments including psychological treatment also called psychotherapy or talking therapy, medication, behavioral, cognitive, cognitive-behavioral, interpersonal, humanistic, and psychodynamic therapy. A psychologist may also use the Diagnostic and Statistical Manual (DSM) criteria to diagnose the mental disease.
Sexologists are doctors who study human sexuality, including sexual behaviors, interests, and functions. They deal with problems regarding intimacy and relationships and also guide to achieve the best relationship. They mainly resolve sexual issues between the relationships. They conduct one to one sessions for sexual problems.