A qualified Nutritional Therapist is someone who holds a 3 year diploma in Nutritional Therapy and is trained in basic biochemistry, physiology and pathology as well as supervised clinical practice.As such, a Nutritional Therapist is qualified to work in private practice and see clients on a one to one or group basis.A Nutritional Therapist offers personalised diet & lifestyle advice which is tailored to your individual health needs and goals.This includes carefully chosen dietary recommendations, practical meal suggestions and recipes as well as tips on how to incorporate the changes into your lifestyle. qualified Nutritional Therapist is someone who holds a 3 year diploma in Nutritional Therapy and is trained in basic biochemistry, physiology and pathology as well as supervised clinical practice.