This article explains the difference between a nutritionist, dietician, and nutritional therapist. It discusses their roles and qualifications in providing advice on healthy eating and food. It also explores the concept of essential nutrients and their sources, the role of proteins in plant sources, and the effects of inadequate energy consumption on protein synthesis. Additionally, it covers the terms 'mutual supplementation' and 'complementary proteins' in relation to proteins, as well as the functions of linoleic acid and linolenic acid. The article also provides information on eicosanoids, prostacyclins, leukotrienes, thromboxanes, and prostaglandins. It concludes with a discussion on different types of carbohydrates and their sources, the impact of CHO in the diet on fat intake, and the concepts of organic and inorganic compounds.