Introduction to Nutrition and Dietetics: Concepts, Scope and Careers
What this domain asks
Nutrition is the science of food, nutrients and their action and balance in relation to health and disease. Dietetics is the applied, person-facing use of that science to plan normal, therapeutic and institutional diets. The exam tests definitions, nutrient classification and the scope of the profession.
Core rules
- Nutrients are chemical components of food used by the body: macronutrients (carbohydrate, protein, fat, water) in gram quantities and micronutrients (vitamins, minerals) in milligram or microgram quantities.
- Food is the carrier; a nutrient is the component. A diet is what a person actually eats; a balanced diet supplies all nutrients in required amounts.
- Career branches: clinical (wards, OPD, ICU, therapeutic diets), community/public health, food service systems, sports nutrition, food industry and regulatory affairs, research and teaching.
- Malnutrition includes undernutrition (stunting, wasting, deficiency disease) and overnutrition (obesity, diet-related chronic disease). Optimum nutrition is the zone between them.
Worked example
A 45-year-old man newly diagnosed with type 2 diabetes is referred after his physician visit. Which branch of the profession is involved and what comes first? Reasoning: his need is individual, disease-specific modification of an existing diet, so this is clinical dietetics, not community nutrition. The first step is nutritional assessment - diet history, anthropometry (weight, BMI, waist circumference), biochemical values and clinical signs - because no prescription can be written before the baseline is established.
Traps that cost marks
Do not treat 'nutritionist' and 'dietitian' as identical in a definition answer; dietetics is the applied discipline. Do not write that malnutrition means only undernutrition. Do not confuse nutrient deficiency with food insecurity - one can occur without the other.