Vitamins (Micronutrients) — OCR GCSE Food Preparation and Nutrition

Vitamins are essential micronutrients that the body requires in small amounts to function properly. Unlike macronutrients (carbohydrates, proteins, and fats), vitamins do not provide energy but are vital for processes such as immune function, vision, blood clotting, and bone health. They are classified into two groups: fat-soluble vitamins (A, D, E, K) which are stored in the body's fatty tissues, and water-soluble vitamins (B group and C) which are not stored and need to be consumed regularly. A deficiency in any vitamin can lead to specific health problems, making it crucial to understand their sources and functions.

In the OCR GCSE Food Preparation and Nutrition course, you need to know the main vitamins, their food sources, functions in the body, and the effects of deficiency. This topic links to broader concepts like balanced diets, meal planning, and the impact of cooking methods on nutrient retention. For example, vitamin C is destroyed by heat and light, so steaming vegetables helps preserve it. Understanding vitamins helps you make informed choices about food preparation and diet, which is a key skill for both exams and real-life nutrition.

Vitamins also connect to other topics such as digestion, absorption, and the role of antioxidants. For instance, vitamin C aids iron absorption, and vitamin D works with calcium for bone health. By mastering this topic, you'll be able to analyse recipes, evaluate dietary choices, and explain how cooking affects nutrient content—skills that are tested in both written exams and the non-exam assessment (NEA).

• →Fat-soluble vitamins (A, D, E, K) are stored in the body, so excess can be toxic; water-soluble vitamins (B group, C) are excreted in urine and need regular intake.
• →Vitamin A (retinol) is needed for vision, immune function, and skin health; sources include liver, carrots, and dark leafy greens. Deficiency can cause night blindness.
• →Vitamin D (calciferol) is made by the skin when exposed to sunlight and is also found in oily fish, eggs, and fortified foods; it helps absorb calcium for strong bones. Deficiency leads to rickets in children and osteomalacia in adults.
• →Vitamin C (ascorbic acid) is an antioxidant that helps wound healing, iron absorption, and immune function; sources include citrus fruits, peppers, and broccoli. Deficiency causes scurvy (bleeding gums, fatigue).
• →B vitamins (e.g., B1 thiamin, B2 riboflavin, B3 niacin, B9 folate, B12 cobalamin) help release energy from food and form red blood cells; sources include whole grains, meat, dairy, and leafy greens. Deficiency in B12 can cause anaemia and nerve damage.

• Identification of fat-soluble vitamins: A (retinol and carotene), D, E, K
• Identification of water-soluble vitamins: B1 (thiamine), B2 (riboflavin), B3 (niacin), B9 (Folate/Folic acid), B12 (cobalamin), C (ascorbic acid)
• Explanation of functions for specific vitamins
• Identification of deficiency symptoms for specific vitamins
• Knowledge of food sources for specific vitamins

• 💡Ensure you can distinguish between fat-soluble and water-soluble vitamins as this affects how they are stored and lost during cooking
• 💡Be prepared to link vitamin content to specific food commodities studied in the specification
• 💡Use specific examples: When describing a vitamin's function, always link it to a food source and a deficiency disease. For instance, 'Vitamin C, found in oranges and broccoli, is needed for collagen production; deficiency causes scurvy.' This shows depth of knowledge.
• 💡Explain the effect of cooking: In exam questions about nutrient retention, mention that boiling vegetables can leach water-soluble vitamins into the water, while steaming or microwaving preserves them. For fat-soluble vitamins, cooking with oil can aid absorption.
• 💡Connect to the diet: When discussing a balanced diet, explain how different food groups provide different vitamins. For example, dairy provides vitamin D and B2, while fruits and vegetables provide vitamin C and folate. This demonstrates application.

• Misconception: All vitamins are destroyed by cooking. Correction: While water-soluble vitamins (especially C and B) are sensitive to heat and water, fat-soluble vitamins (A, D, E, K) are more stable. For example, vitamin A in carrots is better absorbed after cooking because heat breaks down cell walls.
• Misconception: Taking vitamin supplements is always better than getting them from food. Correction: Whole foods provide fibre, minerals, and other beneficial compounds that supplements lack. Also, fat-soluble vitamins can build up to toxic levels if over-supplemented.
• Misconception: Vitamin D deficiency is only a problem in winter. Correction: In the UK, sunlight is insufficient for vitamin D synthesis from October to March, so deficiency can occur year-round if diet is poor. Public Health England recommends supplements for everyone during autumn and winter.