Welcome to Priority Health Issues
Welcome! In this chapter for Component 1: Food and Nutrition, we will explore the six major priority health issues in Northern Ireland and the wider UK. These are health conditions directly influenced by what we eat and the lifestyle choices we make.
Don't worry if nutrition science feels overwhelming at first. We will break each condition down step by step: what it is, what increases your risk, and what protects your body. By the end of these notes, you will know exactly how to link specific nutrients to health outcomes like a pro!
Core Dietary Standards & Recommendations
Before looking at each health issue, let's look at three vital dietary benchmarks used throughout our course:
1. The Eatwell Guide: The primary visual guide showing the proportions of food groups needed for a healthy, balanced diet.
2. Dietary Fibre Target: Adults should aim for at least 30g of dietary fibre per day.
3. Salt Limit: Adults should consume no more than 6g of salt per day (which contains approximately \(2.4\text{g}\) of sodium).
1. Overweight and Obesity
What is it?
Overweight and obesity refer to abnormal or excessive accumulation of body fat that presents a risk to overall health. It occurs when a person consistently consumes more energy from food than their body burns through daily activity and exercise (positive energy balance).
Dietary Risk Factors
• High intake of free sugars: Frequently drinking sugar-sweetened beverages (SSBs) and eating sugary treats provides lots of energy without making you feel full.
• Energy-dense foods: Foods that are high in fat and sugar pack a large number of calories into small portions.
• Poor portion control: Eating larger portions than the body requires.
Protective Dietary Factors
• High-fibre foods: Eating plenty of whole grains, vegetables, and pulses increases satiety (the feeling of fullness), which helps prevent overeating.
• Following the Eatwell Guide: Basing meals on balanced proportions of starchy carbohydrates, fruits, and vegetables helps maintain a healthy energy balance.
Key Takeaway: Obesity develops from excess energy intake. Choosing high-fibre foods improves satiety and helps keep energy intake balanced.
---2. Cardiovascular Disease (CVD)
What is it?
Cardiovascular Disease (CVD) is an umbrella term for conditions affecting the heart or blood vessels. It includes coronary heart disease (CHD) and stroke.
Dietary Risk Factors
• High saturated fat and trans fats: These raise the levels of harmful cholesterol in the blood, leading to fatty deposits building up in the arteries (atherosclerosis).
• High salt intake: Consuming more than 6g of salt per day increases blood pressure (hypertension), putting extra strain on the heart and blood vessels.
Protective Dietary Factors
• Unsaturated fats: Replacing saturated fats with unsaturated fats, especially Omega-3 fatty acids (found in oily fish), helps protect heart health.
• High dietary fibre: Soluble fibre helps lower blood cholesterol levels.
• Reducing salt: Keeping daily salt intake at or below 6g per day helps maintain normal blood pressure.
Key Takeaway: Protect your heart by swapping saturated fats for unsaturated fats and keeping daily salt intake under \(6\text{g}\).
---3. Type 2 Diabetes
What is it?
Type 2 diabetes occurs when the pancreas cannot produce enough insulin, or the body's cells become resistant to the insulin produced. Insulin is the hormone needed to move glucose from the blood into cells for energy.
Dietary & Lifestyle Risk Factors
• Obesity and high waist circumference: Carrying excess fat around the abdomen is the single largest risk factor for developing insulin resistance.
• High intake of refined carbohydrates and free sugars: Causes rapid spikes in blood glucose levels.
Dietary Management & Protective Factors
• Low-Glycaemic Index (Low-GI) foods: Choosing low-GI carbohydrates (such as oats, lentils, and whole grains) releases glucose slowly into the bloodstream, helping to stabilise blood sugar levels.
• Weight management: Eating a balanced diet aligned with the Eatwell Guide to maintain a healthy body weight.
Key Takeaway: Type 2 diabetes is strongly linked to weight. Low-GI carbohydrates help manage blood sugar by releasing glucose slowly.
---4. Osteoporosis
What is it?
Osteoporosis is a condition where bones lose density, become weak and porous, and break easily. Achieving high peak bone mass during childhood and young adulthood helps reduce the risk of fractures in later life.
Key Nutrients & Protective Factors
• Calcium: The main mineral required to build and maintain strong bones (found in milk, cheese, yoghurt, and fortified plant milks).
• Phosphorus: Works together directly with calcium to build strong bone structure.
• Vitamin D: Essential because the body cannot absorb calcium efficiently without it. Vitamin D is made via sunlight on the skin and found in oily fish and fortified spreads.
• Weight-bearing exercise: Activities like walking, running, and dancing stimulate bone strengthening alongside good nutrition.
Key Takeaway: Think of Calcium and Vitamin D as a team: Calcium builds the bone structure, but Vitamin D is required to unlock calcium absorption.
---5. Dental Caries (Tooth Decay)
What is it?
Dental caries is the destruction of tooth enamel and the underlying tooth structure, leading to cavities and pain.
How Does it Happen?
1. Bacteria: Bacteria naturally present in dental plaque feed on sugars in the mouth.
2. Acid Production: These bacteria produce acids as a byproduct.
3. Enamel Attack: The acid dissolves minerals in the tooth enamel (de-mineralisation), creating decay.
Risk Factors vs. Protective Factors
• Risk: Frequency and amount of free sugars: Consuming free sugars (also known as Non-Milk Extrinsic Sugars / NMES) frequently exposes teeth to continuous acid attacks.
• Protection: Limiting sugary snacks to mealtimes: Eating sweet foods only at mealtimes reduces the number of separate acid attacks per day.
• Protection: Fluoride: Brushing regularly with fluoride toothpaste strengthens tooth enamel against acid attacks.
Key Takeaway: It is not just how much sugar you eat, but how often you eat it. Keep sugary foods to mealtimes to minimise acid attacks.
---6. Iron-Deficiency Anaemia
What is it?
Iron-deficiency anaemia occurs when there is a lack of iron in the body, leading to a reduced number of red blood cells or a lower level of haemoglobin. Symptoms include extreme tiredness, lack of energy, and pale skin.
Target Groups at Risk
Particularly prevalent in adolescent girls and women of childbearing age due to monthly blood loss during menstruation, combined with increased growth demands.
Understanding Iron in the Diet
• Haem Iron: Found in animal foods (red meat, liver). It is easily and efficiently absorbed by the body on its own.
• Non-Haem Iron: Found in plant sources (spinach, beans, lentils, fortified breakfast cereals). It is harder for the body to absorb.
• The Vitamin C Booster: Vitamin C must be consumed at the same time as non-haem iron to convert it into an easily absorbable form (e.g., drinking orange juice with a fortified breakfast cereal).
Key Takeaway: Plant-based (non-haem) iron needs a Vitamin C partner at the same meal to help the body absorb it properly.
---Common Exam Pitfalls to Avoid
• Don't say "unhealthy food": Examiners do not award marks for vague words. Always use precise terms like "energy-dense", "high in saturated fat", or "high in free sugars".
• Don't mix up Diabetes types: Type 1 is an autoimmune condition. Type 2 is the lifestyle-related priority health issue covered in our specification.
• Remember the Vitamin C rule: Vitamin C specifically boosts the absorption of non-haem iron (plant sources), not haem iron.
• Know your Salt target: Remember the limit is 6g of salt per day for adults (not \(6\text{g}\) of sodium).
Quick Revision Checklist
Overweight/Obesity: Linked to high free sugars, energy-dense foods; protected by high fibre (satiety) and the Eatwell Guide.
Cardiovascular Disease: Risk increased by saturated/trans fats and salt (\(>6\text{g}\)); protected by unsaturated fats and fibre.
Type 2 Diabetes: Linked to waist circumference and refined carbohydrates; managed with Low-GI foods.
Osteoporosis: Prevented by building peak bone mass using Calcium, Phosphorus, Vitamin D, and weight-bearing exercise.
Dental Caries: Caused by plaque bacteria turning free sugars into acid; protected by fluoride and limiting sugary items to mealtimes.
Iron-Deficiency Anaemia: Affects adolescent girls/women; non-haem iron requires Vitamin C for absorption.