Nutritional and dietary needs of different groups of people

Welcome to Your Nutrition Journey!

In this chapter, we are going to explore how our bodies' needs change as we grow and go through life. Think of your body like a car: a tiny remote-controlled car needs much less fuel than a giant monster truck! Humans are the same. A tiny baby needs different "fuel" than a busy teenager or a grandparent. We will also look at why some people have to be careful about specific foods because of allergies, intolerances, or autoimmune conditions.

Don't worry if this seems like a lot to remember! We’ll break it down into bite-sized chunks, and by the end, you’ll be an expert at planning the perfect plate for anyone.

1. Life Stages: The Growing Body

Our nutritional needs change depending on our life stage. This is because our bodies do different things at different ages, like growing rapidly, staying active, or slowing down.

Babies and Toddlers (0-3 years)

This is a time of incredibly fast growth!

• Key Needs: High energy and fat for brain development and growth.
• Important Nutrients: Calcium and Vitamin D for strong bones and teeth. Iron is vital as their stores run low after 6 months.
• Portion Sizes: Very small! Their stomachs are only about the size of their fist.

Pre-school and School-aged Children (4-11 years)

Children are usually very active and still growing.

• Key Needs: A balanced diet following the Eatwell Guide.
• Important Nutrients: Calcium and Vitamin D are still "must-haves" for growing skeletons.
• Healthy Tip: Avoid too many sugary snacks to prevent dental health issues (tooth decay).

Adolescents (12-18 years)

Teenagers go through "growth spurts" and huge hormonal changes.

• Key Needs: High energy because they are often very active and growing fast.
• Important Nutrients:
  - Iron: Especially important for girls due to blood loss during menstruation (to prevent anaemia).
  - Calcium: To reach "peak bone mass" – this is the time to build the strongest bones possible!

Adults (19-64 years)

Adults have stopped growing, so their focus is on maintenance and health.

• Key Needs: Energy intake must match Physical Activity Level (PAL) to avoid obesity.
• Healthy Tip: Follow the "Eight tips for healthy eating," such as eating more fibre and less salt to prevent high blood pressure.

Older People (65+ years)

As we get older, our bodies become less efficient at absorbing nutrients.

• Key Needs: They often need less energy (because they move less), but they still need plenty of vitamins and minerals.
• Important Nutrients: Vitamin B12 for brain health and Dietary Fibre to help with digestion (to prevent diverticulitis).

Pregnancy and Lactation (Breastfeeding)

Common Mistake: You do not need to "eat for two" in terms of calories! You only need a small amount of extra energy in the final three months of pregnancy.

• Key Nutrients: Folic Acid (Vitamin B9) is crucial before and during early pregnancy to prevent birth defects like Spina Bifida. Iron is needed to supply blood to the baby.
• Lactation: Breastfeeding mothers need extra Calcium and plenty of Water.

Quick Review: - Babies: Fast growth, high fat/energy. - Teens: Growth spurts, Iron and Calcium. - Older People: Fibre and nutrient-dense foods.

2. Understanding Energy Balance

Energy is the fuel our body uses to work. We measure this energy in kilocalories (kcal) or kilojoules (kJ).

The Energy Equation

To keep a healthy weight, we need to balance the energy we take in (food) with the energy we use (movement).
\( \text{Energy Balance} = \text{Energy Intake} - \text{Energy Expenditure} \)

BMR vs. PAL:

• BMR (Basal Metabolic Rate): This is the energy your body needs just to stay alive while resting (keeping your heart beating and lungs breathing). Analogy: A car engine idling while parked.
• PAL (Physical Activity Level): This is the extra energy you use for movement, like walking to school or playing football.

Did you know? Men generally have a higher BMR than women because they often have more muscle mass, which burns more energy even at rest!

3. Special Dietary Needs: Allergies, Intolerances, and Coeliac Disease

Sometimes, certain foods can make people very ill. It is important to know the differences between an allergy, an intolerance, and coeliac disease.

Food Allergy

This is an immune system reaction. The body mistakenly treats proteins in food as harmful invaders and produces antibodies, triggering symptoms rapidly. This can be severe and life-threatening (anaphylaxis).
Common triggers: Peanuts, tree nuts, eggs, shellfish, and cow's milk.

Food Intolerance

This is usually a digestive system issue where the body struggles to digest or process a specific substance. It does not involve the immune system and is not life-threatening, but causes discomfort.

• Lactose Intolerance: The body cannot digest lactose (milk sugar) because it lacks the enzyme lactase. People often choose dairy-free alternatives such as soya or oat milk.

Coeliac Disease

Coeliac disease is listed in the specification under food intolerance (gluten), but medically it is an autoimmune condition, not a simple digestive intolerance. When a person with coeliac disease eats gluten (a protein found in wheat, barley, and rye), their immune system attacks the lining of the small intestine, preventing proper nutrient absorption. People with coeliac disease must follow a strict, lifelong gluten-free diet.

4. Dietary Reference Values (DRVs)

DRVs are estimates of the amounts of nutrients and energy people need. They are not strict rules but benchmarks to help us assess diets and plan healthy meals.

• Recommended Daily Amounts: These help us plan meals to ensure we get enough macronutrients (protein, fat, carbohydrates) and micronutrients (vitamins, minerals).
• Calculation & Recipe Adaptation: Nutritional information tables are used to calculate the energy and nutrient values of meals, allowing recipes to be modified to suit individual needs.

Key Takeaway: When planning a meal, you must look at who you are cooking for. A person with Coeliac disease will need gluten-free pasta, while a pregnant woman will benefit from foods rich in folic acid and iron.

Quick Check: Common Mistakes to Avoid

1. Don't assume everyone needs the same portion size. A toddler's portion is much smaller than an adult's.
2. Don't confuse "Lactose Intolerance" (digestive issue with milk sugar) with "Cow's Milk Allergy" (immune response to milk protein).
3. Don't forget coeliac disease when asked about food intolerances: the specification lists gluten (coeliacs) under food intolerance, but medically coeliac disease is an autoimmune condition triggered by gluten.
4. Don't forget that Water is a vital nutrient for every single group of people to prevent dehydration.

You're doing great! Nutrition is simply about matching the right food to the right person at the right time. Keep practicing these categories, and you'll be ready for your exam!