Skip to main content
Northern IrelandNutrition & Food ScienceSyllabus dot point

How does diet affect bones, teeth and blood, and which conditions arise when key nutrients are short?

Diet-related conditions of bone, teeth and blood: osteoporosis and the role of calcium and vitamin D, dental caries and the role of free sugars and fluoride, and iron-deficiency anaemia and the role of iron and vitamin C, with the dietary advice for each.

A CCEA A-Level Nutrition and Food Science answer on diet-related conditions of bone, teeth and blood: osteoporosis and calcium and vitamin D, dental caries and free sugars and fluoride, and iron-deficiency anaemia and iron and vitamin C, with the dietary advice for each.

Generated by Claude Opus 4.812 min answer

Reviewed by: AI editorial process; not yet individually human-reviewed

Have a quick question? Jump to the Q&A page

Jump to a section
  1. What this dot point is asking
  2. Osteoporosis: calcium and vitamin D
  3. Dental caries and anaemia
  4. Examples in context
  5. Try this

What this dot point is asking

CCEA wants you to explain the diet-related conditions affecting bone, teeth and blood: osteoporosis (calcium and vitamin D), dental caries (free sugars and fluoride), and iron-deficiency anaemia (iron and vitamin C), with the causes, consequences and dietary advice for each.

Osteoporosis: calcium and vitamin D

A diet low in calcium reduces the mineral available for bone, and a lack of vitamin D reduces calcium absorption, so both raise the risk. It is more common in older people and in women after the menopause, when falling oestrogen speeds bone loss. Prevention is to build a high peak bone mass when young and protect bone later: eat enough calcium (dairy, fortified alternatives, tinned fish with bones) with adequate vitamin D (oily fish, fortified foods, sunlight or a supplement), do regular weight-bearing exercise, and avoid smoking and excessive alcohol.

Dental caries and anaemia

Examples in context

Example 1. Sugary-drink habit and tooth decay. A child who sips sugary squash throughout the day exposes the teeth to repeated acid attacks, far worse than the same sugar taken once at a meal. Switching to water between meals, keeping sugar to mealtimes and using fluoride toothpaste sharply reduces caries risk, demonstrating the frequency principle that CCEA emphasises.

Example 2. Building peak bone mass. A teenager who eats plenty of dairy or fortified alternatives, gets enough vitamin D and does weight-bearing exercise builds a high peak bone mass. This provides a reserve that lowers the lifetime risk of osteoporosis, showing how an action in adolescence protects health decades later and linking bone health to the life-stage content.

Try this

Q1. Name the two nutrients most important for preventing osteoporosis and state the role of each. [2 marks]

  • Cue. Calcium (forms bone mineral) and vitamin D (needed to absorb calcium).

Q2. Explain why the frequency of eating free sugars matters for dental caries. [2 marks]

  • Cue. Each time free sugars are eaten, bacteria produce acid that attacks enamel, so frequent intake means more frequent acid attacks.

Q3. State one food source of iron and one way to improve its absorption. [2 marks]

  • Cue. Source: red meat, pulses, dark green vegetables or fortified cereal. Improve absorption: take vitamin C with the meal.

Exam-style practice questions

Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.

CCEA AS 20186 marksExplain the causes of osteoporosis and describe the dietary and lifestyle advice that can help prevent it.
Show worked answer →

A 6-mark answer needs the cause of osteoporosis and the dietary and lifestyle prevention.

Osteoporosis is a condition in which the bones lose density and become weak and brittle, so they fracture easily. Bone is laid down during growth, reaching a peak bone mass in early adulthood, and is then gradually lost with age. The condition arises when too little bone is built or too much is lost, and it is more common in older people and in women after the menopause, when falling oestrogen speeds bone loss.

A diet low in calcium reduces the mineral available for bone, and a lack of vitamin D reduces calcium absorption, so both raise the risk. Prevention advice is to build a high peak bone mass when young and protect bone later by eating enough calcium (dairy, fortified alternatives, tinned fish with bones) with adequate vitamin D (oily fish, fortified foods, sunlight or a supplement), doing regular weight-bearing exercise, and avoiding smoking and excessive alcohol.

Markers reward the loss of bone density definition, the role of low calcium and vitamin D, the post-menopausal and age factors, and prevention through calcium, vitamin D and weight-bearing exercise.

CCEA AS 20204 marksExplain how free sugars contribute to dental caries and state how the diet can help prevent tooth decay.
Show worked answer →

A 4-mark answer needs the mechanism of dental caries and the dietary prevention.

Dental caries (tooth decay) occurs when bacteria in plaque on the teeth ferment free sugars from food and drink, producing acid. The acid attacks and dissolves the enamel of the tooth, and repeated acid attacks lead to cavities. The more often free sugars are eaten, especially sticky or sugary snacks and drinks between meals, the more frequent the acid attacks.

Prevention through diet is to reduce the amount and especially the frequency of free sugars, keep sugary foods to mealtimes rather than snacking, choose water or milk between meals, and eat foods that need chewing. Fluoride (in toothpaste and some water) strengthens enamel against the acid.

Markers reward bacteria fermenting sugars to acid that dissolves enamel, the importance of frequency, and prevention by reducing sugar frequency with fluoride strengthening enamel.

Related dot points

Sources & how we know this