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How do a person's dietary needs change at different stages of life, and why?

How dietary needs change at different stages of life, including babies and children, teenagers, adults, pregnant women and older adults, and how to adapt meals to meet them.

An SQA National 5 Health and Food Technology answer on how dietary needs change across life stages, covering babies and children, teenagers, adults, pregnancy and older adults, and how meals can be adapted to meet them.

Generated by Claude Opus 4.810 min answer

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

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  1. What this dot point is asking
  2. Why needs change
  3. Babies and young children
  4. Teenagers
  5. Adults
  6. Pregnant women
  7. Older adults
  8. Examples in context
  9. Try this

What this dot point is asking

The SQA wants you to explain how the food a person needs changes at different stages of life, give reasons linked to growth, activity and health, and suggest how meals can be adapted to suit a particular group.

Why needs change

The amount and balance of nutrients a person needs depend on how fast they are growing, how active they are, and the demands of their stage of life such as pregnancy. The same person needs different things at five, fifteen, thirty-five and seventy-five.

Babies and young children

Teenagers

This is also a stage when skipping meals and snacking on high-sugar, high-fat foods is common, so encouraging regular balanced meals matters.

Adults

Adults have stopped growing, so they need a balanced diet to maintain health rather than to grow. The key is to match energy intake to activity: someone with a desk job needs less energy than a manual worker, and eating more energy than is used leads to weight gain. Adults should follow current dietary advice, cutting saturated fat, sugar and salt and eating plenty of fibre, fruit and vegetables.

Pregnant women

Older adults

Examples in context

Example 1. A teenage girl's packed lunch. Including a wholemeal wrap with chicken (protein and iron), a yoghurt (calcium), and fruit with vitamin C helps the body absorb the iron, meeting the higher iron and growth needs of a teenage girl.

Example 2. Early pregnancy. A woman in early pregnancy chooses a breakfast of fortified cereal (folic acid and iron) with milk (calcium) and a glass of orange juice (vitamin C to absorb iron), supporting the baby's development and her own extra blood needs.

Try this

Q1. State one nutrient a teenager needs in larger amounts, and the reason. [1 mark]

  • Cue. Protein (for the growth spurt), or calcium (to build strong bones), or iron for girls (to avoid anaemia).

Q2. Name the nutrient a woman is advised to eat more of in early pregnancy to protect the baby's nervous system. [1 mark]

  • Cue. Folic acid (folate).

Exam-style practice questions

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

SQA N5 style4 marksDescribe two dietary needs of a teenager and explain why each is important at this stage of life.
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A 4-mark answer needs two needs, each with a reason, so plan two need marks and two reason marks.

Need 1. A teenager needs plenty of protein. This is important because teenagers go through a rapid growth spurt and protein is needed for the growth of new body cells and tissues.

Need 2. A teenager needs plenty of calcium (with vitamin D to absorb it). This is important because bones are still growing and reach most of their adult strength in the teenage years, so calcium helps build strong bones and reduce the later risk of osteoporosis.

A further point that scores is iron, especially for teenage girls who lose iron through menstruation and need it to make haemoglobin and avoid anaemia. Energy needs are also high because teenagers are growing and often active.

Markers reward each need with a correct reason linked to this life stage. A need with no reason scores only one mark.

SQA N5 style3 marksExplain three ways a pregnant woman should adapt her diet, and give a reason for each.
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This question rewards advice specific to pregnancy, each with a reason.

Way 1. Eat plenty of foods rich in folic acid (folate), such as green leafy vegetables and fortified cereal, especially in early pregnancy, because folic acid helps the baby's spine and nervous system develop properly and reduces the risk of neural tube defects.

Way 2. Eat plenty of iron-rich foods, because the mother is making extra blood for herself and the baby and needs iron to make haemoglobin and avoid anaemia.

Way 3. Include calcium and vitamin D, because the baby needs calcium to build its bones and teeth, and vitamin D helps the body absorb it.

A further valid point is to avoid certain foods such as soft unpasteurised cheeses, raw eggs and too much liver, because of the risk to the baby. Markers reward three sensible adaptations, each with a reason.

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