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Diet imbalance and deficiency

Science · Organisms & Life Processes · ages 11-13

Name ______________________ Date ____________

Which condition can result from a severe, prolonged shortage of food energy?
- Obesity
- Starvation
- Scurvy
Over time, what can happen to food energy taken in beyond what the body uses?
- It always leaves the body without being stored.
- It can be stored in body fat.
- It is changed into a supply of vitamins.
A prolonged shortage of vitamin C can cause scurvy.
Circle one: True False
These example values are not eating targets and cannot diagnose obesity. What energy surplus does the chart show?
- 1500 kJ surplus
- 8000 kJ surplus
- 17500 kJ surplus
A child has a prolonged vitamin D deficiency. Which condition could this contribute to?
- Rickets
- Scurvy
- Starvation
Why might a nutrient deficiency take weeks or months to show symptoms?
- The body replaces every missing nutrient with extra food energy.
- Deficiency diseases affect adults but can never affect children.
- Stores of some nutrients support the body for a while.
In a calculation example, energy intake exceeds energy use by 500 kJ each day for 10 days. What is the total surplus in kJ?
Answer: ______________
Jamal is receiving medical care for a nutrient deficiency. His nutrient supply is now adequate, but damaged tissues have not healed after one day. He says this proves the care cannot help. Which explanation best evaluates his claim?
- His damaged tissues should already be healed because his nutrient supply is now adequate.
- His body may use extra food energy to replace the nutrient and repair the damaged tissues.
- His tissues may still need time to heal even though his nutrient supply is now adequate.

Answer key

For grown-ups. Fold this page away before handing over the rest.

Diet imbalance and deficiency W1-mt_NZHFcEtTyI-s1

Starvation · Starvation involves a severe shortage of food energy. A prolonged shortage can harm growth, repair and organ function.
It can be stored in body fat. · Surplus energy can be stored as fat. A repeated surplus can increase body fat, but it does not by itself give a diagnosis.
True · True. Vitamin C is needed to make collagen for body tissues. A prolonged shortage can cause scurvy.
1500 kJ surplus · Subtract energy used from energy eaten: 9500 − 8000 = 1500 kJ surplus. The energy used alone and the sum of both values are not the surplus.
Rickets · Vitamin D deficiency can contribute to rickets, in which growing bones do not harden properly. Too little calcium can also cause rickets.
Stores of some nutrients support the body for a while. · Stores of some nutrients can support the body for a time. Symptoms may develop as the shortage continues. Timing varies with the nutrient and person.
5000 · Multiply the daily surplus by the number of days: 500 × 10 = 5000 kJ. This totals energy; it does not predict an exact weight change.
His tissues may still need time to heal even though his nutrient supply is now adequate. · Restoring nutrient supply does not instantly repair damaged tissues. Healing can take time, so the remaining damage after one day does not by itself prove that care cannot help. Recovery time varies.