Iodised salt can prevent iodine deficiency

Iodised salt can prevent iodine deficiency

ZIMSEC O Level Combined Science Notes: Deficiency Diseases

  • A person might suffer from a deficiency disease if their diet lacks certain essential minerals and vitamins
  • Two essential minerals and vitamins are:
  • Iodine and
  • Vitamins


Goitre is a sign of iodine deficiency. Image credit

Goitre is a sign of iodine deficiency. Image credit

  • Is a naturally occurring mineral element
  • However some people do not get it in enough quantities naturally
  • Iodine is required by the thyroid gland found in the neck
  • As part of the body’s metabolism in order to make a substance known as thyroxine which regulates growth and development

Symptoms of iodine deficiency

  • In children there might be stunted physical and mental growth
  • Adults might develop a goitre
  • A goitre is a swelling of the thyroid gland.
  • In children mental development might slow down their physical and mental development
  • Resulting in children referred to as cretins

Overcoming iodine deficiency

  • This can be overcome by using iodised salt

Vitamin A

  • Is found in foods like fresh vegetables and liver

Symptoms of Vitamin A deficiency

  • Poor development of the trachea lining
  • This results in opportunistic infections of the trachea and bronchi
  • Poor night vision/Night blindness

Overcoming the deficiency

  • Eating food rich in vitamin A
  • Such foods include  dairy produce (cheese, milk, ice cream etc), carrots, cabbage and tomatoes

NB All these deficiency symptoms and others can be avoided by eating a balanced diet.

To access more topics go to the Combined Science Notes page.

Quick NetOne, Telecel, Africom, And Econet Airtime Recharge

If anything goes wrong, chat with us using the chat feature at the bottom right of this screen