Why is milk a major source of iodine in the UK?

Cattle feed is supplemented with iodine, and iodine-based disinfectants are used on dairy farms. Iodine from both passes into the milk.

Why are people who avoid dairy products at risk of a low iodine intake?

Dairy foods are the main source of iodine in the UK, and most plant-based milks are not fortified with it. People on dairy-free diets need sources such as fish, eggs or an iodine-fortified plant milk.

Goitre is a swelling of the thyroid gland in the neck. Goitre develops when iodine deficiency makes the gland enlarge in an attempt to make enough hormone.

What are the effects of iodine deficiency in adults?

Iodine deficiency reduces thyroid hormone production, causing an underactive thyroid. Symptoms include tiredness, weight gain, feeling cold and goitre.

CCEA A-Level Nutrition and Food Science 3310

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Topic overview Functions of protein Amino acids, biological value and complementation Animal and plant sources of protein Novel protein sources Nitrogen balance and protein requirements

Fat

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Minerals

Iodine and fluorine

3 things to know
AS 1

Overview

Iodine and thyroid hormones, milk as a source, goitre and deficiency in pregnancy, iodised salt, and how fluoride protects teeth, with the effects of too little and too much.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

Why is iodine deficiency during pregnancy particularly harmful?

Key term

What is the function of iodine?

Key term

Name valuable food sources of iodine.

Questions from this subtopic

Each one with the model answer underneath.

1
What is the function of iodine?
Model answer
Iodine is needed to make the thyroid hormones thyroxine and triiodothyronine. Thyroid hormones control the metabolic rate and are essential for growth and brain development.
2
Name valuable food sources of iodine.
Model answer
Milk and dairy products are the main source of iodine in the UK diet. Sea fish, shellfish and eggs are also good sources.
3
Why is milk a major source of iodine in the UK?
Model answer
Cattle feed is supplemented with iodine, and iodine-based disinfectants are used on dairy farms. Iodine from both passes into the milk.
4
Why are people who avoid dairy products at risk of a low iodine intake?
Model answer
Dairy foods are the main source of iodine in the UK, and most plant-based milks are not fortified with it. People on dairy-free diets need sources such as fish, eggs or an iodine-fortified plant milk.
5
What is goitre?
Model answer
Goitre is a swelling of the thyroid gland in the neck. Goitre develops when iodine deficiency makes the gland enlarge in an attempt to make enough hormone.
6
What are the effects of iodine deficiency in adults?
Model answer
Iodine deficiency reduces thyroid hormone production, causing an underactive thyroid. Symptoms include tiredness, weight gain, feeling cold and goitre.

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Iodine and fluorine

Overview

What you need to know

Why is iodine deficiency during pregnancy particularly harmful?

What is the function of iodine?

Name valuable food sources of iodine.

Questions from this subtopic

What is the function of iodine?

Name valuable food sources of iodine.

Why is milk a major source of iodine in the UK?

Why are people who avoid dairy products at risk of a low iodine intake?

What is goitre?

What are the effects of iodine deficiency in adults?

Other ways to work this

What is inside Levo

The 3-step method, run for you

Cram a whole paper in one sitting

Blank Blitz makes facts automatic

Build It gets the exam shape right

Test It catches misconceptions

Brain Breaks between sessions

Every question in Minerals, on a schedule.