Water and minerals are essential in the human diet. List two other types of nutrient in a human diet.

1:    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2:    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
   

Outline the benefits of using iodine as a dietary supplement.

(essential) amino acids;
(essential) fatty acids / oils / lipids / fats;
vitamins;
carbohydrates;

a. iodine is a mineral that is often scarce in local diets/water supplies;
b.required for normal thyroid function/synthesise thyroxine;
c.prevents goitre/avoid iodine deficiency/avoid absorbing iodine–131/radioactiveiodine;
d.prevents brain damage;[

Knowledge of nutrients and the need for iodine was sound, although the word goiter was not well known. There was also good knowledge of the benefits and risks of a high protein diet, though many candidates did not score full marks.

Knowledge of nutrients and the need for iodine was sound, although the word goiter was not well known. There was also good knowledge of the benefits and risks of a high protein diet, though many candidates did not score full marks.