The pie charts represent the proportions of different nutrients found in food substances P, Q, R and S (key: water, fats, proteins, carbohydrates). P is mostly carbohydrate; Q is mostly protein with a large fat portion; S is mostly water; R is about half protein and a quarter carbohydrate.

1. aState, with a reason, which food substance is the best source of energy. [2]
2. bAn unborn baby was suspected to be underweight. Which food substance would be best recommended to the mother? [1]
3. cExplain your answer. [1]
4. dState, with a reason, which food substance would most likely lead to heart related diseases if eaten for a long time. [2]
5. eState the end product in the digestion of carbohydrates. [1]

You'll mark your own answer against the marking guide when you hand it in.