Nice concept map to help revise this section:

Food and Digestion Concept Map from dhmcmillan

The six major nutrients (you also need fibre):

Science Bank 21 (Food & Digestion): part 1 – Food Tests; part 2 – the Digestive System (from 4m 40s); part 3- Digestive Enzymes (from 9m):

Here are the key terms and some definitions: Key Terms B4.1

Bitesize Top 20 Demos – Food as a Fuel (2m 16s).

Here’s a useful powerpoint, although it doesn’t cover everything we need to know:

Nutrients presentation from katmar62

The use of microorganisms in the manufacture of yoghurt, notes here and video here: