The natural colour of the foods you're drawn to may stimulate your appetite and help to make your meals enjoyable. But it also does more: it can show you whether you're eating high-vitality nourishing foods or not - and it can even suggest what nutrients that food is likely to contain.

High-vitality fruits and vegetables are full of life force, especially if they are organically grown: you can see it in their skin and taste it in their flesh. They are generally full of anti-oxidants, those vital little things that stop us from ageing too fast.

More surprisingly, they can influence your mood, stimulate your energy or help you to relax.