The '5 a day recommended daily allowance' of fruit and vegetables is really a minimum, determined in order to avoid malnutrition ailments... it is a good goal to aim for in the first instance, but more is better if you can.One simple rule to follow with fruit and vegetables is to try and go for a rainbow approach - a good variety of different colours - they all have their strong points: for example, purple tend to be rich in antioxidants, yellow in beta-carotenes, dark green are just…