The study looked at around 5400 people over the age of 55, who showed signs of dementia and followed these
patients over a period of 14 years. They looked at home many of these people went on to develop dementia and took into account the differences in their nutritional data. They found no difference in risk when comparing people who had diets rich in anti-oxidants to those who had a lower intake.
However this doesn’t mean you should stop taking anti-oxidants. For instance there is evidence that high levels of naturally occurring vitamin E in avocadoes and nuts may help ward off depression, and that the vitamin C in
citrus fruit, seems to protect against stroke. There is also evidence that strawberries and blueberries help slow mental decline.
So the advice is still to make sure that you have brightly coloured fruits and vegetables in every meal. The take home message is that they do have specific health benefits, but that it is quality rather than quantity that seems to deliver the benefit.