An interesting study involving more than 120,000 US subjects, some studied over more than 20 years (using a combination of measures and self-reported diets and life style activities), has suggested that a diet rich in brightly-coloured fruit and vegetables, rich in flavinoids, helps to limit weight gain especially in middle age (http://www.theguardian.com/lifeandstyle/2016/jan/27/natural-compound-fruit-veg-flavonoids-help-prevent-weight-gain-study). This is interpreted as a possible help to countering the obesity epidemic (with its linkage to a variety of diseases including diabetes) but the association with these 'super foods' may be a bit more complex than meets the eye. The diets seem to have been self-selected and it is possible that the subjects eating blue berries, strawberries, cherries, citrus fruits, aubergines et cetera and drank tea were the kind of people who would be health conscious and keen to keep their weights down. These foods are also generally rich in fibre and would fill without fattening. Having said that, they sound like good food items to me!
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