I once TA'd a statistics class in which the chocolate/Nobel Prize thing was used as the prototypical example for why correlation doesn't equal causation. Scientific American describes some problems with the study and plausible alternative explanations.
On the other hand, the cocoa may have some health benefits with respect to all-cause mortality, and the flavonoids likely have cognitive and other health benefits.
On the other other hand, the sugar surely doesn't, and chocolate has a lot of aluminum and maybe lead -- the latter is definitely not good for your brain, and the former might not be.
In any case, if you're going to take it up for health reasons, a spoonful of unsweetened cocoa in your oatmeal or coffee every morning is probably better than a Cadbury's egg.
chocolate has a lot of aluminum
Let's follow your link. It says:
...Extended data on the aluminium content of food items in France are available from the 1st French Total Diet Study, conducted in 2000. The results showed that an aluminium level > 3 mg/kg fresh weight was only observed in the following food groups: ‘Bread & rusk’ (4.1 mg/kg), ‘Biscuits’ (5.3 mg/kg), ‘Vegetables’ (3.2 mg/kg), ‘Nuts and oilseed’ (4.1 mg/kg), ‘Ice-cream’ (3.9 mg/kg), ‘Chocolate’ (3.7 mg/kg), ‘Salads’ (4.9 mg/kg) and ‘Shellfish’ (17.1 mg/kg) (Leblanc et al., 2005). Mush
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