It's official, our experts don't have a clue.

"Dr Marie Janson, from Alzheimer's Research UK, said the findings were interesting, and fitted in with "the bigger picture of a healthy lifestyle preventing Alzheimer's in later life".

She said it was "difficult" to work out what a mechanism linking calories and cognitive impairment would be."

The mechanism is staring her in the face: overdose of starches and sugars, and not enough dietary fats.
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