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> It does not seem to affect cognitive ability

Is that the case long term though? It would be interesting to study the progression of people over the next decade or few to see if it seems to speed up the onset of age related dementia or increase susceptibility to other conditions and illnesses.

Also what about long term affects? Maybe it doesn't affect my cognitive ability now, but will it make me more susceptible to dementia?

I'd be interested in seeing if the effect is continuous or happens more at certain ages. Like take a group of people who are obese and say in there 40s, half were obese since they were children, and half became obese after 25 or so. See if there is any difference in brain development if the person was obese while they were still developing.

Not sure how you would account for effects of just being obese longer in general tho.