Julia is 83 and participates in a seniors' exercise group. mark and maria, who are the same age as julia, participate in a book club and meet twice a week with friends for coffee. bob, also 83, spends most of his time watching television. all else being equal, who among them is most likely to develop dementia?

Among the two of them, Bob is most likely to develop dementia. It has been shown that high blood pressure, obesity and high cholesterol are risk factors for dementia. Keeping a healthy lifestyle, with a healthy diet and healthy blood levels of cholesterol and sugar are very important factors for reducing the risk of dementia. Also, regular exercise has been associated with reduced risk of dementia. 

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