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In the above head - lined note (vide : BMJ 2019 ; 366 ; 14946), 'the four behavioral factors' considered were
smoking, diet, physical activity and body mass index.
The subjects were drawn exclusively from the British Civil Service.
Quantified inclusion of the magnitude of cognitive, neocortical cerebral activity of the study subjects would have been an interesting feature.
(Professionals in the British Civil Service are reputed to be exercising their brains all day, all year !).
No competing interests
16 August 2019
A.W. Amarasinghe, M.D.,
Mcdonough. Georgia 30253 , United States of America