Moreover, diseases and conditions of later life occur in some individuals and not others because of the relationship between particular genetic constitutions and exposure to certain social and physical environments. Little is known, however, about the underlying causes of several conditions and why they are increasing in frequency (e.g., asthma).
Qui plus est, les maladies et les affections qui se manifestent plus tard dans la vie surviennent chez certaines personnes et non chez d’autres à cause des liens entre le bagage génétique particulier et l’exposition à certains environnements sociaux et physiques.