In the current review, a biopsychosocial perspective is applied to cur
rent changes in the health of populations. It is proposed that the psy
chosocial environments either promote health or precipitate disease. C
hanges in the types of stress that people experience as well as its pr
evalence over time are discussed. In addition, possible biological mec
hanisms linking the psychosocial environments to health are presented.
''Food for thought'' is the possible interaction between the physical
/chemical and the psychosocial environments and changes in health of i
ndividuals. Clearly, our traditional view of disease mechanisms is not
sufficient to understand recent phenomena, such as environmental illn
ess and chronic fatigue syndrome. Issues worthy of further discussions
are the role of the ''just-in-time'' society, where individuals incre
asingly have to change jobs, cope with reorganizations and increased p
roduction pressure, and its impact on health and well-being. Further,
in what way can we develop better models to truly assess the impact of
an increasingly complex interaction between individual and environmen
tal factors on health? A major obstacle to enhancing our understanding
of causes of change in the health of populations is the use of inappr
opriate or outdated statistical analytical models. Finally, it is sugg
ested that prospectively controlled studies of the impact on health of
changes in the health and welfare systems are carried out. This would
further add to our understanding of factors contributing to, changes
in the health of population. Copyright (C) 1996 Elsevier Science Ltd.