These disease and dietary insults interact with each other and with the surrounding economic, physical, and cultural environment. In this health complex, it is infectious disease and lack of medical knowledge which are the keys to ill health in poor nations. The human organism is constantly changing. We are our own authors. We believe in the plasticity and variability of the human organism.
Humans can mold their minds as well as their bodies.
During periods of change and rapid technologic development, men and women will respond to a broad spectrum of insults and opportunities in a highly variable, highly complex and highly individualistic fashion. However, the key point is that education of the individual can mold the mind and channel individual action to achieve community health. There are constant interactions between heredity, culture, and environment which mold and remodel individuals over short periods of time and cultures over longer spans of time. Variable behavioural traits constantly interact with variable environmental inputs to explain human evolution over time. Education is the key to development Human development depends on the internalisation of external inputs.