Because underline causes are behavioural, need of assistance and collaboration with different disciplines are essential. Population strategy means good supply and capacity to make rational healthier personal choices. For instance, the idea that local shopkeepers have the ingredients, which are recommended for the population, is totally beyond medicine. This argument comes from the fact, that changes in risk factors reflect later changes in the incidence of the diseases. One of the major argument comes from the observation, that cases come from that part of the distribution, which is not regarded as a high risk.
Medical approach needs collaboration with social and political approach.
It is powerful, because total population benefits even though individuals do not have very big benefit. Finally, because lifestyle is socially conditioned, the acceptance of society is needed. There are also limitations in population approach. Acceptability, knowledge, attitudes and behaviour of the population may not match. We have very often difficulties as regard feasibility, for instance with governments.