An additional indicator would be evidence of a high infant mortality rate, although the preservation of children"s skeletal remains is invariably more difficult than that of adult bones due to differential conservation processes, and this could represent an insurmountable bias in the results. Changes in health status can be used to ascertain cultural and ancestral transitions too. In this sense, probably the most striking change observed is between hunter-gatherers and the first farmers in Europe. The latter not only show signs of poorer health – such as cavities, almost unknown by the former – but also higher infant mortality rates and even lower stature than previous hunter-gatherers.