Early Detection Allows Changes
As we all know, the connection between the body and the mind, as well as the physical body and the emotional body, is one of much overlapping. In much of western society, by the time an imbalance is learned of, there is already a physical manifestation present. Disease, for example, often begins much much earlier than the onset of symptoms. There are a few occasions where there can be a sneak-peak of what's going on in the body. Take breast thermography, for example.
Changes in blood flow patterns, for example, can indicate areas of higher metabolism that have yet to develop into anything a doctor could see via mammography or find via biopsy. This means that lifestyle changes, at this very early period, could actually help to prevent some of the issues that could - but haven't yet - developed.