A balanced state of dosha is not just health but just absence of disease. It is necessary to get involved & look at factors like lifestyle, diet etc.
VPK are changing with every moment, they are dynamic principles that react with time, environment and lifestyle/ diet as mentioned above. And because of this can never truly be in perfect balance.
When you attempt to bring balance to the doshas this in itself reduces the chances of disease.
Astanga Hridaya Sutra Sthan