According to the WHO definition of Health - Health is a state of complete physical, mental and social well-being.
     University of Washington, USA stady*: Over 95 percent of the world's population has health problems.      We should not blame heredity.
     Twin studies have been an integral part of science because of the unique genetic similarities between twin siblings. Identical twins develop from a single fertilized egg and they have the same genome. This means that any differences between the twins are due to their environment, not their genetics. For nearly a century scientists have used twin studies to better understand the extent to which certain traits are inherited.
     Experts say, populations health depends on lifestyle by 50-55%, on the environment by 20%, on genetic predisposition by 18-20%, of public health only by 8-10%. ( Neurology: national direction / edited by E.I. Gusev, A.N. Konovalov, V.I. Skvortsova , A.B. Hecht - GEOTAR - Media , 2009),(neurology), (jamanetwork).

Used: wikipedia