New Delhi, Jan 6 (ANI): Health of most adults who are considered "healthy obese" declines overtime, claims a new study.According to a study "healthy" obesity is a misleading concept and health obesity is defined as obesity with no metabolic risk factors.Core assumption of healthy obesity has been that it is stable over time, but they have now found that healthy obese adults tend to become unhealthy obese in the long-term, with about half making this transition over 20 years. Healthy obese adults were also much more likely to become unhealthy obese than healthy or unhealthy non-obese adults, indicating that healthy obesity is a high-risk state with serious implications for disease risk. Healthy obesity is only valid if it is stable over time, and the study indicated that it was often just a phase.