<qa>  What is the most serious disease in the world?Prevalence of obesity has been increasing rapidly worldwide. Overweight and obesity prevalence surged to 35.1 according to China Noncommunicable Disease Surveillance 2010. An estimated 44 of the burden for diabetes has been attributed to these weight problems, as well as 23 and 7-41 of the burdens for ischaemic heart disease and specific cancers. So now, obesity is a very serious disease, and it is not easy to lose weight or maintain proper weight. 