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Obesity is the number one lifestyle contributor to Type II Diabetes. This is so well documented it's unbelievable you don't know it. But go here: http://diabetes.niddk.nih.gov/dm/pubs/riskfortype2/#2
Research has demonstrated beyond a shadow of a doubt that Type II Diabetes can be delayed and even prevented by weight management.
Diabetes does not, as you claim, only SEEM more prevalent. It is more prevalent - world wide. And the increase is directly linked to rising obesity levels. It is particularly alarming to note the increases among children and adolescents - again, worldwide.
See: "The global spread of type 2 diabetes mellitus in children and adolescents" by Orit Pinhas-Hamiel, M.D. and Philip Zeitler, M.D., Ph.D. The article appears in The Journal of Pediatrics, Volume 146, Number 5 (May 2005), published by Elsevier.