Diabetes is likely a factor: https://www.medscape.com/viewarticle/931132 https://www.medscape.com/viewarticle/931132 And obesity is strongly correlated with di

Diabetes is likely a factor: https://www.medscape.com/viewarticle/931132 https://www.medscape.com/viewarticle/931132 And obesity is strongly correlated with diabetes: https://www.diabetes.co.uk/diabetes-and-obesity.html https://www.diabetes.co.uk/diabetes-and-obesity.html There is a distinction to be drawn between obesity rates in the US and Japan and that might be part of the answer to your question.