Fault implies moral fault yet if dia=obesity incidence is increasing so dramatically then it implies that we are greedier and more slothful than our forebears, which I doubt. However whilst the orthodox belief is that excess fat and hence diabetes, is caused by 'eating too much and exercising too little' , it puts the onus on the individual. Then if that individual fails, kinder people will say they have a psychological problem with food (emotional eating) or will fat shame Females in pregnancy and teenagers are insulin resistant. Both conditions in which growth signals the need to build up supplies. Squirrels do the same and whales but is is functional and seasonal obesity to enable continuation of their species. Low carbers or ketonauts also get physiological IR so that glucose is spared for the brain, I think the term insulin resistant implies a fault as does the accompanying analogy of the gummed up lock and key whereas the body is doing what is meant to do and this only becomes pathological in the context of a diet high in processed carbs and especially fructose. However whilst there has always been obesity in history as well as gluttons and sloths, the increased prevalence of it these days implies that our morale fibre is lacking in comparison to our forebears and I don't believe that. Therefore it must come down to environment. I wonder if Henry VIII was the first person who died of diabetes? Obesity and a non healing leg ulcer...I would not want to go back in time to be the person to taste his pee though!