this is a fair point, but still: sugar might just be a diabetes catalyst on the condition other large changes have occurred (low exercise, high processed food d

this is a fair point, but still: sugar might just be a diabetes catalyst on the condition other large changes have occurred (low exercise, high processed food diets, more stress etc.), and we don't know if the effect would've been the same since no conditions exist where diet, lifestyle and other factors remained completely static for a number of decades.