My money's on UPF consumption - and not necessarily because so many people worldwide have waistlines expanding at an unprecedented rate of knots; rather that they're consuming chemically-infused "food", the long-term effects of which are not yet properly understood (at least by unsuspecting consumers).Yes, that could also be so, although if there were many variants I would think there’d have to be one overwhelmingly dominant one to explain the explosion in T2D prevalence.
Correlation or causation? Who knows?