Assertion
In adults with advanced type 2 diabetes and severe kidney disease, starting an SGLT2 inhibitor instead of a GLP-1 receptor agonist is linked to a 5% lower chance of serious kidney complications, a 9% higher chance of needing dialysis, and no difference in heart events or death rates.
Most likely mechanism
SGLT2 inhibitors lower pressure in the kidney's main filters, which helps protect them, but they flood the lower parts of the kidney with sugar, causing those parts to break down faster. This leads to more kidney failure and earlier dialysis. GLP-1 drugs don't flood the kidney with sugar, so they preserve kidney tissue longer but don't reduce the pressure in the main filters as much. Both drugs affect the heart and lifespan the same way because they don't change how the heart or body uses energy.
Correlational