Systematic review of the association between dietary acid load, alkaline water and cancer
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A systematic review found no evidence supporting alkaline diet or alkaline water as a cancer-prevention or cancer-treatment strategy through systemic alkalization.
Qualifies
Diet changes renal acid load and urine pH, so the claim contains a real compartment-specific physiological effect that should not be dismissed.
Challenges
Respiratory and renal homeostasis keep healthy plasma pH within a narrow range, while diet-driven changes are much larger in urine than in blood.