The first sentence is probably true, the second seems false.
"Results of experiments in human volunteers evaluated by researchers for the WHO report
(3) are in agreement with those in animal experiments and suggest the basic mechanism of the effects of water low in TDS (e.g. < 100 mg/L) on water and mineral homeostasis. Low-mineral water markedly: 1.) increased diuresis (almost by 20%, on average), body water volume, and serum sodium concentrations, 2.) decreased serum potassium concentration, and 3.) increased the
elimination of sodium, potassium, chloride, calcium and magnesium ions from the body"
