The researchers worried if a condition called “hyperfiltration” was now a problem, and it wasn’t:
“To examine potential signs of hyperfiltration as a basis to the eGFR increase in the KD group, we analyzed the albumin-to-creatinine ratio. There was no significant difference of the albumin-to-creatinine ratio between the control and the KD/WF groups (KD, p = 0.196; WF, p = 0.704). Also, the ratio of alpha-1-microglobulin to creatinine, as a marker of potential differences in tubular damage, showed no significant differences in the change from BL to EOT between groups.”
Do note such diet changes should be run by your doctor, with such a condition.