This is crazy. You lost 28 lbs (15% of your body weight) in 10 weeks. Why did your doctor to allow you to continue? By any common sense, that is an unhealthy pace to lose body weight.
It seems to be more complicated (or unpredictable?) than that:
> In this study, rapid weight loss was associated with the loss of kidney function in males with normal weight, and with improvement of kidney function in overweight males.
> Our study showed that BMI and BMI change were not associated with eGFR change in females.