Keto and upcoming kidney operation

Hi there, 

I'm quite new to keto (I've been under 200g carbs for 2 weeks and now full keto for a week). My main aim with it is not for weight loss but improved performance during ultramarathons. However, I was informed earlier this week that in either early December or early January I'll be having a kidney removed (I'm donating and so my kidneys are in good health).

I'm just wondering if anyone could shed some scientific light on to if I should continue with keto, or if I'd be better returning to normal eating habits until my kidney function is as strong as its going to be on one kidney.

Thanks.