Earlier quoted context omitted.
Can you list anything specifically that anyone is likely to encounter? Your comments are rather vague.
The field is so vast that it depends on what you want to look at. So for e.g. When you consume a high protein diet (proteins > purine > uric acid) you can have problems with your kidneys. I've seen reports of people ending up in the hospital because the body couldn't regulate blood glucose, caused by a low-carb diet. Now, since its more ethical to experiment on rats, you can find numerous studies which show problems…
Edit: My mistake, it looks like someone else made the following mistaken argument, first - not you. My apologies.
[ Elsewhere in this thread your invocation of kidney problems was already corrected, and yet you invoke it here, again. This has everything to do with over-consumption of protein, nothing to do with a supposed "carb deficiency". This is not evidence of any alleged "impairment" resulting from insufficient carbohydrates. ]