I eat a keto diet >95% of the time and notice that when I indulge in grains or sugar, 35-45 minutes later I get excruciating plantar fasciitis in both feet/shins and similar cramps in my left palm & forearm. It also makes me wonder if peripheral neuropathy with "burning" that some diabetics get is also a result of glucose + uric acid -> nerve pain. The ones I know who suffer from PN all follow the ADA diet, not keto.