Low-salt diet shuts-off perception of pain: Mechanistic insights into how caloric restriction functions as a pain medication:  Low-salt diet (0.075%) increases the expression of PD-L1, attenuates acute and chronic pain, and suppresses mechanical and thermal hypersensitivity and inhibits nociceptive neuron excitability, via up-regulation of its target gene, 29/April/2019, 10.04  pm