The peptides are chains of amino acids inside and outside of the nervous system. Endogenous morphins such as endorphins, are peptides that give pain relief. Angiotensin is yet another peptide that copes with the loss of fluid and create thirst. Finally the transmitter substance Substance P, brings information related to pain.
All three petides are influenced by an orthorexic lifestyle in particular #Orthorexia Athletica. Pain from over-exercising and lack of adequate restitution, the relief of pain and anxiety by endorphins as well as dehydration or salt deficiency is common.