A study in Sleep reports on a link between cognition, sleep and a metabolite called kynurenic acid. The metabolite has previously been linked to schizophrenia.
Inflammatory factors appear to contribute to pregnancy-related depression onset and severity. Researchers found elevated levels of IL-6 and IL-8 and reduced levels of IL-2 in blood samples taken from blood samples of pregnant women who reported symptoms of depression. Additionally, they found serotonin was drastically reduced.
Researchers report exercise can produce changes in skeletal muscles which can purge the blood of a protein that accumulates during stress.