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.
Researchers report exercise can produce changes in skeletal muscles which can purge the blood of a protein that accumulates during stress.
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.