Credit: Everyday Health

One traditional hypothesis of depression is that people who are depressed have a deficiency in monoamine neurotransmitters in the body, which leads to low levels of neurotransmitters like serotonin and norephinephrine in the brainBut growing evidence supports that at least some forms of depression may also be linked to ongoing low-grade inflammation in the body.

Previous studies have linked depression with higher level of inflammatory markers compared to people who are not depressed. When people are given proinflammatory cytokines, people experience more symptoms of depression and anxiety. Chronically higher levels of inflammation due to medical illnesses are also associated with higherrates of depression. Even brain imaging of people with depression show that their brain scans have increased neuroinflammationWhen your body is in an inflammatory state fighting off the common cold or flu, you can experience symptoms overlapping with depression— disrupted sleep, depressed mood, fatigue, foggy-headedness, and impaired concentration.

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