More and more research is pointing in the direction that depression might be associated with chronic inflammation. And thus explaining why an anti-inflammatory nutrition strategy like including plenty of fish oil, turmeric, broccoli etc. has shown to be valuable in treating depression.
Fish oil is by far one of the most efficient and simple things you can do to bring down inflammation quickly.
Many brands are unfortunately a waste of money, because they are rancid or the potency is too low - meaning that you would need to empty half the bottle to get enough EPA to reach a therapeutic dosage. I recommend Nordic Naturals as one of the better and cleaner brands - you will need to take 4 caps daily to reach an efficient therapeutic dosage of around 1500-2000mg EPA.
Inflammation is the body's natural response to injury.
We need inflammation to repair - so we do not want to suppress it, but we do want to fix the triggers that are causing ongoing inflammation in the body. When the triggers continue on - because of a diet of high-sugar and bad-quality fatty foods, too much body fat, heavy metal toxicity and smoking, the immune system can spiral out of control and increase the risk for disease.
In some instances, depression may be a sign of an underlying inflammatory process.
When inflammation becomes chronic it has been shown to damage heart valves and brain cells, trigger strokes, and promote resistance to insulin, which leads to diabetes. Fix the inflammation and this may may the only thing you need to fix your damaged brain.
Reference: Almond M. “Depression and inflammation: Examining the link.” Current Psychiatry. 2013 June;12(6):24-32.