I've suffered quite a lot from inflammatory responses to food (especially gluten and casein) and had mental symptoms similar to depression (not clinical though)

I've suffered quite a lot from inflammatory responses to food (especially gluten and casein) and had mental symptoms similar to depression (not clinical though). Water retention, pain, weakness, the whole lot. It took some years until I made the connection and have since stayed on a gluten- and casein-free diet, adding fish oil and apple cider vinegar. I lost > 30 pounds since (inflammation seems to cancel out weight loss) and feel great mentally (most of the time). Whenever I have a setback, I become irritable and depressive - usually quickly revertable by two fish oil capsules and a glass of diluted ACV (moodiness disappears within 2 hours; water retention takes 1-2 days to disappear again - this seems to be associated with the lymphatic system).