First of all, I appreciate that you're looking beyond medications alone. OCD and anxiety are complex conditions, and while medications can be very helpful, they often work best when combined with psychotherapy (especially CBT with Exposure and Response Prevention), good nutrition, regular exercise, quality sleep, stress management, and correction of any nutritional deficiencies.
Regarding your first question about the gut microbiome: yes, taking gut health seriously is worthwhile, but it's important to keep realistic expectations. Research shows there is a connection between the gut and the brain. A healthy gut microbiome may support mood, inflammation, and overall well-being.
As for your second question about omega-3: yes, omega-3 fatty acids are important for brain health. Since you don't eat fish, it's reasonable to pay attention to your omega-3 intake. Plant sources such as flaxseeds, chia seeds, walnuts, and canola oil provide ALA(Alpha lipoic acid).
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Overall, you're taking a thoughtful, comprehensive approach.
Nutrition, correcting deficiencies, gut health, and ensuring adequate omega-3 intake can all support your overall health, but they should complement—not replace—your psychiatric treatment and therapy."