[flybrand]

Depression is a symptom of celiac disease, which is a result of gluten in the diet, another symptom of which is poor gut Microbiome health.

I bring up Celiac because 1/ I have it, and 2/ there is very little medical doubt / uncertainty / controversy about the disease.

[alacombe]

Hasty generalization fallacy right here.

[Ovah]

Technically speaking depression is not a symptom. It's diagnosis in its own right.