As a society we have a huge problem with people's mental states that seems like it is increasingly getting worse.
We are 100% what we eat. Skip b vitamins & iron and your body can not properly produce serotonin, and without that you become unstable.
We didn't even know about our gut bacteria bio-domes a few decades ago, and now we learn that they live throughout all body and even in our brains and help regulate certain functions in our body.
Our processed foods, artificial ingredients, and perservatives kill off some bacteria that humans have evolved with.
There are types that almost all adults have that less than one third of our children currently possess.
Hell, pills with healthy adults bacteria reversed some autistic behavior in children during some clinic tests.
Firearms are not making people kill themselves, our food industry is.