I've been six months gluten-free due to numerous health issues. I am a religious person, and haven't been one to swear or curse for the past 25 years.
About two years ago, I started having problems with constant self-condemning swearing in my mind. There was no apparent reason for it. It would happen hundreds of times a day, and I had no control over it. I worried that I was going crazy! I also experienced near-constant anxiety.
When my doctor asked me to try an elimination diet for other health issues, the swearing and anxiety unexpectedly stopped within one day. My mind was completely still and calm -- calmer than it had ever been in my entire life. I actually had a bit of an identity crisis without the base-level anxiety to which I was so accustomed! :-) Whenever I got glutened (or ate another food that I am sensitive to), the first sign that it had happened was that the swearing/anxiety came back.
I read some research online that said that cursing/swearing comes from a different part of the brain than normal language. This research said that it has an analgesic effect -- soothing pain. This is why people will often curse when they hit their thumb with a hammer or something. When I told my doctor about the swearing, he said, "It's probably just your body's response to pain."
Anybody else ever experienced anything like this? It is very sobering to me to think how much our minds can be affected by something as simple as food!