Six weeks ago I was diagnosed with a vitamin D deficiency where my levels were less than half of what they should've been so they were VERY low! This explains why I was feeling so exhausted all the time to the point I didn't want to move my limbs. So, I got prescribed a strong supplement to take once a week for 3 months..
Unexpectedly my IBS has vastly improved following taking these supplements. I looked it up online and found scientific research that states that IBS is very common in those with vitamin D deficiencies and symptoms improved upon increasingly levels of vitamin D.
Before I was diagnosed with the deficiency my bowel movements were the worst they ever were. For months I was ill most mornings for no reason (as I hadn't eaten any of my trigger foods) and I was getting really upset over it. Now I haven't had any loose stools since and have gotten out of the habit of needing the loo 20 minutes after eating breakfast every day. It's taken some getting used to feeling rather normal again!
Therefore, I highly recommend if you're struggling with your IBS and feel very fatigued and have other symptoms like lack of concentration and hair loss (like me) go to your doctor and check your vitamin D levels. You may be lucky like me and have the chance to improve your IBS for the better.
I just thought I'd share this with you all as I had no clue how this deficiency could impact my IBS!