Run it - gluten can mess up your gut's ability to absorb nutrients (especially vit B12) which makes you need to eat more to try to get the nutrients you're missing, which makes you gain weight anyway.
Your doc will do a blood screen and let you know which vits you need to take. My doc gave me the choice of B12 shots or B12 pills. Pills were cheaper, and I've got my B12 into the low-normal range now just using the pills.
I did lose a ton of weight when I finally got the last details of my gut worked out. Some has crept back on during my inactive winter, but I'm still in my healthy range and I feel much better than I used to.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson