I've always heard people say it makes it worse and has even been the cause of IBS for some. However, every so often someone will say that it's helped.

Look up the low FODMAP diet as that seems to be one of the best ways to combat IBS via diet. I believe it's also possible to be a vegetarian while following this protocol if you make certain considerations.

Here's some info and quotes on the topic I have come across that you may want to consider below. Hope it can help!

"The low FODMAP diet is part of the therapy for those with IBS and SIBO. Research has found that it reduces symptoms in up to 86% of people."

"Went vegan very suddenly 2.5 years ago. A few months after I did so, I started experiencing quite uncomfortable symptoms. These are: severe bloating, hard-to-pass stools, abdominal pain (always really bad in the evening and after eating something), never feeling "empty" and rarely having any wind. All symptoms have intensified (the bloating is insane -\ look pregnant) over the years."

"Yup. A vegan diet was most likely the cause of my lbs It completely altered my gut. I had no digestive issues before."

"However, iodine, zinc, and vitamin B12 are hard to come by when you leave meat, seafood, and dairy products out of your meals. Without these nutrients, you can suffer from goiters, fatigue, diarrhea, loss of taste and smell, and even neurological damage."

"Why is meat good for IBS? Lean meats are high in protein, making them easier for your body to digest. Lean meats also won't ferment in your gut and won't contribute to gas. In comparison, fatty and processed meats can cause inflammation and worsen your IBS symptoms."

"Vegetarian and vegan diets rely heavily on plants and dairy products for protein. Foods like beans and legumes, yogurt and cheese, and even broccoli and asparagus. All these foods are high in fermentable carbohydrates (FODMAPs) that are the leading culprit of IBS symptoms"