That’s good news since a high-fiber diet is linked to a lower risk for many chronic diseases and can help with weight control. But a sudden increase in fiber intake can sometimes cause bloating, cramping, and gas. It’s important to make sure you’re drinking plenty of fluids to help relieve those symptoms. It may also help to include some refined grains in your diet along with well-cooked vegetables at the beginning of your transition to a vegan diet. Gradually increasing your consumption of fiber-rich plant foods can give your body time to adjust.