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How to treat ibs with constipation 
Add high fiber foods to your diet. 
Incorporate whole grains, fruits, vegetables, beans, seeds, and nuts into your diet to gradually increase your fiber intake. Women should try to eat 21-25 grams of fiber a day, while men should try to eat 30-38 grams of fiber a day.
Fiber helps ease constipation and encourages regular bowel movements. Talk to your doctor about fiber supplements if you have trouble reaching your fiber goals with diet alone.