How do i prevent constipation and bloating while dieting?

KeepActivity&HiFiber: foods up. Activity: walking/running, etc. most effective. Also very effective is ↑ed quantities of high fiber/low nutritional value vegetable based foods, e.g. lettuce, cauliflower, broccoli, celery, etc.; raw potentially more effective than cooked. Fiber supplements a back up option. Study: https://www.healthtap.com/#user_questions/6660531, other answers, wikipedia, etc. for more understanding.