If you do not currently eat much fibre, increase the amount in your diet slowly, otherwise you may get bloating and wind. It is important to continue with a high-fibre diet even if the symptoms of constipation do not immediately improve as it may take up to 4 weeks to have an effect. You may also need to increase the volume of fluid that you drink, especially if you are increasing the amount of fibre you eat. Speak to your doctor before making any changes to your diet or the amounts that you eat and drink.
Attribution: BUPA