Remember to increase your fibre intake gradually to avoid gastrointestinal symptoms such as bloating and gas and allow your gut to adjust to the higher intake. Remember to drink plenty of fluid, to allow the fibre to do its job properly, aiming for 8-10 cups of fluid per day at regular intervals. (NHS) https://www.uhnm.nhs.uk/media/3574/fibre.pdf (University Hospitals of North Midlands NHS Trust)
Gradually introduce high fibre foods over two to three weeks. It may take a few weeks to notice any improvement to your symptoms.
If you increase your fibre in your diet and are not drinking enough this may worsen your symptoms. Try to include high fibre foods at each mealtime every day (NHS) https://www.yorkhospitals.nhs.uk/seecmsfile/?id=1895