The following article recommends a healthy diet with a high fibre intake, which can help in protecting people against diverticular disease, haemorrhoids, constipation and chronic disease such as heart disease and type 2 diabetes. It provides information on what fibre is, what foods contain fibre and how much to eat.
https://www.continence.org.au/resources.php/01tG000000FQuDpIAL/healthy-diet-and-bowels