Dietary fibre refers to indigestible parts of plant foods that pass through the digestive system. It includes polysaccharides, oligosaccharides, lignin and associated plant substances. Dietary fibre promotes beneficial effects like regular bowel movements and reduced blood cholesterol and blood glucose levels. Sources of fibre include whole grains, fruits, vegetables, beans and nuts. Adequate fibre intake is recommended for health, with potential benefits including reduced risk of obesity, heart disease, and colon cancer. However, suddenly increasing fibre intake can cause gastrointestinal issues in some people.