A high-fibre diet is one that includes a significant amount of dietary fibre, typically over 25 grams per day for adults, derived from fruits, vegetables, whole grains, and legumes. This diet is clinically relevant as it promotes digestive health, aids in weight management, and may reduce the risk of chronic diseases such as type 2 diabetes and cardiovascular disease. A key association is its role in preventing constipation and diverticular disease, highlighting its importance in gastrointestinal health.