The parts of plant foods that your body is not able to digest or absorb are called Dietary fibres, also known as roughage or bulk.
Dietary fibre, commonly referred to as roughage or bulk, refers to the components of plants that your body cannot digest or absorb. Fibre is not digested by your body, unlike other meal components such as lipids, proteins, or carbohydrates, which your body breaks down and absorbs. Instead, it passes through your stomach, small intestine, and colon, relatively undamaged, before exiting your body.
Dietary fibre has several health benefits. Dietary fibre intake appears to be associated with a lower risk of coronary heart disease, stroke, hypertension, diabetes, obesity, and some gastrointestinal illnesses in people. Increased fibre consumption decreases blood pressure and cholesterol levels in the blood.
Lentils and beans, Apples, Carrots, etc. are foods that contain high fibre content.