Question

why do we need to include roughage in our diet

Answer 1

for proper digestion and to add bulk to the food

Answer 2

Because dietary fiber contributes very few calories, high-fiber foods, such as fruits and vegetables, are lower in calories than many low-fiber foods. Roughage also helps to keep you feeling full while eating fewer calories because it provides a lot of volume and it swells inside your stomach and digestive tract.

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