Use your brain power :
How do preparations like yoghurt, idli, dosa become easy to digest?

Explanation

Preparations like idli-dosa are made from the batter that is fermented. Yoghurt is also set with help of useful bacteria which carry out fermentation. The process of fermentation increases the volume of the substance and make them light, tasty and more nourishing due to increased vitamin content. Therefore, they are easy to digest.