Why no grains on Ekadashi days?

Ekadashi fasting food excludes meat, grains, and fish. Instead, fruits, milk and milk-based products and non-grain products are to be eaten. If you are observing Ekadashi fast for the first time and don’t know what to eat, try to avoid flour, rice, wheat, pulses, onion, and garlic. On the other hand, various kinds of fruits, paneer, ghee, makhana, singhare ke atta, kuttu ka atta, and rajgira ka atta can be consumed. Those who are observing the extreme variant of this fast (i.e. Nirjala Ekadashi) must not drink water. Smoking and drinking alcohol are strictly prohibited during the fast. Ever wondered why Ekadashi fasting is so important?