消化不良

indigestion  /,ɪndɪ’dʒestʃən/ noun

★ pain caused by difficulty in digesting food

・Rich food always gives me indigestion.

digest  /daɪ'dʒest/　/dɪ’dʒest/　verb 消化する

・Humans cannot digest plants such as grass.

・You should allow a little time after a meal for the food to digest.

When I go to a all you can eat restaurant, I sometimes feel bloated due to indigestion of  a meal.