An antifoaming agent is a food ingredient that intended to curb effusion or effervescence in preparation or serving. These are included in a variety of foods such as Diet Pepsi, Diet Coke, Sprite, and chicken nuggets in the form of polydimethylsiloxane. These agents are also used medicinally to relieve bloating, because they cause small bubbles to coalesce into large bubbles, which are passed more easily.