text: When used as an ingredient in food, antifoaming agents are intended to curb effusion or effervescence in preparation or serving. The agents are included in a variety of foods and in materials for food preparation; McDonald's includes polydimethylsiloxane (a type of silicone) in its oil to mitigate hazardous splashes of oil caused by foaming in fryers, so it has been listed as an ingredient in their chicken nuggets, french fries, and other fried menu items.