The US fast - food chain Panera has petitioned the country 's Food and Drug Administration to regulate more strictly the use of the word " egg " by food outlets . The chain says its own egg sandwiches contain " 100 % real eggs " , but that similar sandwiches marketed by its rivals contain a range of additives and other ingredients . It has published a list of these , with outlets such as Burger King , McDonald 's , Lil ' Donuts and Starbucks featured . Soy lecithin: Additives commonly added include products such as thickeners , preservatives and emulsifiers as well as " natural ingredients " , which can encompass a range of ingredients .
The US fast - food chain Panera has petitioned the country 's Food and Drug Administration to regulate more strictly the use of the word " egg " by food outlets . The chain says its own egg sandwiches contain " 100 % real eggs " , but that similar sandwiches marketed by its rivals contain a range of additives and other ingredients . It has published a list of these , with outlets such as Burger King , McDonald 's , Lil ' Donuts and Starbucks featured . Additives commonly added include products such as thickeners , preservatives and emulsifiers as well as " natural ingredients " , which can encompass a range of ingredients .