The leavening agent at that time contained aluminum.

Long-term consumption of food containing aluminum additives can easily lead to excessive aluminum deposition in human brain tissue, leading to memory loss, mental retardation, slow action and aging. "In addition, excessive aluminum not only affects children's bone growth, but also causes neurological development damage in infants and young children, leading to mental retardation.

However, 14 issued an announcement to strictly restrict the use of aluminum-containing additives. Therefore, the leavening agent commonly used in fried dough sticks now does not contain aluminum, and limited use will not cause any harm.