School dinner staff have been banned from serving triangular flapjacks after one was thrown and hurt a pupil.
Caterers at Castle View School in Canvey Island, Essex, have been told instead to cut their flapjacks into squares or rectangles.
The secondary school is yet to comment on the incident in which a boy was hit in the face.
Essex County Council confirmed the incident and the subsequent decision on flapjacks.
The county council has been asked what guidance it gives schools about shapes of foodstuffs and whether the school would be seeking to ban other triangular items, such as wedges of pizza.
The local education authority has yet to respond.
Health and safety advisor Ray Hurst said he could not understand why triangular flapjacks had been banned, but not those cut into squares or rectangles.
"Anything that is thrown is likely to cause injury if it hits somebody, especially in the face or the eye," said Mr Hurst, former president of the Institution of Occupational Safety and Health.
"It does seem a little over the top to ban triangular flapjacks," he said.