For most toddlers, the odd sweet is a treat. But for Evan Grimes, just one mouthful of the wrong food could be deadly. If fed citric acid, a common food additive found in soft drinks and sweets, or bread, the toddler could face losing his sight permanently or even death if he didn't have his EpiPen.

His mother Toya, 28, first noticed her son's allergies when he was just two months old after the skin around his eyes became severely infected, and he scratched his skin raw.

A dermatologist suggested that Evan might be allergic to citric acid, as the attacks seemed to coincide. Evan was also tested positive for 46 allergies, including citric acid, potatoes, nuts, wheat and dairy and was referred to a paediatrician, a dermatologist, an allergist and a nutritionist to help keep his allergies at bay.

To prevent the long list of dangerous allergies from flaring up, Evan is only allowed to eat just 11 'safe' foods.

'I'm just terrified he'll get a hold of something he shouldn't,' his mother said.