A low phenol/salicylate diet is often implemented along with another diet program.  Many children with autism cannot process phenols adequately so high phenol foods must be eliminated.

Symptoms of phenol intolerance:

Dark circles under the eyes

Red cheeks, red ears

Self-injury

Head banging

Aggression

Poor impulse control

It can be impossible to eliminate all phenols so enzymes may be recommended to break down remaining phenols.

THIS CHART is incredibly helpful when watching phenols/salicylates. The fifth column indicates the phenol/salicylate content in common foods.

You can find another guide for phenol/salicylate levels in foods HERE.