Apart from depression and anxiety, the following mental symptoms are reported in cases of food intolerance: fatigue, mental exhaustion and confusion, inability to concentrate, poor memory, insomnia, tension, dizziness, disorientation, over-excitement, ‘nervousness’, irritability, violent mood-swings and aggressive behaviour. In children, hyperactivity is frequently reported, while in adults the most common symptom is excessive fatigue that is not relieved by rest. Children may also show great lethargy and drowsiness. Some doctors interpret both fatigue and hyperactivity as part of a common set of reactions which they describe as the ‘tension-fatigue’ syndrome, in which the patient may be profoundly tired or tense and irritable, or both. For many, the fatigue is worst in the morning, so that the patient has difficulty in waking up and feels ghastly on getting out of bed. As the day progresses the fatigue begins to clear.

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