Our mood is governed by body chemicals called neurotransmitters, and what we eat may be influencing how we feel. When our body produces enough of the neurotransmitter serotonin, for example, we feel calm and unbothered, and we sleep well; digestion is improved too, and appetite is reduced - perhaps because we're not anxious. Our body makes serotonin from the amino acid tryptophan, which we get from fish, turkey, chicken, cheese, beans, tofu, oats and eggs. We can also make serotonin from a natural amino called 5HTP, as a supplement, which is best taken at night.

Take one tablet daily, preferably on an empty stomach or a carbohydrate snack. Children over 8 years old should take no more than ½ tablet a day. Adult maximum dosage no more than 3 tablets a day or as your health professional advises.