Oats
Low-GI carbohydrates such as oats, pulses and wholegrain rice and pasta release glucose slowly into the blood stream, which helps to keep your blood sugar and your mood stable – and they give a boost to your immune system. US scientists Judith and Richard Wurtman, who pioneered research into the food/mood connection, found carbohydrates play a key role in enabling tryptophan, an amino acid that’s converted into the neurotransmitter serotonin, to enter the brain. As well as improving your sense of wellbeing and happiness, serotonin is also thought to help regulate appetite and sleep patterns.