In addition to fat and sugars chocolate contains:

Antioxidants (phenols) which as many researchers believe help prevent cancer and promote cardiac health. The darker the chocolate, the more phenols it contains.

Tryptophan, a chemical that the brain uses to make a neurotransmitter called serotonin. High levels of serotonin can produce feelings of elation, even ecstasy.

Vitamin E: a fat-soluble vitamin essential for cell membranes.

Protein: required for cell maintenance and repair.

Copper: assists iron metabolism, synthesis of melanin (in hair and skin), and functioning of the central nervous system.

Calcium, phosphorus and magnesium: minerals essential for strong bones and teeth.

Iron: needed to form haemoglobin, the oxygen-carrying compound in blood.

Contrary to popular belief, chocolate contains only a limited amount of caffeine. An average chocolate bar contains about 30 mg of caffeine, while one cup of coffee contains 100 mg.