The human brain requires a constant supply of glucose for normal functioning, which is impaired by hypoglycaemia. As a consequence, cognitive and motor function can deteriorate rapidly with significant consequences. This has been studied extensively and it is known that hypoglycaemia affects various domains of cognitive function including short-term and working memory, attention, non-verbal intelligence, visual and auditory information processing, psychomotor function, spatial awareness, and executive functioning. However, to our knowledge, the effect of acute hypoglycaemia on social cognition has not been studied previously.