According to the World Health Organisation (WHO), obesity is a global health problem that has reached epidemic proportions. Our modern lifestyle means that we expend limited calorific output and spend an increased amount of time engaged in sedentary activities. We are inundated with relatively inexpensive, high calorie food and drink and we now consume larger portions than our predecessors. Consequently 67% of men and 57% of women in the UK are overweight or obese and the UK has the third highest rate of excess weight in Western Europe behind Iceland and Malta.