Patients will be asked to wear an accelerometer for four consecutive days to obtain an objective measure of physical activity. During the same four days the patients will maintain a four-day food record of all food and beverages consumed. This will provide a means of assessing energy intake verses energy output. Patients will also complete the Modifiable Activity Questionnaire (MAQ). Energy expenditure and dietary intake will be assessed at baseline, weeks 4, 6 and 10.