Systems and methods are disclosed for monitoring adherence to healthcare guidelines defining a recommended level of physical activity. Metabolic Equivalent (MET) data obtained for a user is compared to guideline MET values relating to the recommended level of physical activity, to determine whether the user has achieved the recommended level of physical activity. An adherence result is outputted in accordance with the result of the comparison, indicating whether the user has achieved the recommended level of physical activity. The adherence result can be outputted in the form of a message displayed on a display unit. In some embodiments it is checked whether sufficient MET data is available for a particular day, before comparing the MET data for that day to the guideline MET values. When MET data is captured over a plurality of days, it can be checked whether data has been captured for at least a minimum required number of days within a time period, for example one week.
