A method of controlling a display device carried by a housing of a blood glucose measuring device, the blood glucose measuring device comprising: a blood glucose measuring facility positioned in the housing and configured to measure a concentration of glucose in a blood sample deposited on a sample carrier received in the blood glucose measuring facility, and a processor including a memory having instructions stored therein that are executable by the processor: to control a bolus recommendation process that recommends a bolus amount of a blood glucose modifying drug based on a number of factors including a carbohydrate value entered by a user, wherein the entered carbohydrate value corresponds to a carbohydrate content of a meal or snack that was just taken, and to control the display device, after a programmable amount of time has passed since entering the carbohydrate value, to display instructions to measure a concentration of blood glucose of a blood sample via the blood glucose measuring facility if the carbohydrate value entered by the user is greater than a carbohydrate limit, the method comprising: displaying a data field on the display device, executing an editing process that provides for editing of the data field displayed on the display device, and magnifying the data field on the display device relative to other portions of the display device when selected for editing according to the editing process. a blood glucose measuring facility positioned in the housing and configured to measure a concentration of glucose in a blood sample deposited on a sample carrier received in the blood glucose measuring facility, and a processor including a memory having instructions stored therein that are executable by the processor: to control a bolus recommendation process that recommends a bolus amount of a blood glucose modifying drug based on a number of factors including a carbohydrate value entered by a user, wherein the entered carbohydrate value corresponds to a carbohydrate content of a meal or snack that was just taken, and to control the display device, after a programmable amount of time has passed since entering the carbohydrate value, to display instructions to measure a concentration of blood glucose of a blood sample via the blood glucose measuring facility if the carbohydrate value entered by the user is greater than a carbohydrate limit, to control a bolus recommendation process that recommends a bolus amount of a blood glucose modifying drug based on a number of factors including a carbohydrate value entered by a user, wherein the entered carbohydrate value corresponds to a carbohydrate content of a meal or snack that was just taken, and to control the display device, after a programmable amount of time has passed since entering the carbohydrate value, to display instructions to measure a concentration of blood glucose of a blood sample via the blood glucose measuring facility if the carbohydrate value entered by the user is greater than a carbohydrate limit, the method comprising: displaying a data field on the display device, executing an editing process that provides for editing of the data field displayed on the display device, and magnifying the data field on the display device relative to other portions of the display device when selected for editing according to the editing process. displaying a data field on the display device, executing an editing process that provides for editing of the data field displayed on the display device, and magnifying the data field on the display device relative to other portions of the display device when selected for editing according to the editing process.