Abstract: A set of volumetric measuring devices or portioning scoops are used in a weight loss and weight maintenance program. Each scoop is configured to measure a single portion size for any particular food in a respective food category. Single portions of foods are measured by the scoop for the category that limits the calorie value of the food portion within a small range. For some foods, a single portion size may be one measured volume of a scoop, whereas for other foods a single portion may two or more measured volumes of the scoop. Over time (e.g., a week or a month), the calorie intake from foods measured with a particular scoop will average to a desired amount within the parameters of the program. A chart may be used in conjunction with the scoops depicting the respective categories, foods in each category of food, and a number of volumes of each scoop corresponding to a portion size.