A portable, autonomous electronic device consisting of a barcode scanner, an updatable nutrition facts database, user memory to store product records of products eaten, and an integral readout display is disclosed that will allow a user to scan barcodes on food items consumed and keep a cumulative total of calories and other nutrients. Prepared packaged foods may have their barcodes read directly, while foods that are used in cooking or preparing other foods may be referenced by scanning from a printed generic foods barcode list provided with the device. Serving sizes can be adjusted to accurately reflect the intake of given food items. Daily cumulative totals of calories and several other nutrients can be displayed as bar graphs, and the incremental increase that would result from consuring a scanned item can be displayed with reference to what has already been consumed. Weekly calorie totals broken down by day can be displayed in order to give an estimation of how successfully the user has adhered to diet goals over a dietarily significant span of time. Barcode numbers of food items input into the device along with date and serving size consumed can be stored in user memory and downloaded to another device, for example a computer or printer, via an interface. Diet strategies can be personalized with respect to any one of or combination of several nutritional categories, such as calories, fat, etc.