The nutritional labeling regulations for prepackaged foods based on the Codex Alimentarius legislation enacted in 2002 in Costa Rica. In the same year, a research was conducted in order to describe the baseline of nutritional labeling. The declared information on the labels of all prepackaged foods was collected, except for alcoholic beverages. Six variables were analyzed using SPSS. 2,910 labels of foods were reviewed and classified in 19 food categories. 58.4% (n = 1698) included nutritional information, proportion that varied by country of origin and food category. Of the labels that included nutritional information, 68.1% had nutritional panel, 1.2% nutrient claims and 27.4%, both. 95% of the nutritional components declared on the labels included energy and macronutrients data. At least 100 different nutritional and health claims were identified. Most frequently used claims were content (74.7%), followed by addition (16.9%). The components most frequently mentioned were vitamins and minerals, vitamins (alone), carbohydrates, total fat, cholesterol and energy. Food groups who reported these descriptors were: cereals and by products, baby foods, milks, beverages, foods for special dietary uses and substitutes. One to five descriptors were used in a label. In a decade the proportion of prepackaged foods with nutritional labeling tripled in the metropolitan area of Costa Rica. It is concluded that the tendency of nutrition information declaration is up, sustained and represents an accessible tool for health promotion, if the information provided is reliable and secure.