This study carried out a case study on food GDAs （Guideline Daily Amounts） labeling in British. It was found that GDA_S labeling which has been implemented for over 20 years, changed from BOP （Back of Package） labeling to FOP labeling. The labeling shows the amount of energy, sugar, fat, saturated fat, and salt per serving, as well as the percentage of the recommended daily intake by using the specific nutrient system measurement model. The labeling lacks of color coding and visual icon, and its implementation is not as effective as most FOP labels. Therefore, it is suggested to display the nutrition information on FOP labeling in terms of food portion size units to facilitate consumers' attention and understanding.