“…The study found that 80% of products adhered to the Iranian Traffic Light system after two years of voluntary compliance plus two more years of enforcement [33]. Overall, food retailers were the most common users of voluntary labels, labeling products of their own brands [20,31,35,45,49,55,57]. In contrast, manufacturers' brands had lower [31,50] and more selective uptakes [49,54], leaning towards displaying labels on products with healthier scores [27][28][29]35,37,42,50,51,55,57].…”