In an environment where tiffin services are taken primarily by working professionals who after the age of 30 start showing serious lifestyle related health concerns, just counting calories doesn't impact health as much. It has been proven in studies that if the calorie count is the same, and "bad" calories are replaced by "good" calories, the impact on good health is substantial. Below the age of 30, counting calories at a desk job definitely helps as it keeps weight gain for a sedentary executive in check.