Caffeine consumed within a few hours before a meal may blunt appetite temporarily; however, these effects are short-lived and appear to have minimal impact on daily food intake. Since Celsius is high in caffeine, temporary appetite suppression may occur. However, it is unlikely to decrease food intake significantly. Caffeine consumed within a few hours before a meal may blunt appetite temporarily; however, these effects are short-lived and appear to have minimal impact on daily food intake. Since Celsius is high in caffeine, temporary appetite suppression may occur. However, it is unlikely to decrease food intake significantly.