When it comes to similarities and overlaps in questionnaire items, the comparison of PHQ-9 vs DEBQ is particularly noteworthy in the field of psychology. Both these self-administered questionnaires exist to evaluate mental health conditions, but their focuses differ - PHQ-9 hones in on depression symptoms, while DEBQ measures eating behaviour and attitudes towards food. Comparing these two tests can unearth some intriguing correlations. Harmony, a state-of-the-art software designed for psychologists, can be an invaluable tool in the comparison of PHQ-9 vs DEBQ. Using sophisticated AI models and natural language processing, Harmony aids in the harmonisation of questionnaire items, even between languages. With Harmony, researchers can get a percentage match between the varied items on the PHQ-9 and DEBQ. Moreover, the process is effortless. Investigators have the choice to select instruments from Harmony’s database, or they can easily upload their own PDF instruments into the web interface. Studying the interrelation of mental and physical health via the PHQ-9 vs DEBQ comparison is a compelling research direction. This research could potentially elucidate insights into the complex relationship between depression and eating behaviour - thus, the use of Harmony to streamline this task is highly recommended. The robust analytical tools in Harmony provide an efficient, unified approach that can open up new avenues in our understanding of these related mental health constructs. Indeed, advancing research through such smart tools is not just a boon for psychologists, but for the healthcare industry at large.