The study evaluates the effectiveness of ChatGPT in providing dietary advice for non-communicable diseases (NCDs). The research compares ChatGPT's responses with international guidelines and assesses its ability to manage complex cases involving multiple health conditions. Overall, ChatGPT offers clear and appropriate advice, with appropriateness ranging from 55.5% for sarcopenia to 73.3% for NAFLD. However, it provides contradictory or inappropriate advice in complex scenarios, such as managing overlapping conditions. The study concludes that while ChatGPT is reasonably accurate for general dietary advice, it cannot replace healthcare professionals in complex situations requiring customized strategies. The findings highlight the limitations of using chatbots for personalized nutrition advice and emphasize the importance of consulting healthcare providers for specific medical conditions.The study evaluates the effectiveness of ChatGPT in providing dietary advice for non-communicable diseases (NCDs). The research compares ChatGPT's responses with international guidelines and assesses its ability to manage complex cases involving multiple health conditions. Overall, ChatGPT offers clear and appropriate advice, with appropriateness ranging from 55.5% for sarcopenia to 73.3% for NAFLD. However, it provides contradictory or inappropriate advice in complex scenarios, such as managing overlapping conditions. The study concludes that while ChatGPT is reasonably accurate for general dietary advice, it cannot replace healthcare professionals in complex situations requiring customized strategies. The findings highlight the limitations of using chatbots for personalized nutrition advice and emphasize the importance of consulting healthcare providers for specific medical conditions.