A H M Fahad is a PhD student in Systems Bioinformatics at the Graduate School of Medicine, Yamaguchi University, Japan. He is a medical doctor from Bangladesh with prior experience in government policy making and healthcare delovery. His research focuses on the application of artificial intelligence, machine learning, and statistical modeling to understand complex biological systems, particularly the relationship between the gut microbiome, multimodal biomarkers, and cognitive function in aging populations. He is currently involved in a prospective cohort study integrating biochemical, metabolic, microbiome, imaging, and physiological data to develop explainable AI models for early prediction of cognitive decline. His broader research interest includes translational AI in medicine, with a long-term goal of developing AI-based clinical decision-support systems to assist physicians in diagnosis and treatment.