This review explores the protective effects of polyphenols and their mechanisms in disease prevention and therapy. Polyphenols, found in various foods and drinks, have potent antioxidant and therapeutic properties, showing potential in preventing obesity, atherosclerosis, diabetes, hypertension, cancer, and neurological diseases. The review highlights the role of polyphenols in managing chronic diseases, emphasizing their bioavailability and interactions with gut microbiota. It discusses recent studies on their anticancer, anti-diabetic, anti-arthritis, and anti-microbial activities. Polyphenols modulate signaling pathways, reduce oxidative stress, and inhibit inflammation, contributing to their health benefits. The review also addresses challenges in polyphenol bioavailability and suggests future research directions, including the use of nano-carriers to enhance their therapeutic potential. Overall, polyphenols offer promising avenues for disease prevention and treatment through their diverse biological functions.This review explores the protective effects of polyphenols and their mechanisms in disease prevention and therapy. Polyphenols, found in various foods and drinks, have potent antioxidant and therapeutic properties, showing potential in preventing obesity, atherosclerosis, diabetes, hypertension, cancer, and neurological diseases. The review highlights the role of polyphenols in managing chronic diseases, emphasizing their bioavailability and interactions with gut microbiota. It discusses recent studies on their anticancer, anti-diabetic, anti-arthritis, and anti-microbial activities. Polyphenols modulate signaling pathways, reduce oxidative stress, and inhibit inflammation, contributing to their health benefits. The review also addresses challenges in polyphenol bioavailability and suggests future research directions, including the use of nano-carriers to enhance their therapeutic potential. Overall, polyphenols offer promising avenues for disease prevention and treatment through their diverse biological functions.