Polyphenols are secondary plant substances found in many types of fruit and vegetables. They are known for their health-promoting properties and are often associated with a variety of positive effects on the human body. Polyphenols have strong antioxidant properties, which means that they can neutralize free radicals responsible for oxidative damage and cell damage. Through their antioxidant protection, polyphenols can protect cells from damage and reduce the risk of various diseases such as cardiovascular disease, cancer and inflammatory diseases. Another important effect of polyphenols is their anti-inflammatory effect. Chronic inflammation is now considered to be the cause of many diseases. Polyphenols can reduce the production of pro-inflammatory substances and curb inflammation in the body. This contributes to general health and disease prevention. Some polyphenols are also associated with positive effects on brain health. They can improve cognitive function and reduce the risk of neurodegenerative diseases such as Alzheimer’s and Parkinson’s. Polyphenols may protect brain cells, improve communication between cells and slow the formation of plaques associated with these diseases. Polyphenols can also help regulate metabolism and weight by influencing the breakdown of fats and glucose metabolism. As a result, they can have a positive effect on body weight and the risk of obesity. It is important to note that the amount and type of polyphenols consumed can have an impact on their effectiveness. A balanced diet rich in fruits, vegetables, nuts and whole grains can be a good source of polyphenols. Some of the best sources of polyphenols are berries, green tea, olive oil, dark chocolate and red wine. Overall, regular intake of polyphenols through a healthy diet can help promote health, reduce the risk of certain diseases and improve overall well-being.