Functional foods are dietary items that, in addition to providing nutrients and energy, help the body adjust one or more specific functions by improving a physiological response and/or lowering the risk of disease. Functional foods are not required in the diet and do not treat or prevent illnesses on their own. Nutraceuticals, often known as functional foods, are foods that give both health and nutrition benefits, such as lowering the risk of chronic diseases. Natural foods, such as antioxidants, dietary supplements, fortified dairy products, and citrus fruits, as well as vitamins, minerals, herbals, milk, and cereals, are examples of nutraceuticals. A whole ingredient or a portion of a food that is used as food for specialised therapeutic purposes is known as functional food. Conventional and modified functional foods are the two broad groups. Conventional functional foods are made up of natural or whole-food elements that deliver functional compounds, whereas modified functional foods are made up of additional ingredients added for specific health benefits.