A practical food is a food professed to have an extra capacity (frequently one identified with wellbeing advancement or sickness counteraction) by including new fixings or a greater amount of existing ingredients. The term may likewise apply to qualities deliberately reproduced into existing palatable plants, for example, purple or gold potatoes having enhanced anthocyanin or carotenoid substance, respectively. Functional nourishments might be "intended to have physiological advantages and additionally lessen the danger of interminable ailment past fundamental healthful capacities, and might be comparative in appearance to customary food and devoured as a feature of a standard diet". One of the explanations behind the adequacy of useful food sources is the patient's better consistence with these items, which causes better follow of routine by patients.