There is no commonly agreed definition of the term "malnutrition." It's been used to define a nutrient deficit, excess, or imbalance that has a detectable negative impact on body composition, function, and clinical outcome. Malnutrition is a prevalent, under-diagnosed, and under-treated condition that patients and physicians must deal with. It is both a cause and a result of disease, and it can be found in both institutional and community settings. Approximately 5% of the UK population is underweight, with a BMI of less than 20 kg/m2, while obese people who lose weight accidentally and have a BMI within the normal range are also at risk of malnutrition. Undernutrition (wasting, stunting, and underweight), insufficient vitamins and minerals, overweight, obesity, and the resulting diet-related non communicable diseases are all examples of malnutrition. Malnutrition is prevalent and has a wide range of impacts on physiological function, which is often neglected by professionals. It's linked to higher rates of morbidity and mortality in hospital patients, as well as higher healthcare costs.