Which definition accurately describes "malnutrition"?

Malnutrition is accurately described as a condition that results from an unbalanced diet or insufficient intake of nutrients. This definition encompasses a wide range of dietary deficiencies, including those due to inadequate caloric intake, lack of certain vitamins or minerals, or an overall poor diet that does not meet the body's nutritional needs.

Malnutrition can manifest in various forms, including undernutrition, where individuals do not get enough calories or essential nutrients, as well as overnutrition, which can involve an excess intake of certain nutrients or calories leading to health issues like obesity. While other options touch on different aspects of nutrition, they do not encompass the broader definition of malnutrition as seen in option A.