Diagnostic utility of weight and body mass index is widely overestimated, and their use as health and wellness measures can be sources of iatrogenic harm.
While useful in analyzing population trends in relative body weight, BMI possesses multiple shortcomings when used as an individualized health screening tool.
Critical skills required to weigh decisions with serious consequences, manipulate information rationally, and choose wisely are skills that are likely to be impaired by frontal lobe injury that results in personality change.