In the summer of 2015, researchers at the University of Turku in Finland presented findings that insulin resistance may be a contributing factor in language problems among female patients. The specific problem relates to verbal fluency, or the rate in which an individual can produce words. Women with insulin resistance related to diabetes are also likely to present with low verbal fluency, which may be a sign of the declining executive function characteristic of early Alzheimer's disease.
A second study published in the Finnish journal Diabetologia has also found a link between patients with insulin resistance and those with low verbal fluency. Researchers currently hypothesize that the correlation stems from lesions in the white matter of the brain or from blood vessel changes related to insulin resistance. However, University of Turku researcher Dr. Laura Ekblad notes that only an association and not a causation is evident at present. Researchers agree that more investigation is necessary to determine the source of the proposed connection.