Alzheimer’s disease affects 50 million people worldwide and just like any modern lifestyle disease, it is steadily increasing. Unfortunately, a cure has not yet been found, despite decades of research. The pathophysiology of Alzheimer’s disease is extraordinarily complex and involves many different factors. Despite it being a protein misfolding disease, a lot of evidence currently point to insulin resistance, impaired glucose metabolism and comorbidities with other metabolic disorders such as obesity, elevated blood lipids, and non-alcoholic fatty liver disease, as a potential root cause. Genetics aside, it seems like poor metabolic functioning affects the brain and central nervous system a great deal: affecting mood, behaviour, and cognitive performance. Even mood disorders are interlinked with metabolic disorders and increase the risk for Alzheimer’s disease later in life. This is a summary of objectively chosen original research articles, published between 2011-2021 and with insulin resistance as the main objective for cognitive impairment and Alzheimer’s disease.