Recent research has shown that the amino acid glutamine can positively affect gut health by supporting the gut microbiome, gut mucosal wall integrity, and by modulating inflammatory responses. As modulated by the vagus nerve, via the enteric nervous system, the gut-brain connection can impact the brain's neurochemical environment. Poor gut health can disrupt the balance of neurotransmitters, which can result in neuropsychiatric based conditions such as depression. Glutamine supplementation may provide significant adjunctive nutritional support in cases of depression by promoting proper gut health and function.

Nutritional supplementation has long been studied as a possible treatment alternative or as an adjunct to the standard treatments for common ailments and diseases. According to the latest research, the Chilean maqui berry, Aristotelia chilensis, has been shown to reduce postprandial insulin levels by as much as fifty percent. The berry, which has been shown to be as effective as metformin at increasing insulin sensitivity and controlling blood glucose levels, follows a simple mechanism of action that involves the inhibition of sodium dependent glucose transporters in the small intestine, slowing the rate at which sugars enter the bloodstream and thereby decreasing blood sugar spikes and the corresponding increase in insulin levels. Chronically high blood glucose levels have been proven to play a significant role in the development of cancers, as diabetics and prediabetics have been proven to have elevated risk of developing cancerous growth. Consistent dietary supplementation with maqui berry may therefore indirectly reduce the risk of cancer, as well as other diseases which respond negatively to hyperglycemia and hyperinsulinemia.

Genetic screening in the primary care setting is the future of preventative medicine. Genetic testing is an important medical tool for assessing various inheritable diseases, conditions, and cancers. The ability to diagnose patients before symptoms surface can help lessen the severity of symptoms and promote quality of life. However, genetic screening can cause psychological distress from the knowledge of test results, in some cases only serving to increase the risk of developing a condition due to stress. Genetic testing can be conducted anytime in life, even before birth. In this review, a compilation of genetic testing's definitions and boundaries, factors influencing an individual's test outcomes, and an overview of a wide variety of diseases, conditions and cancers were collected.