Insulin Resistance, Diabetes, and Functional Medicine

Jonathan Vellinga, MD


Insulin resistance, prediabetes, and diabetes rates continue to rise, according to the CDC (1). Around 34% of the population has either diabetes or prediabetes, and up to 70% of overweight and obese people may have some form of insulin resistance (1, 2). Unfortunately, diabetes is the seventh leading cause of death in the United States (3). While these statistics may seem grim, there is good news: with the help of functional medicine, these conditions can be managed and sometimes even reversed!


Insulin Resistance, Diabetes, and Functional Medicine

What is insulin resistance? And how is insulin resistance different from diabetes?


After you eat, a hormone called insulin helps move glucose from your blood into your cells (4, 5). When your body (specifically the muscles, fat, and liver) doesn’t respond as easily to insulin, too much glucose remains in the blood, resulting in what we call high blood sugar. If this happens consistently and your body is unable to keep your blood sugar levels in check, you are considered insulin resistant (4). Normally, your pancreas will increase insulin production, which can keep blood glucose levels within a relatively normal range (4, 5). If insulin resistance worsens and blood sugar levels remain elevated, then this results in prediabetes. Once glucose levels remain consistently elevated and the disease progresses, you can develop type 2 diabetes (4, 5).


Type 2 diabetes is the more common type of diabetes, in which the body does not respond to insulin well (unlike type 1 diabetes, which only means that the body has stopped making insulin). While both types can be related to an inherited genetic predisposition, both are triggered by different environmental factors. Triggers of type 1 are still being studied, but cold climate, viruses, and early diet (not breastfeeding combined with early introduction of solid foods) are thought to be some of the causes (6). Type 2 diabetes has a much stronger tie to lifestyle, family history, and genetics (6).


When pregnant, some otherwise non-diabetic women can develop gestational diabetes. The body uses insulin less effectively during pregnancy due to hormonal changes (8). For some women who already have insulin resistance, these hormonal changes exacerbate the resistance and cause short-term diabetes (8). Gestational diabetes usually doesn’t have any symptoms and may subside after giving birth. However, about 50% of women with gestational diabetes end up developing type 2 diabetes (8).


What are the symptoms of insulin resistance, prediabetes, and diabetes?


Type 1 and type 2 diabetes symptoms vary and can be mild or very severe. Symptoms can include (4, 7):

  • Extreme thirst, hunger, or fatigue

  • Frequent urination

  • Losing weight without trying

  • Delayed healing time

  • Dry, itchy skin

  • Tingling or loss of feeling in feet

  • Blurry eyesight

  • Increased infections

  • Nausea, vomiting, stomach pains (type 1 only)


Unfortunately, insulin resistance, prediabetes, and gestational diabetes often don’t have any symptoms and may remain asymptomatic for many years. Some people with prediabetes experience darkened skin in the armpit or on the back and sides of the neck and may have skin tags in the same area (4). While rarer, prediabetes and diabetes can also cause eye changes that eventually lead to problems with eyesight (4).