Prediabetes. Lately it seems like many of my patients have been diagnosed with this condition. After receiving this diagnosis from their health provider, usually accompanied by some scary warnings about eventually developing diabetes and often with a side of weight shaming, these patients end up in my office feeling freaked out and worrying about the (seemingly) rapid decline in their health. A number of these patients have been advised by their doctor to start medications such as Metformin or GLP-1s to help manage their blood sugar. And more than I care to count have been advised to cut out carbohydrates and lose weight. While I do think that having information about one’s blood sugar and looking out for changes are important, I also believe that some members of the medical community are creating panic around this condition while simultaneously pushing medications and diets that are unwarranted.
What is prediabetes? Well, it’s a relatively new diagnosis that was first introduced in the late 1970s to describe patients whose blood sugar levels are higher than “normal” but not yet high enough to be in the range for type 2 diabetes. There are currently four different blood tests that can be used to diagnose someone with prediabetes (and diabetes): random blood sugar test, fasting plasma glucose (FPG) test, oral glucose tolerance test (OGTT), and hemoglobin A1C (A1C) test, but the majority of patients receive their prediabetes diagnosis following the A1C test. The A1C test measures average blood sugar levels over the previous two to three months. A level under 5.7% is considered “normal,” a level between 5.7% and 6.4% is considered “prediabetes” range, and over 6.5% results in a diagnosis of type 2 diabetes. Originally, the range for prediabetes was an A1C between 6.0% and 6.4%, but after extensive lobbying by the pharmaceutical establishment, the range was lowered to 5.7%-6.4% in 2010 by the American Diabetes Association (ADA), resulting in 72 million new cases in the USA. As a result of lowering the threshold for prediabetes, about one in three people in the USA is prediabetic.
So what does the research say about prediabetes and risk of developing diabetes? According to a 2018 comprehensive review of 103 studies, most people in the prediabetes range do not progress to diabetes over any period studied, with 59% of the prediabetes patients studied returning to normal blood sugar within one to eleven years without any treatment. In a 2019 article for Science.org, Charles Piller reports that the Center for Disease Control’s data show that less than 2% of prediabetics go on to develop diabetes per year. But despite this, the medical community continues to put forth the message that a diagnosis of prediabetes is basically a guarantee that diabetes will ensue. And what do these medical professionals recommend to their patients to “reverse” their prediabetes? Weight loss, primarily by way of cutting carbohydrates.
As we know, dietary and exercise interventions for weight loss are unsuccessful for the majority of people, with 90-95% of dieting individuals regaining the weight within five years. In addition to this, weight cycling, or losing and gaining weight over and over again, can result in a number of negative health outcomes such as cardiovascular disease and (you guessed it) diabetes. Telling a patient to try to lose weight to reverse their prediabetes is honestly just lazy doctoring. There are plenty of things people can try to improve their blood sugar levels that have nothing to do with weight loss. Some of these include: making sure to pair carbohydrates with protein, fat, and/or fiber at meals and snacks to help slow down the digestion of carbohydrates, resulting in steadier blood sugar; consistently getting seven to nine hours per night of sleep (as poor sleep quality has been associated with an increase in insulin resistance); engaging in moderate cardiovascular movement (such as walking) which immediately lowers blood glucose, an effect that can last up to 24 hours. But most importantly, if you are diagnosed with prediabetes, please do not panic. While it makes sense to get your A1C tested regularly to look for changes, having A1Cs in the prediabetes range does not mean that you are destined for diabetes.