For years, Hemoglobin A1c has been considered a primary benchmark for measuring type 2 diabetes control. While it remains an important tool, there’s a growing shift in diabetes care toward focusing on overall metabolic health and the role excess weight plays in driving the disease.
We asked endocrinologist Dr. Lucy Esteve to explain why experts are rethinking traditional approaches and how targeting weight loss of 15% or more may improve outcomes for people living with type 2 diabetes.
Why is there a shift away from focusing solely on A1c?
While A1c measures long-term blood sugar levels (over 3 months), it primarily reflects the symptoms of type 2 diabetes, not the underlying cause. In simple terms, A1c doesn’t explain why blood sugar levels are high.
For most patients, type 2 diabetes is driven by insulin resistance linked to excess weight, not a lack of insulin. That’s why there is increasing emphasis on sustainable weight loss (around 15% or more) as a primary treatment goal.
Clinical research continues to support this shift, showing that meaningful weight loss can improve metabolic function and, in some cases, even lead to type 2 diabetes remission.
What are the limitations of focusing only on A1c?
A1c provides an average of blood glucose levels over time, but it doesn’t tell the full story of daily glucose variability.
In addition:
- A1c may be less reliable in certain populations, including Black, Hispanic, Asian, and Mediterranean individuals
- It can be affected by conditions impacting red blood cell lifespan or hemoglobin
Patients can be treated with insulin and achieve target A1c levels but still face increased risk of obesity-related complications including:
- Cardiovascular disease
- Fatty liver disease
- Kidney disease
“By targeting weight loss in T2D management, one can achieve glycemic control and prevent cardiometabolic complications,” Dr. Esteve explains.
What is the connection between visceral fat, inflammation, and insulin resistance?
Visceral fat, or fat stored deep in the abdominal cavity, plays a major role in chronic inflammation and metabolic dysfunction.
This fat releases inflammatory cytokines that trigger immune responses throughout the body, leading to inflammation in:
- Liver
- Skeletal muscle
- Pancreas
- Gut
- Brain
Over time, this inflammation disrupts insulin signaling, resulting in insulin resistance, the hallmark of type 2 diabetes.
How does reducing fat in the liver and pancreas improve diabetes?
Excess fat in the liver and pancreas creates metabolic stress that interferes with normal glucose regulation.
By reducing this fat, the body can begin to recover:
- Liver function improves
- Insulin sensitivity increases
- Pancreatic beta cells regain the ability to produce insulin more effectively
This is a key reason why weight loss is central to type 2 diabetes treatment and potential reversal.
How do GLP-1 medications support both weight loss and blood sugar control?
GLP-1 receptor agonists have revolutionized type 2 diabetes treatment by targeting both glucose control and weight loss.
These medications:
- Slow gastric emptying
- Reduce appetite
- Promote satiety
As a result, patients often achieve 20–30% weight loss over 6-12 months, significantly improving insulin resistance and blood sugar levels.
“Patients on GLP-1’s are often able to discontinue other type 2 diabetes medications and simplify their medical regimen,” Dr. Esteve explains.
GLP-1 therapies are generally appropriate for patients with type 2 diabetes who are overweight or obese, with no history of pancreatitis.
Is there a psychological benefit to focusing on weight instead of glucose numbers?
For many patients, focusing on a clear, tangible goal like weight loss can feel more achievable than tracking fluctuating glucose readings.
Monitoring weight is simple and non-invasive, while glucose monitoring can feel more burdensome and invasive using fingerstick glucose readings or continuous glucose monitors.
A root cause approach to type 2 diabetes
A1c remains an important part of diabetes management, but addressing the root causes of type 2 diabetes, particularly insulin resistance driven by excess weight, can lead to long-term improvements in health.
Consult with an Endocrinologist in Austin, TX
If you’re looking for a more personalized approach to managing type 2 diabetes, our team at Texas Diabetes & Endocrinology is here to help. Call (512) 458-8400 or request an appointment online to get started. Don’t forget to follow us on Facebook and Instagram and check back with us each month as we provide you helpful wellness and health information.
