How Peter Lowered His A1c to 5.8 Without Insulin in Just 8 Weeks

Article written and reviewed by Robby Barbaro, MPH
Published April 8, 2026

Meet Peter. His blood sugar had been steadily rising, and he knew where his health was heading, moving beyond the prediabetic range and approaching full type 2 diabetes. His doctor made it clear. If things continued in that direction, insulin would likely be the next step. That was something Peter wanted to avoid.

At the same time, he was struggling with weight gain and low energy. He often felt sluggish after meals, heavy, and tired throughout the day. Even though he tried to improve his diet, nothing seemed to make a meaningful impact on his blood glucose, A1c, or weight.

He knew something needed to change.

A Warning That Prompted Action

Peter’s A1c had climbed to 6.8, placing him firmly in the diabetic range. His fasting blood glucose was around 140, and the trajectory was heading upward. His doctor’s warning about insulin was a turning point.

He did not want to rely on medication long term, and he wanted to find a way to improve his health naturally. While he had tried adjusting his diet before, those efforts did not produce lasting results.

Around this time, he was introduced to Mastering Diabetes through a nutritionist. He began reading the book, learning about the approach, and considering whether he was ready to commit.

At first, he hesitated, but after discussing it with his wife and speaking directly with the team, he decided to move forward.

Discovering a New Way to Approach Blood Sugar

Once Peter joined the program, he began working through the educational modules and learning how insulin resistance plays a central role in blood sugar regulation.

The approach was different from anything he had tried before.

Instead of restricting carbohydrates, the focus was on improving insulin sensitivity through a low-fat, whole-food, plant-based diet. Meals were built around fruits, legumes, grains, and vegetables, emphasizing fiber-rich foods that support metabolic function.

At first, he simply followed the plan and paid attention to how his body responded. The changes came quickly.

Seeing Results That Confirmed It Was Working

Within weeks, Peter began to notice how different he felt.

He no longer experienced the heaviness after meals. His energy improved, and he felt lighter throughout the day. That alone was encouraging.

But what truly confirmed that the program was working were the numbers.

After about eight weeks, his A1c dropped from 6.8 to 5.8. His fasting blood glucose, which had been around 140, fell to 82.

For Peter, that was the moment everything became real.

Peter’s Before and After Results

The improvements Peter experienced in just 8 weeks were both measurable and meaningful.

Header

Before

After

A1c (%)

6.8

5.8

Fasting Blood Glucose (mg/dL)

140

82

Weight (lbs)

215

205

Metformin

500mg 3x p/day

500mg 1x p/day

In just over two months, he significantly reduced his A1c, brought his fasting glucose into a healthy range, lost weight, and reduced his medication by two-thirds.

These changes gave him confidence that he was moving in the right direction.

Feeling Better on a Daily Basis

Beyond the lab results, Peter noticed improvements in how he felt every day.

Previously, meals often left him feeling sluggish and heavy. Now, he feels lighter and more energized after eating. The foods he consumes provide sustained energy rather than a temporary boost followed by fatigue.

This shift in how he feels has made it easier to stay consistent with the program. He is not forcing himself to follow the plan. He enjoys it.

Simple, Satisfying Meals That Work

Peter’s daily meals are built around simple, whole foods that are easy to prepare and satisfying.

For breakfast, he often has a smoothie made with beans, cacao powder, dates, flax, and water. It is filling, energizing, and something he looks forward to each morning.

Lunch typically includes a large salad topped with baked potatoes, brown rice, corn, beans, and salsa. Dinner is often a lighter meal, such as a simple soup with rice, beans, and vegetables.

These meals are not complicated, but they are effective. They provide the nutrients his body needs while supporting improved insulin sensitivity.

The Role of Accountability and Support

Peter found that accountability played an important role in his success.

Meeting with his coach weekly gave him structure and encouragement. It helped him stay committed, especially during the early stages of the transition.

He also benefited from the educational resources within the program. The modules, recipes, and community support provided guidance and reassurance that he was on the right path.

For Peter, this combination of structure and support made the process easier to sustain.

Building a Sustainable Lifestyle

One of Peter’s primary goals was not just to improve his numbers temporarily, but to create a lifestyle he could maintain long term. He believes he has found that.

The foods are affordable, accessible, and enjoyable. The structure is simple enough to follow consistently. And the results reinforce his motivation to continue.

He plans to stay on the program, refine his habits, and continue improving his health over time.

Looking Ahead with Confidence

Peter now feels optimistic about his future.

Instead of worrying about progressing to insulin dependency, he sees a clear path forward. His A1c is moving in the right direction. His weight is decreasing. His energy is improving.

He believes that by staying consistent, he can continue lowering his A1c and reach his long-term health goals. For the first time in a long time, he feels in control.

What Peter Wants Others to Know

Peter understands what it feels like to hesitate before making a change. He was in that position himself.

But based on his experience, he encourages others to give the program a chance. He believes that the approach is safe, effective, and capable of producing real results when followed consistently.

He also emphasizes an important mindset shift. It is not about perfection. It is about direction. Staying committed, even after a difficult day or week, is what leads to long-term success.

Ready to See Results Like Peter?

If your blood sugar is rising, your A1c is trending upward, or you have been told that medication may be your next step, Peter’s story shows that change is possible.

Book a free discovery call with one of our advisors and learn how to begin your own transformation.

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About the author 

Robby Barbaro, MPH

Robby Barbaro, MPH is a New York Times bestselling co-author of Mastering Diabetes: The Revolutionary Method to Reverse Insulin Resistance Permanently in Type 1, Type 1.5, Type 2, Prediabetes, and Gestational Diabetes.

Robby was diagnosed with type 1 diabetes at the age of 12 and has been living this lifestyle since 2006. In that time, while eating pounds of fruit every day, his HbA1c has been stable with a current A1c of 5.3%, TIR of 92%, and average total daily insulin use of 30 units.

Robby graduated from the University of Florida and is the cofounder of Mastering Diabetes and Amla Green. He worked at Forks Over Knives for six years before turning his attention in 2016 to coaching people with diabetes full time.

He is the co-host of the annual Mastering Diabetes Online Summit, a featured speaker at VegFest LA, and has been featured on The Doctors, Forks Over Knives, Vice, Thrive Magazine, Diet Fiction, and the wildly popular podcasts the Rich Roll Podcast, Plant Proof, MindBodyGreen, and Nutrition Rounds.

Robby enjoys exercising every day, spending time with friends, and sharing his lifestyle on Facebook, Twitter and Instagram.