Diabetes management: Doctor shares top 5 lifestyle strategies to lower HbA1c levels

The key marker of long-term blood sugar control is lowering HbA1c. It is one of the most effective steps a person with prediabetes or type-2 diabetes can take to protect their long-term health. While medications play an important role, a growing body of research shows that targeted lifestyle changes can produce reductions in HbA1c.
Recently, renowned neurologist Dr. Sudhir Kumar has highlighted five of the most evidence-backed lifestyle strategies that consistently help lower HbA1c. Each method is supported by strong scientific data and offers measurable improvements, even when adopted gradually. Here we explore those five lifestyle habits.
Below are top 5 science-backed methods to lower HbA1C levels

According to Dr. Sudhir, this is the most powerful lifestyle intervention, and it is expected to drop 0.5 to 1.0% of HbA1c levels.
​Scientific evidence suggests dose-response analyses show that weight loss in overweight or obese people with type-2 diabetes is consistently accompanied by HbA₁c reductions, and larger weight loss results in larger HbA₁c fall.

Doctor Sudhir Kumar recommends 150 minutes of aerobic exercise per week, along with 2 to 3 strength sessions. The expected drop in HbA1c levels from this practice is 0.6 to 0.9%.
A landmark review, published in JAMA Network, analysed 47 randomized controlled trials of 8538 participants, comparing structured exercise, like aerobic, resistance, or combined, with no structured exercise or usual care. Structured exercise was associated with a mean HbA₁c reduction of −0.67%.

Reducing refined carbs, and adding fiber, nuts, and fish can lead to a drop of around 0.3 to 1.0% in HbA1c levels, as per Doctor Sudhir.
Both low-carbohydrate diets and the Mediterranean diet have strong clinical evidence. These dietary approaches share core features: controlled carbohydrate intake, higher fibre, healthy fats, and reduced refined carbs.
A study titled “the effects of low-carbohydrate diet on glucose and lipid metabolism in overweight or obese patients with T2DM” found that in overweight/obese T2DM patients, low-carb diets significantly improved HbA1c: mean difference of around 0.36% vs control.

Doctor Sudhir recommends following a 10 to 12 hour eating window, and strictly avoiding late dinners. This can provide a drop of 0.3 to 0.6% in HbA1c levels.
​Scientific evidence supports time-restricted eating as a promising optional strategy for people with type-2 diabetes or impaired glucose regulation, especially if done consistently and combined with other healthy lifestyle habits. However, some studies show that a 0.3 to 0.6% HbA1c reduction is within observed ranges in some trials, the average effect is smaller, and not everyone will benefit equally.

NEAT is a scientific term for the energy one burns during daily activities that are not formal exercise. In simpler words, it’s all the calories one uses just by moving around in everyday life, outside of the gym workouts or planned exercise sessions.
Dr. Sudhir Kumar recommends activities like more walking throughout the day, climbing more stairs and a post-meal 10-min walk can lower 0.2 to 0.4% of HbA1c levels.
Not many studies are done on the particular NEAT method, however, there are studies that use walking or light‐to‐moderate physical activity to assess impact on blood sugar control. In a Randomized trial, where the participants with type‑2 diabetes were assigned to interval‑walking showed improved glycemic control.

These 5 lifestyle interventions can have a synergistic effect on blood sugar control. Individually, each adaptation can produce modest improvements.
According to Doctor Sudhir Kumar, the total achievable HbA1c reduction with these combined lifestyle changes is 1–2%, he adds this is similar to starting a diabetes medication. This underscores the importance of an integrated lifestyle approach for managing type 2 diabetes effectively.