PLAY
Hemoglobin is a protein in red blood cells that carries oxygen throughout the body. Glucose binds to hemoglobin in the bloodstream, forming glycosylated hemoglobin, also known as hemoglobin A1c. The hemoglobin A1c test measures average blood glucose over the past 2–3 months. (source)
This glycosylation process is cumulative and irreversible; once glucose binds to hemoglobin, it remains bound for the life of the red blood cell. This makes HbA1c the most reliable window into sustained glucose regulation. When glycation is low and stable, it signals that insulin sensitivity, carbohydrate metabolism, and pancreatic function are operating efficiently. When HbA1c drifts upward, it exposes chronic hyperglycemia that accelerates oxidative stress, vascular damage, and systemic inflammation, all of which directly constrain performance and recovery capacity. (source)
Low hemoglobin A1c levels can stem from physiological factors linked to insulin production and utilization, which are primarily influenced by the pancreas and muscle tissue. From a nutritional standpoint, inadequate carbohydrate intake or prolonged fasting can contribute to decreased HbA1c levels, indicating chronically low circulating glucose. (source, source)
Potential Performance Impact:
Prioritize carbohydrates: Consumption of carbohydrates is associated with higher hemoglobin A1c levels. Carbohydrates are broken down by digestive enzymes into glucose, which enters the bloodstream, triggering glycation of hemoglobin over time. (source, source)
Protocol: Consume at least 3 servings of carbohydrates daily. One serving examples: apple with skin (1 medium), brown rice cooked (1 cup), orange (1 medium), blueberries (1 cup).
Incorporate organic fruit juice: Consumption of glucose is associated with higher hemoglobin A1c levels. Fruit juice contains simple carbohydrates, which are quickly broken down into glucose, increasing circulating blood sugar. (source)
Protocol: Drink 8 oz of organic juice.
Supplement with carbohydrates around training: Consumption of glucose is associated with higher hemoglobin A1c levels. Carbohydrates are broken down by digestive enzymes into glucose, which enters the bloodstream and contributes to hemoglobin glycation. (source)
Protocol: Supplement with 15 to 30 g around the training window.
Elevated hemoglobin A1c levels can be influenced by physiological factors such as insulin resistance and impaired glucose metabolism, which may affect organs like the pancreas and liver. From a nutritional standpoint, excessive intake of refined carbohydrates and sugars can contribute to sustained hyperglycemia and chronic glycation. (source, source)
Potential Performance Impact:
Limit simple carbohydrates: Consumption of carbohydrates has been associated with higher hemoglobin A1c levels. Simple carbohydrates are quickly broken down into glucose, which then enters the bloodstream, triggering higher rates of hemoglobin glycation. (source, source)
Protocol: Limit consumption of refined foods, like pasta, white bread, and sugar.
Incorporate cinnamon: Consumption of cinnamon has been shown to elicit positive effects on blood glucose levels. Cinnamon upregulates cellular glucose absorption and activates insulin signaling pathways, enhancing GLUT4 translocation. (source)
Protocol: Consume up to 1 tsp of cinnamon daily.
Train regularly: Aerobic and resistance training have been shown to reduce hemoglobin A1c. Exercise helps to reduce hemoglobin A1c through multiple mechanisms. Muscle enhances cellular glucose uptake through GLUT4 translocation, reducing the amount of glucose available to bind with hemoglobin. (source)
Protocol: Perform at least 3 exercise sessions per week, combining aerobic and resistance training.
Avoid prolonged sitting: Walking has been shown to positively affect blood glucose levels. Exercise helps to reduce hemoglobin A1c through multiple mechanisms. Muscle enhances cellular glucose uptake through GLUT4 translocation. Interrupting prolonged sitting with brief movement bouts reduces postprandial glucose. (source)
Protocol: Break up each hour of sitting with at least five minutes of physical activity, such as body weight squats, knee raises, walking, and push-ups. Do a daily structured walk of at least one mile.
Supplement with berberine: Berberine supplementation has been shown to decrease hemoglobin A1c levels. Berberine supports healthy hemoglobin A1c levels through a variety of mechanisms including AMPK activation, enhanced GLUT4 translocation, and improved insulin signaling. (source, source)
Protocol: Supplement with at least 1 g of berberine daily.
