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Insulin is a hormone secreted by the pancreas that regulates blood glucose levels. It helps glucose enter muscle, fat, and liver cells, where it can be used for energy. Insulin also plays a role in fat metabolism, protein synthesis, and overall metabolic regulation. (source, source)
When insulin signaling is intact, cells receive glucose efficiently, anabolic pathways remain active, and the body maintains metabolic flexibility, the ability to shift between carbohydrate and fat oxidation based on demand. When insulin regulation breaks down, every downstream system is compromised: energy availability falters, fat accumulation accelerates, inflammation rises, and recovery capacity is diminished. Insulin is not merely a glucose-management hormone; it is the central metabolic coordinator. (source)
Low insulin levels can stem from physiological factors affecting the pancreas, the organ responsible for insulin production. Nutritional factors may include a diet high in refined carbohydrates and sugars that can lead to pancreatic fatigue over time. Inadequate carbohydrate intake is a primary driver; the pancreas releases insulin in response to rising blood glucose, and without sufficient substrate, secretion drops. (source, source)
Potential Performance Impact:
Prioritize carbohydrates: Carbohydrate consumption increases insulin. Carbohydrates are broken down by digestive enzymes into glucose, which enters the bloodstream, triggering release of insulin by the pancreas. (source, source)
Protocol: Consume at least 3 servings of carbohydrates daily. One serving examples: apple with skin (1 medium), brown rice cooked (1 cup), white rice cooked (½ cup), orange (1 medium), blueberries (1 cup).
Incorporate organic fruit juice: Carbohydrate consumption increases insulin. Fruit juice contains simple carbohydrates, which are quickly broken down into glucose, triggering rapid insulin release. (source, source)
Protocol: Drink 8 oz of organic juice.
Avoid alcohol: Alcohol consumption has been shown to reduce insulin levels. (source, source) Alcohol can lower insulin by damaging β-cells, impairing their signaling, sequestering insulin in the pancreas, increasing insulin clearance, or improving insulin sensitivity. (source, source)
Protocol: Monitor alcohol intake. Try to limit consumption to one or two drinks daily, with the goal of less than three per week.
Supplement with carbohydrates around training: Carbohydrate consumption increases insulin. Carbohydrates are broken down by digestive enzymes into glucose, which then enters the bloodstream, triggering the release of insulin by the pancreas. (source)
Protocol: Supplement with 15 to 30 g around the training window.
High insulin levels can stem from physiological factors related to insulin resistance, particularly in tissues like muscle and adipose tissue, where insulin plays a role in glucose uptake and metabolism. Nutritionally, excessive intake of refined carbohydrates and sugars can contribute to elevated insulin levels by constantly stimulating insulin production. (source, source)
Potential Performance Impact:
Limit simple carbohydrates: Simple carbohydrate consumption increases insulin. Simple carbohydrates are quickly broken down into glucose, which then enters the bloodstream, triggering the release of insulin by the pancreas. Reducing simple carbohydrates lowers the insulin demand. (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, which positively affect insulin levels. Cinnamon upregulates cellular glucose absorption and activates insulin signaling pathways. (source)
Protocol: Consume up to 1 tsp of cinnamon daily.
Train regularly: Physical activity has been shown to reduce insulin levels, with greater effects at higher intensities. Exercise helps to reduce insulin levels through multiple mechanisms. Muscle enhances cellular glucose uptake through GLUT4 translocation, reducing the amount of insulin needed to manage blood glucose. (source, 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 insulin levels through multiple mechanisms. Muscle enhances cellular glucose uptake through GLUT4 translocation, reducing the insulin demand. (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.
Prioritize sleep: Insufficient sleep is associated with dysregulated insulin. By disrupting the body's circadian rhythm, poor sleep can increase cortisol production negatively affecting insulin sensitivity and promoting insulin resistance. (source)
Protocol: Get 7 to 9 hours of quality sleep nightly.
Supplement with berberine: Berberine has been shown to decrease insulin concentrations. Berberine supports healthy insulin levels through a variety of mechanisms. Berberine increases the activity of insulin beta cells, supports the proliferation of insulin beta cells, and increases the expression of the insulin receptor. (source)
Protocol: Supplement with at least 1 g of berberine daily.
