The Glucose Problem After Concussion The concussed brain cannot use glucose efficiently for several weeks after injury. The neurometabolic cascade reduces mitochondrial function and disrupts the cellular machinery that converts glucose to ATP. This produces a state called glucose hypometabolism, where the brain has plenty of glucose available but cannot process it effectively. The energy crisis that drives PCS symptoms is partly a glucose utilization problem (Giza & Hovda, 2014). Ketones provide an alternative fuel that bypasses the broken machinery. When the body runs on ketones instead of glucose, the brain can use ketones directly for energy. The metabolic pathway for ketone utilization is different from glucose and remains functional after concussion. This is why ketogenic diets show benefit in traumatic brain injury research: they provide working fuel when glucose metabolism is impaired. Ketones reduce neuroinflammation. Beta-hydroxybutyrate (the primary ketone) directly suppresses the NLRP3 inflammasome, a major driver of neuroinflammation after brain injury. Animal studies show that ketogenic diets begun within 24 hours of TBI reduce neurological deficits and improve recovery. Human research is earlier but trending in the same direction. What the Research Shows Animal research is strong; human research is early. Multiple animal studies demonstrate that ketogenic diets reduce brain injury severity, decrease edema, lower inflammation markers, and improve cognitive outcomes after TBI. Human research has shown ketone supplementation (exogenous ketones) reduces symptoms in athletes with concussion. Full ketogenic diet studies in humans are limited but ongoing. The mechanisms are well-established even where human outcome data is limited. Ketones increase mitochondrial efficiency, reduce oxidative stress, suppress inflammation, and support BDNF production. Each of these mechanisms addresses a specific aspect of the concussion injury cascade. The mechanistic case for ketogenic diets in concussion recovery is strong. Most patients benefit from a moderate low-carb approach. Strict ketogenic diets (under 20g carbs daily) are clinically intensive and difficult to maintain. A moderate low-carb diet (50-100g carbs daily) produces some ketone elevation and reduces the glucose-related symptom triggers without the difficulty of full keto. Most patients see clinical improvement at this moderate level. Implementing a Low-Carb Approach Reduce carbs to 50-100g daily for moderate effect. This means eliminating bread, pasta, rice, potatoes, sugar, and most processed foods. Eat vegetables (low-starch varieties), proteins (eggs, fish, meat), healthy fats (olive oil, avocado, nuts), and small amounts of berries. The reduced carb intake produces mild ketosis without strict tracking. Go strict keto (under 30g carbs daily) for maximum effect. Strict keto produces higher ketone levels and stronger therapeutic effect but requires careful planning. Track macros, supplement electrolytes (sodium, potassium, magnesium), and expect 1-2 weeks of adaptation. The benefit-to-difficulty ratio favors moderate low-carb for most patients. Add MCT oil for accelerated ketone production. Medium-chain triglyceride (MCT) oil converts to ketones rapidly regardless of total dietary carb intake. Start with 1 teaspoon daily and increase to 1-2 tablespoons daily. MCT oil allows you to produce ketones with a less strict diet, making the approach more sustainable. Mobility Support During Dietary Transition JME 155 Diaphragmatic breathing supports the autonomic regulation that dietary changes initially disrupt. The first 1-2 weeks of low-carb transition produces autonomic stress as the body adapts. Regular breathing sessions reduce this transition stress and support the metabolic shift. 10 breaths, 4 times daily during the dietary transition period. JME 14 Chin tucks during the dietary adaptation phase address the cervical contribution to symptoms while metabolic changes proceed. The dietary intervention works at the metabolic level. Cervical work continues addressing the mechanical contribution to PCS symptoms. The combined approach produces better outcomes than either alone. 10 repetitions with 5-second holds, 4-5 times daily. JME 1 Cervical rotation maintains the vestibular and proprioceptive calibration that supports the body's adaptation to metabolic changes. Reduced glucose intake initially produces some lightheadedness in sensitive individuals. Maintaining proprioceptive accuracy through cervical rotation reduces this adaptation symptom. 10 repetitions each direction, daily. JME 150 Thoracic rotation supports the digestive function changes that accompany dietary transition. The shift from carb-based to fat-based metabolism initially affects digestion. Thoracic mobility supports diaphragmatic motion and the gentle abdominal pressure changes that aid digestion. 8 repetitions per direction, daily. Start your 3-day free trial for metabolic-support mobility programming. What to Eat on a Concussion Recovery Diet Primary foods: Fatty fish 2-3 times weekly (salmon, sardines, mackerel for omega-3) Eggs daily (choline supports brain function) Grass-fed beef and lamb (B-vitamins, creatine, zinc) Avocado daily (monounsaturated fat, magnesium) Leafy greens at every meal (folate, magnesium, antioxidants) Nuts and seeds (vitamin E, magnesium, omega-3 ALA) Berries (1/2 cup daily for antioxidants without excess sugar) Olive oil (anti-inflammatory monounsaturated fat) MCT oil (ketone production) Foods to eliminate: Sugar in all forms (cane sugar, agave, honey, fruit juice) Refined grains (bread, pasta, crackers, cereals) Industrial seed oils (soybean, corn, canola, sunflower) Alcohol (delays recovery directly) Processed foods generally Foods to limit (50-100g carb approach): Starchy vegetables (potatoes, sweet potatoes, squash) - small portions Whole grains (oats, quinoa, brown rice) - small portions if tolerated Whole fruit (1-2 pieces daily, prefer berries) Dairy (some people tolerate, others develop inflammation) Daily Movement Support JME 3 Lateral cervical flexion supports continued mechanical recovery while metabolic recovery proceeds. The dietary intervention addresses brain metabolism. The cervical work addresses the neck-related contribution to PCS symptoms. Both progress simultaneously for fastest total recovery. 8 repetitions per side with 15-second holds, daily. JME 42 Shoulder circles maintain upper-body mobility through the dietary transition. Some patients experience temporary fatigue during the first 1-2 weeks of low-carb adaptation. Continuing gentle shoulder mobility prevents the stiffness that accumulates during low-energy periods. 10 repetitions each direction, daily. JME 15 Cervical extension daily maintains the cervical mobility needed to handle returning activity levels as the metabolic intervention takes effect. As ketone-fueled brain function improves, activity tolerance increases. Maintained cervical mobility supports the return to higher activity without cervical limitation. 8 repetitions daily. JME 151 Lateral side bends with breathing combine trunk mobility with the breathing pattern that supports autonomic balance. The combination addresses two systems simultaneously, making this the most time-efficient daily exercise during dietary transition. 8 repetitions per side, daily. Combine metabolic and mobility recovery with simplmobility's concussion programming. Who Should Avoid Ketogenic Approaches Pregnant or breastfeeding women. Ketogenic diets during pregnancy and breastfeeding have inadequate safety data. Use a moderately reduced-carb whole-foods approach instead, with adequate prenatal nutrition. Type 1 diabetics. Ketogenic diets in type 1 diabetes require careful medical supervision due to the risk of diabetic ketoacidosis. Do not begin without your endocrinologist's involvement. People with eating disorder history. The restrictive nature of ketogenic diets reinforces eating disorder patterns. Use a moderate low-carb approach focused on food quality rather than strict tracking. Anyone unable to maintain it. The benefit comes from sustained ketone elevation. Going on and off keto repeatedly produces stress without therapeutic benefit. If you cannot maintain the approach for 4-8 weeks, a moderate low-carb approach is better than failed strict keto. How long should I stay on a low-carb diet? Minimum 4-6 weeks during active recovery. Many patients continue indefinitely because the cognitive clarity and stable energy continue benefiting daily function. There is no medical reason to return to higher carb intake if the lower-carb approach feels good and is sustainable. Will I feel worse during the first week? Possibly. The "keto flu" (fatigue, headache, brain fog during initial adaptation) lasts 3-7 days for most people. Adequate electrolytes (especially sodium) reduce these symptoms substantially. Add 1-2 teaspoons of salt daily during the transition. After the first week, energy typically improves above baseline. Should I take exogenous ketones instead of changing my diet? Exogenous ketone supplements provide some benefit but produce shorter-lived ketone elevation than dietary ketosis. They are useful as an adjunct or for patients who cannot maintain dietary change. The combination of moderate low-carb diet plus exogenous ketones during high-symptom periods provides flexible support. References Giza, C. C., & Hovda, D. A. (2014). The new neurometabolic cascade of concussion. Neurosurgery, 75(Suppl 4), S24-S33. PubMed Prins, M. L., & Matsumoto, J. H. (2014). The collective therapeutic potential of cerebral ketone metabolism in traumatic brain injury. Journal of Lipid Research, 55(12), 2450-2457. PubMed