The Healthspan Map · Neurological & Mental Health
Peripheral neuropathy
Named for Peripheral neuropathy
| Nutrient or lever | Direction | Strength | Evidence type | What was found | Source |
|---|---|---|---|---|---|
| Alcohol — cut back | Do this | Strong | Established clinical | Chronic alcohol use is a major direct cause of peripheral neuropathy (toxic plus thiamine depletion). | Nutritional & toxic neuropathy (opens in a new tab) |
| Vitamin B12 | Eat enough of | Strong | RCT / meta-analysis | B12 deficiency causes nerve degeneration; supplementation reduces neuropathic symptoms and pain in diabetic neuropathy. | B12 & diabetic neuropathy meta (opens in a new tab) |
| Added Sugars | Don't overdo | Moderate | RCT / meta-analysis | Added sugars drive the blood-glucose spikes that damage peripheral nerves. | Glucose & nerve damage (opens in a new tab) |
| BMI | Watch this | Moderate | Review / narrative | Obesity and metabolic syndrome cause peripheral neuropathy even without diabetes, via insulin resistance and inflammation. | Diabetic neuropathy review (opens in a new tab) |
| Body Roundness Index | Watch this | Moderate | Review / narrative | Body-shape indices capturing central adiposity flag metabolic neuropathy risk. | Diabetic neuropathy review (opens in a new tab) |
| Cardio (moderate + intervals) | Do this | Moderate | RCT / trial | Aerobic plus resistance training improved sensory and motor nerve conduction velocity and symptoms in diabetic neuropathy. | Exercise & nerve conduction (opens in a new tab) |
| Copper | Eat enough of | Moderate | Review / narrative | Copper deficiency causes a myeloneuropathy with sensory ataxia and peripheral nerve involvement, reversible with repletion. | Copper-deficiency myeloneuropathy (opens in a new tab) |
| Daily movement baseline | Do this | Moderate | Review / narrative | Physical inactivity worsens neuropathy; regular activity supports glycemic control and nerve blood flow. | Diabetic neuropathy review (opens in a new tab) |
| Strength (resistance) | Do this | Moderate | RCT / trial | Resistance training (with aerobic) improved nerve function and glycemic control in diabetic neuropathy. | Exercise & nerve conduction (opens in a new tab) |
| Sugary drinks & snacks — cut back | Do this | Moderate | RCT / meta-analysis | Blood-sugar spikes from sugary drinks and snacks interfere with nerve signalling and drive nerve damage. | Glucose & nerve damage (opens in a new tab) |
| Thiamin (B1) | Eat enough of | Moderate | Review / narrative | Thiamine deficiency causes beriberi neuropathy and drives alcoholic neuropathy. | Nutritional & toxic neuropathy (opens in a new tab) |
| Tobacco / vaping — quit | Do this | Moderate | Review / narrative | Smoking worsens the microvascular damage and oxidative stress that injure peripheral nerves. | Diabetic neuropathy review (opens in a new tab) |
| Total Sugars | Don't overdo | Moderate | RCT / meta-analysis | A high total-sugar, high-glycemic load drives the hyperglycemia behind the commonest (diabetic) neuropathy. | Glucose & nerve damage (opens in a new tab) |
| Ultra-processed food — cut back | Do this | Moderate | RCT / meta-analysis | Whole-food eating supports glycemic control - the master lever for the commonest (diabetic) neuropathy. | Glucose & nerve damage (opens in a new tab) |
| Vitamin B6 | Eat enough of | Moderate | Systematic review | B6 deficiency causes a sensorimotor peripheral neuropathy. | Vitamin B6 & neuropathy (opens in a new tab) |
| Vitamin B6 | Don't overdo | Moderate | Systematic review | Excess B6 (megadose supplements, >=200 mg/day) causes a sensory peripheral neuropathy; keep supplements low. | Vitamin B6 toxicity & neuropathy (opens in a new tab) |
| Vitamin E | Eat enough of | Moderate | Review / narrative | Vitamin E deficiency causes a sensory peripheral neuropathy and ataxia. | Nutritional & toxic neuropathy (opens in a new tab) |
| Waist-to-height ratio | Watch this | Moderate | Review / narrative | Central adiposity promotes insulin resistance and metabolic dysfunction that damage peripheral nerves. | Diabetic neuropathy review (opens in a new tab) |
| Waist-to-hip ratio | Watch this | Moderate | Review / narrative | Visceral fat is a metabolic risk factor for peripheral neuropathy beyond overall weight. | Diabetic neuropathy review (opens in a new tab) |
| Zinc | Don't overdo | Moderate | Review / narrative | Excess zinc (high-dose supplements, denture creams) depletes copper and causes a reversible myeloneuropathy. | Zinc-induced copper deficiency (opens in a new tab) |
| Carbohydrate | Don't overdo | Emerging | RCT / meta-analysis | Refined and high-glycemic carbohydrate raises the glucose burden on nerves (whole-food carbs are not the concern). | Glucose & nerve damage (opens in a new tab) |
| Colours a day | Watch this | Emerging | Review / narrative | A produce-rich diet supplies antioxidants and supports the glycemic control that protects nerves. | Diabetic neuropathy review (opens in a new tab) |
| Cook real food | Do this | Emerging | RCT / meta-analysis | Cooking real food supports glycemic control and reduces the refined carbs that burden nerves. | Glucose & nerve damage (opens in a new tab) |
| EPA/DHA (omega-3) | Eat enough of | Emerging | RCT / trial | Omega-3 fatty acids are neuroprotective and reduced incidence of chemotherapy-induced peripheral neuropathy in an RCT. | Omega-3 & peripheral neuropathy (opens in a new tab) |
| Folate (B9) | Eat enough of | Emerging | Review / narrative | Folate deficiency contributes to peripheral neuropathy through the homocysteine/B-vitamin pathway. | Nutritional & toxic neuropathy (opens in a new tab) |
| Movement (breaking up sitting) | Do this | Emerging | Review / narrative | Reducing sedentary time supports the glycemic control that protects nerves. | Diabetic neuropathy review (opens in a new tab) |
| Niacin (B3) | Eat enough of | Emerging | Review / narrative | Niacin deficiency (pellagra) can include peripheral neuropathy alongside dermatitis and cognitive change. | Nutritional & toxic neuropathy (opens in a new tab) |
| Saturated fat | Don't overdo | Emerging | Review / narrative | Dyslipidemia is an independent risk factor for peripheral neuropathy; high triglycerides track with nerve-fiber loss. | Dyslipidemia & neuropathy (opens in a new tab) |
| Selenium | Don't overdo | Emerging | Review / narrative | Selenium toxicity (selenosis, usually from megadose supplements) can include nerve damage. | Selenosis & nerve damage (opens in a new tab) |
| Sleep duration | Watch this | Emerging | RCT / trial | Neuropathic pain and poor sleep reinforce each other; short sleep worsens pain, and easing pain improves sleep. | Neuropathic pain & sleep (opens in a new tab) |
| Sleep quality (refreshed) | Watch this | Emerging | RCT / trial | Nerve-pain patients have fragmented, unrefreshing sleep; better sleep quality helps pain and function. | Neuropathic pain & sleep (opens in a new tab) |
| Supplement discipline | Do this | Emerging | Systematic review | Sensible supplementing matters here: too little B12 or too much B6 both damage nerves, so keep B6 supplements low and check B12. | Vitamin B6 & neuropathy (opens in a new tab) |
| Vitamin D | Eat enough of | Emerging | Cohort / observational | Vitamin D deficiency is common in diabetic peripheral neuropathy and associated with more severe, subclinical nerve dysfunction. | Vitamin D & diabetic neuropathy (opens in a new tab) |
Held for the whole Neurological & Mental Health system
These rows name no single condition. The Map records them against the whole body system, so they are shown separately rather than folded in.
| Nutrient or lever | Direction | Strength | Evidence type | What was found | Source |
|---|---|---|---|---|---|
| Falling & staying asleep | Watch this | Strong | RCT / meta-analysis | Insomnia roughly doubles the longitudinal risk of developing depression. | Baglioni et al., J Affect Disord 2011 (insomnia as predictor of depression, meta-analysis) (opens in a new tab) |
| Loneliness — reduce | Watch this | Strong | Established clinical | Social isolation and loneliness are modifiable risk factors for dementia; social interventions can slow cognitive decline. | Social isolation and dementia review (2025) (opens in a new tab) |
| Manganese | Don't overdo | Strong | Established clinical | Manganese excess accumulates in the basal ganglia and causes MANGANISM — a Parkinson-like extrapyramidal syndrome (bradykinesia, rigidity, tremor, gait/speech changes). Chiefly from inhalation (welding/mining), contaminated water, or IV/parenteral nutrition and liver disease; the oral UL is 11 mg. | NIH DRI / manganism literature (opens in a new tab) |
| Manganese | Don't overdo | Strong | RCT / meta-analysis | Manganese excess accumulates in the basal ganglia and causes MANGANISM — a Parkinson-like extrapyramidal syndrome (bradykinesia, rigidity, tremor, gait/speech changes). Chiefly from inhalation (welding/mining), contaminated water, or IV/parenteral nutrition and liver disease; the oral UL is 11 mg. | Manganese exposure and cognitive performance: A meta-analytical approach, Environ Pollut 2023 (opens in a new tab) |
| Sodium | Eat enough of | Strong | Established clinical | Acute severe hyponatremia causes cerebral edema, confusion, seizures, coma and can be lethal; it is the most common electrolyte disorder (usually from water excess/illness, not low salt intake). | LPI / StatPearls – Hyponatremia (opens in a new tab) |
| Sodium | Eat enough of | Strong | Established clinical | Acute severe hyponatremia causes cerebral edema, confusion, seizures, coma and can be lethal; it is the most common electrolyte disorder (usually from water excess/illness, not low salt intake). | Linus Pauling Institute — Sodium (opens in a new tab) |
| Water | Don't overdo | Strong | Established clinical | Overhydration (drinking faster than the kidneys can excrete, ~0.8-1 L/hour) dilutes blood sodium -> hyponatremia/water intoxication: headache, nausea, confusion, seizures, cerebral edema, coma and death. Seen in endurance athletes and psychogenic polydipsia. (Directly connects to the Sodium deficiency row.) | Water-intoxication systematic review (opens in a new tab) |
| Belonging (groups / third place) | Watch this | Moderate | Established clinical | Group engagement and community connection help preserve cognition and mental health. | Social engagement and cognition review (2025) (opens in a new tab) |
| Breath (how you breathe) | Watch this | Moderate | RCT / meta-analysis | Slow breathing shifts autonomic balance toward parasympathetic activity, reducing stress and anxiety. | Slow-paced breathing meta-analysis, Mindfulness 2024 (opens in a new tab) |
| Copper | Don't overdo | Moderate | Established clinical | Copper accumulation (Wilson's disease) causes neurological (tremor, dystonia, dysarthria) and psychiatric symptoms, plus Kayser-Fleischer eye rings. | Wilson's disease literature (opens in a new tab) |
| Daytime alertness | Watch this | Moderate | Established clinical | Excessive sleepiness reduces mental processing, concentration and reaction time. | Sleepiness and neurocognitive-function literature (opens in a new tab) |
| Inner circle (close ties) | Watch this | Moderate | Established clinical | Rich social ties protect mental and cognitive health; isolation raises dementia risk. | Social engagement and cognition review (2025) (opens in a new tab) |
| Magnesium | Don't overdo | Moderate | Established clinical | Hypermagnesemia causes lethargy, muscle weakness, difficulty breathing and depression. | NIH ODS – Magnesium (opens in a new tab) |
| Molybdenum | Eat enough of | Moderate | Established clinical | Dietary deficiency is essentially unreported; the genetic molybdenum cofactor deficiency (MoCD) causes neonatal seizures, severe brain degeneration and early death. One TPN case caused headache, tachycardia and night blindness. | MoCD literature / NIH ODS – Molybdenum (opens in a new tab) |
| Molybdenum | Eat enough of | Moderate | Established clinical | Dietary deficiency is essentially unreported; the genetic molybdenum cofactor deficiency (MoCD) causes neonatal seizures, severe brain degeneration and early death. One TPN case caused headache, tachycardia and night blindness. | NIH Office of Dietary Supplements — Molybdenum (opens in a new tab) |
| Screens before bed — cut back | Do this | Moderate | RCT / meta-analysis | Problematic smartphone use is linked to poorer mental health - higher stress, anxiety and depression. | Yang et al., Psychiatry Research 2020 (meta-analysis) (opens in a new tab) |
| Sleep duration | Watch this | Moderate | Established clinical | Insufficient sleep impairs cognition and mood regulation. | Sleep-cognition/mood literature (AHA statement) (opens in a new tab) |
| Sleep quality (refreshed) | Watch this | Moderate | RCT / meta-analysis | Poor sleep quality raises risk of depression, anxiety and cognitive dysfunction. | Sleep-quality and mental-health meta-analyses (opens in a new tab) |
| Staying in touch (social reps) | Do this | Moderate | Established clinical | Ongoing social engagement helps protect cognitive function. | Social engagement and cognition review (2025) (opens in a new tab) |
| Vitamin E | Don't overdo | Moderate | RCT / meta-analysis | Two trials found increased hemorrhagic (brain) stroke risk with alpha-tocopherol supplements. | NIH ODS – Vitamin E (ATBC; Physicians' Health Study) (opens in a new tab) |
| Warmth & quality of ties | Watch this | Moderate | Cohort / observational | Relationship quality predicted cognitive health; secure attachment predicted better memory years later. | Harvard Study of Adult Development (opens in a new tab) |
| Alcohol — cut back | Do this | Emerging | Established clinical | Alcohol contributes to alcohol-use disorders, epilepsy and other mental-health and neurological harms. | Global Burden of Disease Alcohol Collaborators, Lancet 2018 (opens in a new tab) |
| Balance (one-leg stand) | Watch this | Emerging | Established clinical | Single-leg balance is impaired by neurological conditions (Parkinson's, MS, dementia), reflecting central postural control. | Single Leg Stance Test (clinical review) (opens in a new tab) |
| Blood oxygen (SpO2) | Watch this | Emerging | Established clinical | Hypoxemia reduces oxygen delivery to the brain, causing confusion and, if chronic, cognitive impairment. | Hypoxemia literature (opens in a new tab) |
| Blood pressure | Watch this | Emerging | RCT / meta-analysis | High blood pressure is the leading risk factor for stroke and is linked to vascular cognitive decline. | Prospective Studies Collaboration / hypertension literature (opens in a new tab) |
| Breathing rate | Watch this | Emerging | Established clinical | Respiratory rate is often the first vital sign to change with a shift in cardiac or neurological state. | Vital-signs assessment guide (opens in a new tab) |
| Cardio / VO2max | Watch this | Emerging | Cohort / observational | Low CRF is associated with higher risk of dementia and depression across cohort meta-analyses. | Lang et al., BJSM 2024 (opens in a new tab) |
| Sleep regularity | Watch this | Emerging | Cohort / observational | Irregular sleep patterns are associated with poorer cognitive and academic performance. | Circadian-disruption / performance literature (opens in a new tab) |