Evidence Dashboard
A comprehensive overview of the scientific evidence underlying Zenova Wellness protocols โ organized by strength, domain, and recency.
Evidence Strength Overview
Featured Research
Time-Restricted Eating Windows
๐ข StrongMeta-analyses of 16:8 protocols show significant improvements in insulin sensitivity and body composition in overweight adults.
Fasting ยท MetabolismGut-Brain Axis Signaling
๐ก ModerateCohort studies reveal bidirectional communication between enteric nervous system and CNS via vagal afferents, influencing mood and cognition.
Gut Health ยท CognitiveZone 2 Training & Fat Oxidation
๐ข StrongRCTs demonstrate Zone 2 exercise maximizes mitochondrial efficiency and fat oxidation rates in both trained and untrained populations.
Movement ยท MetabolismSleep & Hormonal Recovery
๐ข StrongGrowth hormone secretion peaks during N3 deep sleep. Restriction to <6 hrs/night reduces GH pulsatility by up to 70% in controlled studies.
Sleep ยท HormonesRecently Added
Autophagy Upregulation via Extended Fasts
Added July 2026 ยท Fasting
Creatine & Cognitive Function in Sleep-Deprived States
Added July 2026 ยท Supplements
Resistance Training & Insulin Receptor Density
Added July 2026 ยท Movement
Research Topics
Explore the evidence base across 8 major domains. Each topic is expandable with detailed research tables, diagrams, and confidence ratings.
Intermittent Fasting Research
Key Fasting Research Timeline (2000โ2024)
Synthesized Research Findings
| Study Type | Key Finding | Population | Evidence Tier |
|---|---|---|---|
| Meta-analysis | 16:8 TRE reduces body weight by 3โ5% over 8โ12 weeks | Overweight adults | ๐ข Strong |
| RCT | Alternate-day fasting improves LDL cholesterol in 12-week intervention | Healthy adults | ๐ข Strong |
| RCT | Early TRE (eating before 3 PM) enhances insulin sensitivity vs late eating | Prediabetic men | ๐ข Strong |
| Cohort | Consistent meal timing associated with lower cardiometabolic risk markers | Large population | ๐ก Moderate |
| Pilot | 5:2 protocol preserves lean mass during weight loss in active individuals | Recreationally active | ๐ก Moderate |
| Animal model | Extended fasting induces robust autophagy in hepatic tissue | Mouse model | ๐ด Preliminary |
| Mechanistic | Ketone body ฮฒ-HB acts as signaling molecule for BDNF expression | In vitro / animal | ๐ด Preliminary |
| Meta-analysis | No significant muscle loss difference between IF and continuous energy restriction | Adults with obesity | ๐ข Strong |
Mechanistic Flowchart: Metabolic Switching
Common Misconceptions
โ Myth: "Fasting puts your body in starvation mode"
โ What research shows: Metabolic rate is maintained or slightly increased during fasts up to 72 hours.
โ Myth: "Skipping breakfast always harms performance"
โ What research shows: Studies on habitual breakfast-skippers show no cognitive or physical performance deficit when meal timing aligns with circadian preferences.
โ Myth: "IF causes muscle wasting"
โ What research shows: When protein intake is adequate and resistance training is maintained, lean mass preservation is comparable between IF and traditional dieting.
โ Myth: "You must eat every 2โ3 hours to boost metabolism"
โ What research shows: Meal frequency has no significant independent effect on metabolic rate. Total energy and macronutrient intake are the primary determinants.
โ Myth: "IF works equally well for everyone"
โ What research shows: Response variability is significant. Pre-menopausal women, individuals with disordered eating history, and those on certain medications may require modified approaches.
Overall Research Confidence: Intermittent Fasting
82/100Strong human trial data for weight management and insulin sensitivity. Caveats: Long-term (>2 year) data limited; individual variability is high.
Metabolic Health & Insulin Sensitivity
Insulin Signaling Cascade
Metabolic Syndrome Risk Factor Network
Research Summary
| Study Type | Key Finding | Population | Tier |
|---|---|---|---|
| RCT | Caloric restriction improved insulin sensitivity by 25% | Overweight adults | ๐ข Strong |
| Meta-analysis | IF reduced fasting insulin by 20โ31% | Mixed | ๐ข Strong |
| Cohort | Mediterranean diet linked to 30% lower MetS risk | Adults 40โ70 | ๐ก Moderate |
| RCT | Resistance training improved glucose uptake independent of weight loss | T2D risk adults | ๐ข Strong |
| Pilot | Time-restricted eating improved postprandial glucose | Adults with prediabetes | ๐ก Moderate |
| RCT | Sleep restriction for 1 week reduced insulin sensitivity by 25% | Healthy adults | ๐ข Strong |
Lifestyle Impact Heatmap: Intervention โ Metabolic Markers
| Intervention | Fasting Glucose | Insulin Levels | HbA1c | HOMA-IR |
|---|---|---|---|---|
| Intermittent Fasting | +++ | +++ | ++ | +++ |
| Low-Carb Diet | +++ | +++ | +++ | +++ |
| Resistance Training | +++ | +++ | ++ | +++ |
| Zone 2 Cardio | ++ | +++ | ++ | +++ |
| Quality Sleep | ++ | ++ | + | ++ |
| Stress Reduction | + | + | ~ | + |
+++ = Strong effect | ++ = Moderate | + = Mild | ~ = Insufficient data
Overall Research Confidence
88/100Exceptionally well-studied domain with decades of clinical trial data. Insulin resistance mechanisms well-characterized.
Gut Microbiome & Nutrition
Intestinal Ecosystem Cross-Section
Foods That Harm Diversity
- โข Ultra-processed foods (emulsifiers, preservatives)
- โข Artificial sweeteners (sucralose, aspartame)
- โข Excess alcohol consumption
- โข Low-fiber, refined carbohydrate diet
- โข Chronic antibiotic use without restoration
Foods That Build Diversity
- โข Fermented foods (kimchi, kefir, sauerkraut)
- โข Prebiotic fiber (garlic, onion, asparagus)
- โข Polyphenol-rich foods (berries, green tea, dark chocolate)
- โข Omega-3 fatty acids (fatty fish, walnuts)
- โข Diverse plant foods (โฅ30 varieties/week)
Diet-Microbiome Research
| Study Type | Key Finding | Tier |
|---|---|---|
| RCT | 6 servings/day of fermented foods increased microbiome diversity over 10 weeks | ๐ข Strong |
| Cohort | High-fiber diet associated with 40% greater Prevotella abundance | ๐ก Moderate |
| RCT | Ultra-processed food consumption reduced Bifidobacterium within 2 weeks | ๐ข Strong |
| Cohort | Mediterranean diet adherence correlated with higher SCFA production | ๐ก Moderate |
| Animal model | Artificial sweeteners altered gut bacterial composition and glucose tolerance | ๐ด Preliminary |
Probiotic Strain Evidence
| Strain | Researched Benefit | Evidence Tier |
|---|---|---|
| Lactobacillus acidophilus | Digestive comfort, lactose digestion support | ๐ข Strong |
| Bifidobacterium longum | Reduced anxiety markers, stress resilience | ๐ก Moderate |
| Saccharomyces boulardii | Antibiotic-associated diarrhea prevention | ๐ข Strong |
| L. rhamnosus GG | Gut barrier integrity, immune modulation | ๐ข Strong |
| B. infantis 35624 | IBS symptom relief (bloating, pain) | ๐ก Moderate |
Overall Research Confidence
68/100Rapidly growing field. Strain-specific evidence varies significantly. Population-level microbiome associations are well-documented, but causality is still being established.
Hormonal Regulation
Hormone Interaction Web
Green arrows = stimulatory | Red arrows = inhibitory
24-Hour Hormone Fluctuation
Hormonal Intervention Research
| Intervention | Hormonal Outcome | Tier |
|---|---|---|
| Sleep extension to 8+ hrs | GH pulsatility restored; cortisol normalized | ๐ข Strong |
| Resistance training 3ร/wk | Testosterone โ 15โ20%; cortisol โ acutely | ๐ข Strong |
| 16:8 Intermittent fasting | Ghrelin rhythm normalized; leptin sensitivity โ | ๐ก Moderate |
| Mediterranean diet (6 mo) | Estrogen metabolite ratios improved | ๐ก Moderate |
| Mindfulness meditation (8 wks) | Cortisol awakening response โ 25% | ๐ข Strong |
| Chronic sleep deprivation (<6 hrs) | Leptin โ 18%, ghrelin โ 28%, insulin resistance โ | ๐ข Strong |
Overall Research Confidence
85/100Endocrinology is a mature field. Circadian hormone patterns well-established. Interaction complexity makes individualization essential.
Exercise & Metabolism
Energy Systems Diagram
Heart Rate Zone Table (Based on 180 Max HR)
| Zone | BPM Range | Effort | Primary Fuel | Adaptation | Example |
|---|---|---|---|---|---|
| Zone 1 | 90โ108 | Very Light | Fat | Recovery | Walking |
| Zone 2 | 108โ126 | Light | Fat (Fatmax) | Mitochondrial biogenesis | Easy jog |
| Zone 3 | 126โ144 | Moderate | Mixed | Aerobic capacity | Tempo run |
| Zone 4 | 144โ162 | Hard | Glycogen | Lactate threshold | Intervals |
| Zone 5 | 162โ180 | Maximum | Phosphocreatine | VOโmax / power | All-out sprint |
HIIT vs Steady-State Comparison
โก HIIT
- Caloric Burn: High per minute (EPOC effect)
- Fat Oxidation: Elevated post-exercise
- CV Adaptation: VOโmax โโโ
- Time Efficiency: 15โ25 min sessions
- Recovery Demand: High (48 hrs recommended)
- Evidence: ๐ข Strong
๐ Steady-State
- Caloric Burn: Moderate per minute (volume-based)
- Fat Oxidation: Maximal during exercise (Zone 2)
- CV Adaptation: Mitochondrial density โโโ
- Time Efficiency: 30โ60 min sessions
- Recovery Demand: Low (daily feasible)
- Evidence: ๐ข Strong
Exercise-Metabolism Research
| Study Type | Key Finding | Tier |
|---|---|---|
| Meta-analysis | Resistance training increases GLUT4 receptor density by 30% | ๐ข Strong |
| RCT | Zone 2 cardio maximizes fat oxidation at 60โ70% HRmax | ๐ข Strong |
| RCT | HIIT and steady-state produce comparable fat loss when volume-matched | ๐ข Strong |
| Cohort | 150 min/wk moderate exercise โ all-cause mortality by 31% | ๐ข Strong |
| RCT | Combined aerobic + resistance training superior to either alone for insulin sensitivity | ๐ข Strong |
| Pilot | Morning exercise enhances circadian rhythm alignment more than evening exercise | ๐ก Moderate |
Overall Research Confidence
90/100One of the strongest evidence bases in health science. Exercise benefits are robust, well-replicated, and dose-dependent.
Sleep & Recovery Science
Sleep Architecture โ Typical 8-Hour Hypnogram
Sleep Deprivation Impact
๐ด 1 Night Poor Sleep
- โข Reaction time โ 5%
- โข Cortisol โ next evening
- โข Hunger hormones shift
๐ 1 Week Sleep Debt
- โข Insulin sensitivity โ 25%
- โข Working memory โ 25%
- โข Immune function impaired
โ ๏ธ Chronic Restriction
- โข Obesity risk โ 55%
- โข Cardiovascular risk โ
- โข Cognitive decline accelerates
โ Recovery Timeline
- โข 1 night: Alertness restores
- โข 3โ5 nights: Glucose normalizes
- โข 2 weeks: Full cognitive recovery
Sleep-Metabolism Research
| Study Type | Key Finding | Tier |
|---|---|---|
| RCT | Sleep extension restores glucose metabolism after acute debt | ๐ข Strong |
| RCT | 4 hrs sleep ร 6 nights = pre-diabetic glucose levels in healthy adults | ๐ข Strong |
| Meta-analysis | Short sleep (<6 hrs) associated with 48% higher obesity risk | ๐ข Strong |
| Cohort | Irregular sleep timing linked to metabolic syndrome independent of duration | ๐ก Moderate |
| RCT | Cool sleeping environment (65โ68ยฐF) enhances slow-wave sleep by 15% | ๐ก Moderate |
Recovery Interventions
| Intervention | Mechanism | Evidence | Timing |
|---|---|---|---|
| Cold Exposure | โ core temp, โ inflammation | ๐ก | Post-workout or AM |
| Sauna (15โ20 min) | โ heat shock proteins, โ GH | ๐ก | Evening, 2+ hrs before bed |
| Magnesium Glycinate | GABA receptor modulation, muscle relaxation | ๐ข | 30โ60 min before bed |
| Meditation / Breathwork | โ cortisol, โ parasympathetic tone | ๐ข | Pre-sleep wind-down |
| Sleep Restriction Therapy | Consolidates sleep drive, treats insomnia | ๐ข | CBT-I protocol |
Overall Research Confidence
87/100Sleep science is well-established with extensive controlled studies. Mechanisms of sleep debt and cognitive decline are robust.
Cognitive Performance & Brain Health
Brain-Body Connection Pathways
Neuroplasticity Factors
Exercise
BDNF โ 200โ300% post-exercise
๐ขQuality Sleep
Glymphatic clearance, memory consolidation
๐ขPolyphenols
Synaptic function support via antioxidants
๐กIF / Fasting
Ketone-driven BDNF and autophagy
๐กStress Reduction
Cortisol regulation, prefrontal resilience
๐ขCognitive Domain Impact Matrix
| Intervention | Attention | Memory | Mood | Exec. Function |
|---|---|---|---|---|
| Aerobic Exercise | +++ | +++ | +++ | +++ |
| Intermittent Fasting | + | + | ~ | + |
| Mediterranean Diet | ++ | ++ | ++ | + |
| Sleep Optimization | +++ | +++ | +++ | +++ |
| Stress Reduction | +++ | + | +++ | ++ |
| Social Engagement | + | ++ | +++ | ++ |
+++ = Strong Evidence | ++ = Moderate | + = Preliminary | ~ = Insufficient
Overall Research Confidence
72/100Exercise-cognition link is strong. Dietary approaches have growing but heterogeneous evidence. Long-term neuroprotection data still emerging.
Supplementation Evidence
Evidence Tier Pyramid
Comprehensive Supplement Evidence
| Supplement | Mechanism | Dose Range | Tier | Key Caveat |
|---|---|---|---|---|
| Creatine | PCr resynthesis, energy buffer | 3โ5 g/day | ๐ข | Most studied ergogenic aid |
| Vitamin D3 | Calcium metabolism, immune | 1000โ5000 IU/day | ๐ข | Test levels; pair with K2 |
| Magnesium | 300+ enzymatic reactions | 200โ400 mg/day | ๐ข | Form matters (glycinate best) |
| Omega-3 EPA/DHA | Anti-inflammatory, membranes | 1โ3 g EPA+DHA | ๐ข | Quality varies widely |
| Caffeine | Adenosine antagonist | 3โ6 mg/kg | ๐ข | Half-life ~5 hrs; timing key |
| Zinc | Immune, testosterone synthesis | 15โ30 mg/day | ๐ก | Best if deficient |
| Vitamin B12 | Methylation, energy metabolism | 500โ1000 mcg | ๐ก | Methylcobalamin preferred |
| Probiotics | Microbiome diversity support | 1โ50B CFU | ๐ก | Strain-specific effects |
| Ashwagandha | Adaptogenic, cortisol โ | 300โ600 mg/day | ๐ก | Short-term studies mostly |
| Berberine | AMPK activation, glucose | 500 mg 2โ3ร/day | ๐ก | Drug interactions possible |
| CoQ10 | Mitochondrial electron transport | 100โ300 mg/day | ๐ก | Important with statins |
| Alpha-Lipoic Acid | Antioxidant, glucose disposal | 300โ600 mg/day | ๐ก | R-form more bioavailable |
| NMN / NR | NAD+ precursor | 250โ1000 mg/day | ๐ด | Animal data promising; human RCTs limited |
| Spermidine | Autophagy induction | 1โ5 mg/day | ๐ด | Mostly observational data |
| Fisetin | Senolytic properties | 100โ500 mg/day | ๐ด | Very early-stage research |
Bioavailability Comparisons
Magnesium Forms
Vitamin D Forms
Omega-3 Sources
โ ๏ธ Safety & Interaction Flags
| Combination | Risk Level | Recommendation |
|---|---|---|
| Blood thinners + Omega-3 (>3 g) | High | May potentiate anticoagulant effect โ consult provider |
| Statins + CoQ10 depletion | Moderate | Statins deplete CoQ10 โ supplementation recommended |
| Diabetes meds + Berberine | High | Additive hypoglycemia risk โ discuss with provider |
| Thyroid meds + Selenium | Moderate | May alter thyroid hormone conversion โ monitor levels |
| MAOIs + Stimulant herbs | High | Serotonin syndrome risk โ contraindicated |
Overall Research Confidence
62/100Highly variable by compound. A few supplements (creatine, Vitamin D) have robust evidence. Many popular supplements have only preliminary or mechanistic data. Always prioritize food-first approaches.
Research Tools
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Evidence Strength Calculator
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Study Type Explainer
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Zenova Confidence Ratings
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