Independent evidence review
Why a tendon and a bone got injured at the same time, and what the evidence says about recovering well
The one-screen summary
The most likely big levers
- Low Energy Availability / RED-S. Eating too little overall for the training load. This is the leading, frequently-missed cause of bone stress injuries in lean, active women. strong
- Training-load overload. Teaching classes and running stacking on the same bone and tendon, plus volume or terrain spikes. strong principle
- Running mechanics. High impact loading rate and trail-terrain variability, plus any recent move to minimalist shoes. emerging
- Vitamin D at 55°N. Northern winters mean most women are low; fix it only if measured low. strong (if deficient)
How to read the evidence labels
Every substantive claim carries a grade. The grade reflects the quality and consistency of the actual evidence, not how confident a website sounds. A meta-analysis of weak studies is still weak.
| Label | Means |
|---|---|
| strong | Multiple good trials, or consistent high-quality reviews, plus a clear mechanism. |
| emerging | Promising but limited: small trials, surrogate markers, or mixed-but-trending. |
| weak | Sparse, low-quality, observational-only, or underpowered. |
| contested | Credible evidence on both sides; careful researchers disagree. |
| likely unreliable | A fashionable claim on thin or biased data, or a strong claim resting on little. |
02 · Root cause
Why a tendon problem and a bone stress injury appeared together
Co-occurring tendinopathy and bone stress injury in a highly active woman usually isn't bad luck. It is several risk factors stacking on the same tissue. Here are the candidate causes, ranked by how much they likely matter for this case.
1. Low Energy Availability / RED-S, the leading and easily-missed driver strong
"Relative Energy Deficiency in Sport" (RED-S) is what happens when you don't eat enough to cover both your training and your basic physiology. A lean, very-high-volume woman who teaches on her feet, runs trails, and eats "clean" is the textbook missed case: performance and physique can look fine while bone is already being undermined.
- Below roughly 30 kcal per kg of fat-free mass per day, the body throttles its "expensive" systems. Reproductive hormones, thyroid (T3), and IGF-1 fall, which directly removes bone-building signals. strong
- In controlled studies, bone formation drops first (at moderate restriction) and resorption rises only at severe restriction. So the earliest harm is "building less," which a normal DXA scan may not yet show. strong (direction)
- Irregular or absent periods are a usable warning light, associated with roughly 2–4× the stress-fracture risk. emerging
An appetite-suppressing eating pattern (high protein plus very-low-carb eating are two of the strongest hunger blunters known) can quietly push a high-volume athlete under her energy needs without feeling hungry. That is a total-energy problem, not a carbs argument. Question for her clinicians: has anyone compared her intake to her actual training expenditure, and documented her menstrual history as a vital sign?
2. Training-load overload strong principle
Bone takes weeks to remodel, and tendon collagen turns over slowly. Stacking on-feet teaching (cumulative, eccentric load) with trail running (impact load) on the same structures is a classic recipe for both injuries, especially after a jump in volume, intensity, hills, or technical terrain.
The popular "acute:chronic workload ratio" number is contested, so don't treat a specific ratio as gospel. contested But the underlying principle (progress gradually, avoid abrupt spikes) is sound. strong
3. Biomechanics & gait on uneven terrain emerging
- The best-evidenced biomechanical marker for bone stress injury is a high vertical loading rate, meaning how fast force hits at footstrike. It is not peak force and not simply pronation. A meta-analysis found peak ground-reaction force didn't separate stress-fracture cases from controls, but loading rate did. emerging→strong
- Trail terrain measurably changes mechanics, adding about +20% leg stiffness and +26% step variability versus smooth ground, which loads foot bones and ankle/foot tendons (tibialis posterior, peroneal, Achilles) more unpredictably. emerging
- A rapid switch to minimalist, "barefoot," or zero-drop shoes is a documented cause of metatarsal bone-stress injury (in one trial, 10 of 19 runners developed foot bone-marrow oedema). That is directly relevant to a suspected foot stress fracture. strong
4. Vitamin D & bone inputs at high latitude strong (latitude fact)
At ~55°N (Klaipėda), the sun is too weak for the skin to make vitamin D from roughly October to March. Lithuanian data show winter blood vitamin D averaging ~57–59 nmol/L, with deficiency in the majority of women. Low vitamin D plus low dietary calcium weakens the mineral side of bone. The fix is to measure and correct a real deficiency, not to megadose blindly (which doesn't help people who are already replete). strong (if deficient)
Biomechanics, fuelling, and vitamin D all raise or lower risk, but the loading decision depends entirely on which bone is injured and how badly. That is the next section.
03 · Healing, prognosis & the safety-critical map
How these heal, and why which bone matters more than how much it hurts
This is the most safety-critical section. Some stress-fracture sites heal predictably with gradual loading. Others sit in a poor blood supply or on the "tension" side of the bone, where loading too early risks a fracture that won't unite, or a complete break needing surgery.
An MRI has been done, and the initial read suspects a stress fracture. That supports the working picture. The questions that now matter most are the exact site, the grade (severity), and whether it sits in a low-risk or high-risk location, because those determine whether and when loading is safe. The map below is what to ask the radiologist and clinician to pin down.
Until the exact bone and grade are confirmed by a clinician reading the imaging, treat a suspected stress fracture as potentially high-risk: off-load it. Never apply "tissues like load, so load it" logic to a high-risk or not-yet-localised fracture.
The low-risk vs high-risk site map
A site is high-risk because of either a vascular watershed (poor blood supply) or tension-side mechanics (the bone is being pulled apart, not pushed together) at the injury.
Lower-risk sites
Generally tolerate graded, pain-guided loading once confirmed
- Posteromedial tibia (shin), fastest at ~44 days
- 2nd–4th metatarsal shafts
- Fibula
- Calcaneus (heel)
- Femoral shaft
- Pubic ramus, sacrum
- Medial femoral neck (compression side)
Higher-risk sites ⚠
Do not load early; risk of non-union or surgery
- Tarsal navicular, slowest at ~127 days
- Anterior tibial cortex ("dreaded black line")
- Femoral neck, tension side (highest stakes)
- Base of 5th metatarsal (Jones)
- Medial malleolus
- Great-toe sesamoids, talus
- Proximal 2nd metatarsal base
| High-risk site | Why it's high-risk | Typical management |
|---|---|---|
| Tarsal navicular | Central third is a blood-supply watershed and takes peak foot-strike force | Non-weight-bearing ≥6 wk; CT-confirmed healing before running |
| Anterior tibial cortex | Tension side of the shin; can progress to a complete fracture; often invisible on early X-ray | Often 3–6 months; surgery (nail) if it won't heal |
| Femoral neck (tension) | Tension-side; displacement risks death of the hip's blood supply (AVN) | Usually urgent surgical fixation |
| Base of 5th metatarsal (Jones) | Watershed blood supply, so high non-union and refracture rates | Non-weight-bearing cast or surgical screw (athletes) |
| Medial malleolus, sesamoids, talus | Intra-articular and/or poor blood supply; X-ray often negative | Off-load; frequently surgical in athletes |
Return-to-sport time depends on the site
Tendinopathy heals on a continuum, not a switch
Adding or removing load moves the tendon along this line; earlier means more reversible. Realistic timelines: mild 2–4 weeks, established 6–12 weeks, give a loading programme ≥3 months, full return up to a year.
04 · Diet & nutrition, including the ancestral / metabolic lens
What feeds bone and tendon repair, plus an honest test of the ancestral claims
Both mainstream and ancestral nutrition claims get the same scrutiny here. The biggest nutritional lever isn't a supplement. It's eating enough.
(a) Total energy. Are you eating enough overall for your training? This is the RED-S axis. It is settled, high-impact, and independent of macros. strong
(b) Carbs vs fat. The macro ratio. This is genuinely open and contested. contested
A verdict on one never settles the other. "You may not need carbs to run" does not license under-eating on a very-low-carb diet.
The master variable: total energy availability
Thresholds are useful heuristics from small studies, not exact cliffs, but the direction is robust.
Nutrients with real evidence for bone & tendon: a checklist
| Nutrient | What the evidence supports | Grade |
|---|---|---|
| Total energy | The master lever. Eat enough for the load, to a target or schedule rather than to hunger. | strong |
| Protein | 1.6–2.0 g/kg/day across ≥4 meals; preserves muscle in rehab, modestly bone-positive. The "protein harms bone" idea is refuted. | strong |
| Calcium | 1,000–1,500 mg/day, food-first. Calcium plus vitamin D cut stress fractures ~20% in a recruit trial. | strong |
| Vitamin D | Correct a measured deficiency (toward ~40 ng/mL). Crucial at 55°N in winter. No benefit if already replete. | strong (if low) |
| Vitamin C | Obligatory for collagen. Reach sufficiency (the effect is saturable), don't megadose. This is the nutrient a very-low-plant diet most threatens. | emerging |
| Magnesium / Zinc | Real cofactors; benefit comes mainly from correcting a deficiency, not from supplementing a replete person. | weak/conditional |
| Vitamin K2 (MK-7) | Oversold for bone. Best Western trials show no BMD or fracture benefit at supplement doses. | contested/negative |
Collagen / gelatin + vitamin C, timed before loading
About 15 g gelatin or collagen plus ~50 mg vitamin C, taken ~30–60 min before tolerated tendon rehab, roughly doubled a blood marker of collagen synthesis in the flagship study. But that study was 8 healthy men, and proof of faster real-world tendon or bone healing is still thin. It works only coupled to loading. Low-risk and plausibly useful, but worth honest expectations. emerging Bone broth is a poor, unreliable substitute, so use measured gelatin or collagen powder. weak
Steelman, then test: the ancestral / metabolic claims
✅ Hold up
- Cut ultra-processed food. A tightly controlled trial showed people ate +508 kcal/day on an ultra-processed diet matched for macros. strong
- Whole fruit is good, and it actually helps her by supplying carbohydrate that lowers RED-S risk. strong
- Organ meats are nutrient-dense, though liver's preformed vitamin A has a real ceiling (excess is linked to lower bone density). density
⚠️ Don't hold up (as stated)
- "Seed oils cause disease." This leans against the evidence: a large review found omega-6 had no effect on mortality, and higher linoleic acid tracked with lower mortality. contested→against
- Bikman's insulin framing is good science aimed at the wrong patient; her endurance-trained muscle is already highly insulin-sensitive. strong
- K2, or megadose vitamin C "for healing": oversold. contested
Very-low-carb / animal-based eating for this recovery
The case for it is real: high protein, nutrient-dense animal foods, no ultra-processed food, and endurance performance isn't sacrificed by being low-carb (fat adaptation is real). strong
A very-low-carb, mostly-meat diet stacks the two strongest appetite suppressants known (high protein plus ketosis). In a lean, very-high-volume woman who must stay in neutral-to-positive energy balance to heal bone, that can quietly drive under-fuelling, then Low Energy Availability, then impaired bone healing, without her ever feeling hungry. This is the single biggest nutrition risk here. emerging (the full chain in her)
Separately, on the macro axis: energy-matched ketogenic diets worsened bone-turnover markers in elite endurance athletes (more resorption, less formation), with formation staying suppressed even after carbs returned, the wrong direction for a healing stress fracture. strong (markers) contested (hard bone endpoint) And a very-low-plant diet most threatens vitamin C, which she needs right now for collagen.
Bottom line: macros stay genuinely open for performance; the part that is not open is avoiding under-fuelling. If she wants to eat animal-based, the priority is making sure she eats enough (scheduled meals, not appetite-led), keeps a vitamin-C source, and watches for menstrual changes.
05 · Environmental & dietary interferences
The "hidden toxin" questions, ranked honestly against the big levers
Several popular worries get the same scrutiny as mainstream dismissals. For a bone-and-tendon recovery, four of five are low-impact, and one local factor is genuinely worth a check.
| Factor | Evidence on the harm claim | Impact for this recovery |
|---|---|---|
| Klaipėda tap-water fluoride | strong on concentration; emerging on the fracture link | Low to medium: the one to actually check |
| Caffeine / coffee | strong, meaning no meaningful effect at normal intake | Negligible |
| Seed oils / omega-6 | contested, leans not-harmful | Low / negligible |
| Microplastics / EDCs | weak, no human bone or tendon outcomes | Negligible to low, unquantifiable |
| Cosmetics (aluminium / parabens) | weak / overstated | Negligible |
Peer-reviewed data put Klaipėda's groundwater fluoride at 1.7–2.2 mg/L, above the EU/WHO drinking-water limit of 1.5 mg/L (a comparison city, Kaunas, sits at ~0.2). In that study, 66% of local 12-year-olds showed dental fluorosis versus 4% in the low-fluoride area, a real signature of elevated lifetime intake. A 2025 dose-response review finds fracture risk starts rising above ~1.5 mg/L (earlier in older women). strong (concentration) emerging (fracture link)
What this is and isn't: at her age the extra fracture risk is likely modest, and far below training load and fuelling. But it is the only factor here that is both above a regulatory limit and has a bone mechanism, so it is worth a cheap, concrete check: look up her actual current district value from Klaipėdos vanduo (treatment or blending may have lowered it since the 2007 study), and tally total fluoride intake (water, toothpaste, black tea).
Aggressive avoidance behaviours can backfire. Skipping fats to "avoid seed oils," or using coffee to blunt appetite, both quietly lower energy availability, which is the high-impact lever. Don't let low-impact worries crowd out fuelling, load management, and bone nutrients.
Hard water, by the way, is mildly favourable for bone (extra calcium and magnesium), not a risk. weak/neutral
06 · Evidence-based recovery
Rest vs. load, and a criteria-based way back to the trails
"Rest and do nothing" is a reasonable first move for an angry tendon, and mandatory for an unconfirmed or high-risk bone, but it is a poor long-term strategy. Tendon and bone both decondition without load.
The adjudication, by evidence
Why not just rest?
Removing all load makes tendon lose stiffness and strength, and makes bone lose density. The "rest until it stops hurting, then return to full load" loop hands the original load to a weaker tissue, and it re-injures. strong (mechanism)
The resolution: relative loading
Remove the offending load, keep tolerable, progressive load. This is the "envelope of function." For tendinopathy and confirmed low-risk bone, progressive loading beats passive rest. emerging→strong
This "load it" logic applies only to confirmed low-risk tissue. A high-risk or unconfirmed stress-fracture site must be off-loaded, never loaded on this reasoning.
Recovery strategies: what works, what doesn't
| Strategy | Verdict | Grade |
|---|---|---|
| Heavy-slow-resistance or eccentric loading (tendinopathy) | First-line. Equally effective long-term, so pick the one she'll actually stick to. | strong |
| Criteria-based return-to-run (gated by pain-free walking and hops, not the calendar) | The right structure; exact thresholds are expert opinion. Low-risk bone only. | emerging |
| Cross-training (aqua-jogging, anti-gravity treadmill) | Maintains fitness without loading the injury (clinician-cleared). | emerging |
| Isometrics "for instant pain relief" | Overstated, not reliably better than other loading. Fine as a tolerable entry point. | weak/contested |
| ESWT (shockwave) | Modest; reasonable add-on for stubborn Achilles, not standalone. | weak→emerging |
| PRP injections (Achilles) | No better than a saline placebo. Don't pay for it. | strong (no benefit) |
| BFR (blood-flow-restriction) training | Promising bridge to preserve muscle when heavy loading isn't tolerated. | emerging |
| Routine NSAIDs around a bone injury | Best avoided, as regular use is associated with higher stress-fracture risk and impaired bone healing. | contested (precautionary) |
| Sleep (7–9 h) | Free, high-upside; strong rationale, thin hard-outcome trials. | strong plausibility |
| Elliptical as "safe cardio" | Low-impact isn't the same as low forefoot or Achilles load, so trial cautiously and symptom-gate. | caution |
A criteria-based ladder back to trail running
For a confirmed low-risk injury only, and gated on staying pain-free during and after each step. If site pain returns, drop back a level and add a rest day.
- Pain-free daily activities and walking (build to ~30–45 min); for bone, focal tenderness resolved.
- Pain-free single-leg hops plus reasonable strength symmetry.
- Walk-run intervals on flat, even ground; grow the run fraction by tolerance, not the clock.
- Continuous flat running; build volume gradually.
- Re-add intensity and speed after volume is tolerated.
- Trail layers last: technical terrain (ankle stability and proprioception), then downhill (high eccentric and impact loading rate), which is the classic trail re-injury trap. A ~5–10% cadence increase can lower loading rate on smoother sections.
07 · Mind & motivation during forced rest
Staying well and motivated, without loading the injury
For someone whose identity and daily reward come from movement, a forced layoff is a real psychological stressor. The good news: the mood dip usually peaks early and then eases, and there are evidence-backed ways to bridge it.
The pop "dopamine detox/reset" idea is not real neuroscience; dopamine isn't a tank you drain and refill. contested But the behaviour underneath it is well-supported. Behavioral activation, meaning deliberately scheduling enjoyable, meaningful, non-loading activities to replace the training reward, is one of the better-evidenced mood treatments. strong Use the behaviour, drop the myth.
What actually helps
- Keep "training" in a non-loading form. Aqua-jogging or deep-water running can preserve run fitness and the "I'm still an athlete" identity at near-zero impact (needs clinician clearance for a stress fracture). emerging
- Schedule rewarding activity (behavioral activation): a weekly menu of things she rates as enjoyable or meaningful, actually put in the calendar. strong
- Morning daylight and protected sleep (7–9 h): cheap, non-loading mood levers, especially relevant when she loses outdoor trail light. strong
- Broaden, don't amputate, the athlete identity. Lean on her coaching or teaching role. Strong athletic identity is a known risk factor for post-injury low mood, so keeping the identity alive in another form matters. emerging
- Controllable process goals ("today's rehab set," "30-min aqua-jog") beat outcome goals ("race by July"), and framing rest as her strategic choice supports motivation and rehab adherence. emerging
- Stay socially embedded in her gym and running community rather than withdrawing. emerging
Compulsive exercise and food restriction aren't just mental-health concerns. They can drive the very Low Energy Availability that causes stress fractures (one analysis found stress fractures in 70% of athletes with RED-S versus 25% without). If rest feels intolerable, or there is guilt about eating, that is worth raising gently with a clinician, because it bears on both healing and re-injury.
08 · Red flags
When to stop and seek urgent care
These warrant imaging and a clinician's review before any loading. When in doubt, off-load and get it checked.
- Groin or front-of-hip pain on weight-bearing, or pain when hopping. Can signal a femoral-neck stress fracture (high-risk; tension-side can be a surgical emergency). Inability to bear weight means urgent.
- Pain over the front of the mid-shin. Possible anterior-cortex ("dreaded black line") injury.
- Night pain or rest pain that no longer settles, which suggests a more advanced lesion.
- A sudden change from a dull ache to sharp, focal pain. Possible progression toward a complete fracture; stop loading.
- Focal tenderness over a known high-risk site (top of the navicular, base of the 5th toe-bone, inner ankle, big-toe sesamoids).
- Severe, disproportionate lower-leg pain or tightness with numbness. Possible acute compartment syndrome, an emergency; do not "run through it."
- Fever, unexplained weight loss, or a history of cancer with new bone pain: get checked to exclude non-overuse causes.
- Low mood, loss of enjoyment, or hopelessness that deepens rather than eases after the first weeks.
- Anxiety that interferes with sleep, work or teaching, or relationships.
- Exercising despite injury or advice; intense guilt or irritability when unable to train; food restriction.
- Any thoughts of self-harm: get urgent help now, not watch-and-wait.
09 · Prioritized actions
Where to put the effort, tiered by evidence and impact
Derived from the evidence actually found. Tier 1 is where the leverage is, so don't let Tier 3 curiosities crowd it out.
- Get the exact site and grade from the MRI before any loading. The scan is done and suggests a stress fracture; pinning down the location and severity gates the whole plan (low-risk means graded loading; high-risk or not-yet-localised means off-load). strong
- Screen for RED-S / Low Energy Availability: menstrual history, energy availability versus training load, bone-turnover markers, DXA. The biggest modifiable lever. strong
- Eat enough overall, to a target or schedule rather than to hunger; treat chronic under-fuelling as actively bone-suppressive. (Macro-agnostic.) strong
- Measure & correct vitamin D (late-winter) plus adequate calcium (1,000–1,500 mg, food-first) plus protein 1.6–2.0 g/kg across ≥4 meals. strong
- Relative, progressive loading rather than complete rest; avoid abrupt volume or terrain spikes. For tendinopathy, structured HSR or eccentric work. strong
- Trial a ~5–10% cadence increase; reintroduce smooth terrain before technical trail; downhill last. emerging
- Avoid abrupt minimalist or zero-drop shoe changes; adequate cushioning in recovery; consider a prefab or semirigid orthosis if a metatarsal or tibialis-posterior is involved. emerging
- Gelatin or collagen plus vitamin C ~30–60 min before tolerated rehab loading. emerging
- Cross-train to keep fitness without loading the injury (aqua-jog, anti-gravity treadmill, cycling, upper body). emerging
- Protect sleep; schedule rewarding non-loading activity; morning daylight; keep coaching identity and social ties. strong
- Check her actual Klaipėda tap-water fluoride and total fluoride intake. emerging
- Correct any measured magnesium, zinc, or vitamin C shortfall (don't megadose). weak
- Don't pay for PRP for Achilles (no benefit). strong (no benefit)
- ESWT only as an add-on; BFR as a muscle-preservation bridge. emerging
- Avoid routine NSAIDs around the bone injury. contested
- K2, seed-oil avoidance, cutting coffee, microplastic or cosmetic avoidance: low yield here, and "clean-eating" avoidances can backfire by lowering energy. contested→minor
Questions to bring to her clinicians
- From the MRI, what exactly is injured: which bone, which tendon, what grade, low- or high-risk site?
- Am I in low energy availability? (Menstrual history, energy-availability estimate, bone-turnover markers, DXA.)
- What is my late-winter vitamin D and dietary calcium, and should I correct them?
- Given a suspected foot stress fracture, did footwear or terrain or volume change recently?
- Could under-fuelling or compulsive training have contributed?
- What is my actual current tap-water fluoride (Klaipėdos vanduo), and total intake?
10 · References & method
Sources, method, and honest limitations
How this was made
Seven independent research passes (biomechanics; energy/RED-S and bone; healing and risk-sites; recovery protocols; nutrition and the metabolic/ancestral lens; environmental factors; psychology) each produced citation-graded notes. A single unified review then spot-checked the load-bearing claims against live primary sources, enforced consistent evidence grading, kept total energy strictly separate from macronutrient ratio, and confirmed the RED-S and high-risk-site coverage. Nine signature claims (including the Klaipėda fluoride figure, the keto bone-marker findings, the stress-fracture prevention trial, and the return-to-sport timelines) were re-verified against their primary sources and matched.
- No one here has examined her, so every "for her" point is a question for clinicians, not a finding.
- An MRI has been done, but the exact site, grade, and whether it is a low- or high-risk location are not known to me, and those specifics gate the plan.
- Her menstrual status, energy availability, vitamin D, dietary calcium, and current tap-water fluoride are also unknown here.
- Much female-specific and athlete-specific evidence is thin; several flagship nutrition and tendon studies are male-only.
- Several "healing" nutrition claims rest on blood markers, not proven real-world healing.
Key sources (year)
Energy availability, RED-S & bone
- Ihle & Loucks. Dose response of bone turnover to energy availability. J Bone Miner Res, 2004. pubmed.ncbi.nlm.nih.gov/15231009
- Loucks & Thuma. LH pulsatility & energy availability. J Clin Endocrinol Metab, 2003. pubmed.ncbi.nlm.nih.gov/12519869
- Mountjoy et al. IOC consensus on RED-S. Br J Sports Med, 2014. pubmed.ncbi.nlm.nih.gov/24620037
- Tenforde et al. Triad cumulative risk & bone stress injury. 2017. pubmed.ncbi.nlm.nih.gov/28038316
- Hutson et al. Menstrual dysfunction & bone stress injury in runners. 2021. pubmed.ncbi.nlm.nih.gov/34269142
- Lappe et al. Calcium + vitamin D & stress fractures in female Navy recruits. J Bone Miner Res, 2008. doi:10.1359/jbmr.080102
- VITAL. Supplemental vitamin D & fractures. N Engl J Med, 2022. nejm.org · NEJMoa2202106
- Vitamin D status of out-patients in Lithuania. PMC6037258, 2018. pmc.ncbi.nlm.nih.gov/PMC6037258
Healing, prognosis & risk sites
- Hoenig et al. Return to sport after low- and high-risk bone stress injuries (76 studies, 2,974 BSIs). Br J Sports Med, 2023. doi:10.1136/bjsports-2022-106328
- Cook & Purdam. Is tendon pathology a continuum? Br J Sports Med, 2009. doi:10.1136/bjsm.2008.051193
- Robertson & Wood. Lower-limb stress fractures in sport. World J Orthop, 2017. pmc.ncbi.nlm.nih.gov/PMC5359760
- StatPearls. Stress reaction and fractures (high- vs low-risk sites). ncbi.nlm.nih.gov/books/NBK507835
Recovery & rehabilitation
- Beyer et al. Heavy-slow-resistance vs eccentric for Achilles tendinopathy. Am J Sports Med, 2015. pubmed.ncbi.nlm.nih.gov/26018970
- de Vos et al. PRP vs saline for chronic Achilles tendinopathy. JAMA, 2010. pubmed.ncbi.nlm.nih.gov/20068208
- Clifford et al. Isometric exercise for tendinopathy (meta-analysis). 2020. pmc.ncbi.nlm.nih.gov/PMC7406028
- Criteria for returning to running after tibial bone stress injury (scoping review). 2024. pmc.ncbi.nlm.nih.gov/PMC11393297
- Mechanical loading in tendon development, injury & repair. PMC3748997. pmc.ncbi.nlm.nih.gov/PMC3748997
Biomechanics, gait & footwear
- Zadpoor & Nikooyan. Ground-reaction force & lower-extremity stress fractures (meta-analysis). Clin Biomech, 2011. pubmed.ncbi.nlm.nih.gov/20846765
- Ridge et al. Foot bone-marrow oedema after transition to minimalist shoes. Med Sci Sports Exerc, 2013. pubmed.ncbi.nlm.nih.gov/23439417
- Malisoux et al. Shoe cushioning & injury risk by body mass (RCT). Am J Sports Med, 2020. doi:10.1177/0363546519892578
- Lavigne et al. Footwear/orthoses & prevention of bone stress injuries (meta-analysis). 2023. pmc.ncbi.nlm.nih.gov/PMC10464778
- Doyle et al. Gait retraining (meta-analysis). JOSPT, 2022. jospt.org/doi/10.2519/jospt.2022.10585
- Voloshina & Ferris. Running on uneven terrain. J Exp Biol, 2015. journals.biologists.com · jeb 218/5/711
Nutrition & the metabolic/ancestral lens
- Shaw et al. (Baar lab). Vitamin-C-enriched gelatin before loading augments collagen synthesis. Am J Clin Nutr, 2017. pmc.ncbi.nlm.nih.gov/PMC5183725
- Praet et al. Collagen peptides + rehab for Achilles tendinopathy. 2019. pmc.ncbi.nlm.nih.gov/PMC6356409
- Heikura, Burke et al. Short-term ketogenic diet impairs bone-health markers in athletes. Front Endocrinol, 2019. pmc.ncbi.nlm.nih.gov/PMC6985427
- Hall et al. Ultra-processed diets cause excess intake (inpatient RCT). Cell Metab, 2019. cell.com · S1550-4131(19)30248-7
- Hooper et al. (Cochrane). Omega-6 fats & mortality. 2018. pmc.ncbi.nlm.nih.gov/PMC6516799
- Marklund et al. Linoleic acid biomarkers & cardiovascular/mortality (38 cohorts). 2020. pubmed.ncbi.nlm.nih.gov/32020162
- Rønn et al. MK-7 (vitamin K2) & bone (3-yr RCT). 2020. pubmed.ncbi.nlm.nih.gov/33030563
- Vitamin C & musculoskeletal-injury healing (systematic review). 2018. pmc.ncbi.nlm.nih.gov/PMC6204628
- Very-low-carb (all-animal) diet nutrient modelling (gaps in vitamin C, magnesium, calcium, fibre). 2025. pubmed.ncbi.nlm.nih.gov/39796574
Environmental factors
- Narbutaitė, Vehkalahti, Milčiuvienė. Dental fluorosis in high- vs low-fluoride areas of Lithuania (Klaipėda 1.7–2.2 ppm). Eur J Oral Sci, 2007. pubmed.ncbi.nlm.nih.gov/17451504
- Fluoride exposure, bone density & fracture risk (dose-response meta-analysis, 37 studies). Environ Health, 2025. doi:10.1186/s12940-025-01226-y
- EFSA. Updated fluoride risk assessment. 2025. efsa.onlinelibrary.wiley.com · 2025.9478
- Coffee/tea intake & bone density / hip fracture (meta-analysis). 2023. pmc.ncbi.nlm.nih.gov/PMC10301353
- Microplastics & the musculoskeletal system (narrative review). 2024. pmc.ncbi.nlm.nih.gov/PMC11775366
Psychology of forced rest
- Park et al. Athletic identity & depression after injury (systematic review). 2023. pmc.ncbi.nlm.nih.gov/PMC10188729
- Timme et al. Forced reduction in exercise & mood in exercise dependence. 2022. pmc.ncbi.nlm.nih.gov/PMC8877743
- Desai et al. "Dopamine fasting," a literature review. 2024. pmc.ncbi.nlm.nih.gov/PMC11223451
- RED-S in the female athlete (clinical review). PMC9724109, 2022. pmc.ncbi.nlm.nih.gov/PMC9724109
Evidence labels reflect the quality of the underlying studies, not certainty about any individual. Where a source could only be seen as a search summary rather than full text, that was tracked in the working notes, and such figures are treated as indicative. No sources, authors, journals, statistics, or links were fabricated.
Independent evidence review · built June 2026 · not medical advice · for discussion with qualified clinicians.