Place · Level 3 · Lab Literacy
Blood work decoded · routine chemistry
血脂 + 血糖/胰岛素/HOMA-IR + 肝酶 + 肾功 · 箭头意味着什么 · 营养干预方向 · 何时必须就医
Last updated
Story path
- 1Arrows are not verdictsArrows are not verdicts
- 2Lipids · count particlesLipids · count particles
- 3Glucose + insulin · HOMA-IRGlucose + insulin · HOMA-IR
- 4Liver enzymes · the liver's cryLiver enzymes · the liver's cry
- 5Kidney + uric acid · filter statusKidney + uric acid · filter status
- 6The convergence · one upstreamThe convergence · one upstream
- 7Red flags · urgent careRed flags · urgent care
- 8Nutrition · not a replacementNutrition · not a replacement
Chapter 1
Arrows are not verdicts
Arrows are not verdicts
The easiest mistake when a lab report lands in your hands is panicking at a single arrow. Three ground truths first.
1. Reference range is not healthy range. The 'normal interval' printed on the sheet is usually the central 95% of the population that lab has measured — it describes 'most people', not 'the healthiest people'. And most people's metabolism is not in great shape.
2. A single arrow says little; the pattern is what matters. Triglycerides slightly up + good cholesterol slightly down + liver enzymes slightly up + uric acid up + fasting insulin high — each alone 'isn't disease', but together they point to one upstream driver: insulin resistance. That convergence is more diagnostic than any single marker.
3. Trends beat snapshots. One draw is affected by sleep, stress, recent meals, menstrual phase, medications. Same-lab, same-fasting-condition trends are far more reliable than an isolated value.
This island covers routine chemistry in four panels: lipids, glucose metabolism, liver enzymes, kidney + uric acid. Reference values and interpretation tables sit on the depth pages; the first screen is mechanism only.
1. Reference range is not healthy range. The 'normal interval' printed on the sheet is usually the central 95% of the population that lab has measured — it describes 'most people', not 'the healthiest people'. And most people's metabolism is not in great shape.
2. A single arrow says little; the pattern is what matters. Triglycerides slightly up + good cholesterol slightly down + liver enzymes slightly up + uric acid up + fasting insulin high — each alone 'isn't disease', but together they point to one upstream driver: insulin resistance. That convergence is more diagnostic than any single marker.
3. Trends beat snapshots. One draw is affected by sleep, stress, recent meals, menstrual phase, medications. Same-lab, same-fasting-condition trends are far more reliable than an isolated value.
This island covers routine chemistry in four panels: lipids, glucose metabolism, liver enzymes, kidney + uric acid. Reference values and interpretation tables sit on the depth pages; the first screen is mechanism only.
Where a reference range comes from
Fasting insulin is the classic trap: many labs list 2–25 µU/mL as normal, but metabolically healthy adults cluster at 2–8. A value of 18 sits inside the reference range yet can signal clear insulin resistance.The reason is arithmetic. A reference interval lines up everyone that lab has measured, trims the lowest 2.5% and the highest 2.5%, and calls the middle 95% 'normal'. It describes what this population currently looks like, not what health should look like. When a sizeable share of that population is itself insulin-resistant, they stretch the upper bound wide.
So every panel below gives two numbers: the reference value (what the lab prints) and the optimal value (where metabolically healthy people sit). When they disagree, use the second.
The four panels on this island: lipids, glucose metabolism, liver enzymes, kidney + uric acid. For each: reference vs optimal values, what an arrow means, what nutrition can do, and when to seek medical care. The final scene ties all arrows into the convergence pattern — you'll see they are often different faces of the same problem.
Chapter 2
Lipids · count particles
Lipids · count particles
Cholesterol doesn't dissolve in water, and blood is water. So it cannot drift through blood on its own — it has to be packed into little spheres called lipoproteins and carried. The LDL, HDL and TG lines on your panel are really measuring those spheres and their cargo.
Here's what matters: what lodges in the artery wall is the sphere itself, not the cargo. Every atherogenic particle carries one apolipoprotein B: One sits on every artery-clogging particle, so counting it counts the harmful particles directly. protein on its surface — one per particle. A particle burrows under the endothelium, gets stuck, is swallowed by immune cells, and that is how plaque forms. So the thing worth counting is how many particles there are.
This is why low-density lipoprotein cholesterol: The so-called 'bad cholesterol' — the higher it is, the more plaque tends to build in artery walls. can mislead. The same amount of cholesterol can ride in a few large particles or in many small dense ones. The second case means more particles and more risk, and the LDL-C number cannot tell them apart. People with high triglycerides, diabetes or obesity are especially prone to this mismatch — for them ApoB is more accurate than LDL-C.
When to see a doctor: LDL-C ≥ 4.9 mmol/L (190 mg/dL) → screen for familial hypercholesterolemia; TG > 5.6 mmol/L (500 mg/dL) → pancreatitis risk; established CVD with LDL above target → medication adjustment.
Here's what matters: what lodges in the artery wall is the sphere itself, not the cargo. Every atherogenic particle carries one apolipoprotein B: One sits on every artery-clogging particle, so counting it counts the harmful particles directly. protein on its surface — one per particle. A particle burrows under the endothelium, gets stuck, is swallowed by immune cells, and that is how plaque forms. So the thing worth counting is how many particles there are.
This is why low-density lipoprotein cholesterol: The so-called 'bad cholesterol' — the higher it is, the more plaque tends to build in artery walls. can mislead. The same amount of cholesterol can ride in a few large particles or in many small dense ones. The second case means more particles and more risk, and the LDL-C number cannot tell them apart. People with high triglycerides, diabetes or obesity are especially prone to this mismatch — for them ApoB is more accurate than LDL-C.
When to see a doctor: LDL-C ≥ 4.9 mmol/L (190 mg/dL) → screen for familial hypercholesterolemia; TG > 5.6 mmol/L (500 mg/dL) → pancreatitis risk; established CVD with LDL above target → medication adjustment.
The lipid panel, line by line
TC (total cholesterol): < 5.2 mmol/L (200 mg/dL) desirable. Least informative — lumps good and bad together.low-density lipoprotein cholesterol: The so-called 'bad cholesterol' — the higher it is, the more plaque tends to build in artery walls.: treatment target, but interpretation depends on risk tier. Low < 3.0 / moderate < 2.6 / high < 1.8 / very high < 1.4 mmol/L. The same 3.5 means different things in a healthy 30-year-old vs a post-MI patient.high-density lipoprotein cholesterol: The so-called 'good cholesterol' — it helps ferry excess cholesterol back to the liver.: men > 1.0, women > 1.3 mmol/L (40/50 mg/dL). But HDL-raising drugs (torcetrapib) did not reduce events — HDL is more a marker than a cause. Low HDL + high TG is the classic insulin-resistance signature.TG (triglycerides): < 1.7 mmol/L (150 mg/dL); > 5.6 (500 mg/dL) pancreatitis risk. TG is one of the most sensitive metabolic markers — it reflects hepatic insulin response.non-HDL-C = TC − HDL-C: all atherogenic particles; target ~0.8 mmol/L (30 mg/dL) above LDL-C goal.apolipoprotein B: One sits on every artery-clogging particle, so counting it counts the harmful particles directly.: direct count of atherogenic particles (one ApoB per particle). < 90 mg/dL low, 90–109 borderline, ≥ 110 high. More accurate than LDL-C in high-TG / diabetes / obesity.lipoprotein(a): A largely gene-set lipoprotein particle that independently raises cardiovascular risk.: > 50 mg/dL (125 nmol/L) elevated. Genetically determined, barely modifiable by diet/exercise; measure once in a lifetime. Independent CVD and aortic stenosis risk.Nutrition levers: replace saturated with unsaturated fat (LDL down ~10%), soluble fiber 5–10 g/day (oats/legumes), plant sterols 2 g/day, weight loss 5–10% (TG down 20–30%), limit sugar/fructose/alcohol (TG drops fastest), prescription EPA 2–4 g/day (TG down 25–40%). Realistic LDL change from diet: ~10–15%. See the atlas dyslipidemia island for the deep dive.
TG/HDL ratio · free insulin-resistance screen
If your panel only has the standard four (TC/LDL/HDL/TG) without insulin or apolipoprotein B: One sits on every artery-clogging particle, so counting it counts the harmful particles directly., there is a free surrogate: the TG/HDL ratio.Calculate: TG (mg/dL) divided by high-density lipoprotein cholesterol: The so-called 'good cholesterol' — it helps ferry excess cholesterol back to the liver. (mg/dL). If using mmol/L: TG (mmol/L) / HDL-C (mmol/L) x 0.437.
Men > 2.8, women > 2.53 → suggests insulin resistanceValidated against HOMA-IR in a PRISMA review of 32 studies (~50,000 participants)Also predicts small-dense LDL (sdLDL) predominance — more atherogenic particles
Caveat: less reliable in people of African descent (often low TG despite IR); Asian cutoffs may be lower.
So next time you read a report, calculate TG/HDL first — if high, even with normal LDL, it is worth checking fasting insulin and HOMA-IR.
Chapter 3
Glucose + insulin · HOMA-IR
Glucose + insulin · HOMA-IR
Glucose is the last thing to go wrong. Grasping this can save you a decade.
You eat carbohydrate, blood glucose rises, the pancreas releases insulin, and insulin travels to the doors of muscle and fat cells telling them to open up and take the sugar in. The trouble starts when those cells begin playing deaf: the same amount of insulin knocks, and fewer doors open.
The pancreas doesn't concede — it turns up the volume, secreting more insulin and forcing glucose back into the normal range. That compensation can run 5–15 years. Throughout it, your fasting glucose reads perfectly normal while fasting insulin has quietly climbed.
So checking glucose without insulin is a smoke alarm that only goes off once the house is already burning. HOMA-IR, which combines the two numbers, is the one thing visible during that compensation window (formula and tiers on the depth page).
When to see a doctor: fasting glucose ≥ 7.0 or HbA1c ≥ 6.5% → diabetes diagnosis; fasting glucose 100–125 or HbA1c 5.7–6.4% → prediabetes, consider 75 g OGTT; HOMA-IR > 3.0 + waist circumference men > 90 cm / women > 80 cm → metabolic syndrome evaluation.
You eat carbohydrate, blood glucose rises, the pancreas releases insulin, and insulin travels to the doors of muscle and fat cells telling them to open up and take the sugar in. The trouble starts when those cells begin playing deaf: the same amount of insulin knocks, and fewer doors open.
The pancreas doesn't concede — it turns up the volume, secreting more insulin and forcing glucose back into the normal range. That compensation can run 5–15 years. Throughout it, your fasting glucose reads perfectly normal while fasting insulin has quietly climbed.
So checking glucose without insulin is a smoke alarm that only goes off once the house is already burning. HOMA-IR, which combines the two numbers, is the one thing visible during that compensation window (formula and tiers on the depth page).
When to see a doctor: fasting glucose ≥ 7.0 or HbA1c ≥ 6.5% → diabetes diagnosis; fasting glucose 100–125 or HbA1c 5.7–6.4% → prediabetes, consider 75 g OGTT; HOMA-IR > 3.0 + waist circumference men > 90 cm / women > 80 cm → metabolic syndrome evaluation.
Values, HOMA-IR tiers, nutrition levers
Fasting glucose: 3.9–5.5 mmol/L (70–99 mg/dL) normal; 5.6–6.9 (100–125) prediabetes; ≥ 7.0 (126) diabetes.Fasting insulin: the earliest mover. Ideal 2–8 µU/mL. Many labs list up to 25 as normal because their reference population is itself insulin-resistant. Insulin > 10–12 warrants attention, especially with elevated TG.
HOMA-IR = insulin (µU/mL) × glucose (mg/dL) ÷ 405 (or ÷ 22.5 if using mmol/L):
< 1.0: optimal insulin sensitivity1.0–1.9: early resistance — time to act2.0–2.9: established insulin resistance≥ 3.0: significant; prediabetes/diabetes risk elevated≥ 5.0: severe; clinical evaluation needed
Chinese and South Asian populations develop metabolic complications at lower HOMA-IR (1.4–1.78).
HbA1c: reflects average glucose over 2–3 months. < 5.7% normal; 5.7–6.4% prediabetes; ≥ 6.5% diabetes. Caveat: iron-deficiency anemia falsely elevates HbA1c; hemolysis/blood loss falsely lowers it.
Nutrition levers: reduce refined carbs and added sugar; eat protein and vegetables before carbs at meals (food-order effect: postprandial glucose down ~30–40%); resistance training (the single most effective insulin sensitizer); post-meal walks 10–15 min; 7–9 h sleep; weight loss 5–10%. Time-restricted eating (14–16 h overnight fast) has adjunct evidence. Berberine 500 mg TID has RCT evidence improving HOMA-IR, but it is an adjunct, not a replacement for lifestyle.
Athlete caveat: after heavy training, fasting glucose can be mildly elevated (100–110 mg/dL) as a physiological hepatic glucose output response; if fasting insulin stays low (2–4) and HOMA-IR < 1.0, this is not prediabetes.
Why normal glucose does not equal normal metabolism
The pancreas is a compensating organ. When muscle, liver, and fat cells start ignoring insulin, β-cells respond by secreting more insulin — forcing glucose back into the normal range.This compensation phase can last 5–15 years. During it:
Fasting glucose stays perfectly normal (90–99 mg/dL)HbA1c stays perfectly normal (< 5.5%)But fasting insulin is already 12–18 µU/mLHOMA-IR is already 2.5–4.0TG creeps up, HDL drifts down, ALT mildly elevated, uric acid rising, waist expanding
This is why checking glucose alone misses the majority of early metabolic dysfunction. A routine physical that checks only fasting glucose is a smoke alarm that goes off only when the house is already on fire.
Typical example: fasting glucose 92 mg/dL (perfectly normal) + fasting insulin 15 µU/mL = HOMA-IR 3.4 (clear insulin resistance). A doctor looking only at glucose says 'you're fine,' but metabolism is already declining.
This is why this project places HOMA-IR and TG/HDL ratio at the center — they signal trouble 5–15 years before glucose moves.
Chapter 4
Liver enzymes · the liver's cry
Liver enzymes · the liver's cry
The enzymes on a 'liver function' panel are not liver function itself — they are what leaks out when liver cells are injured. Grasp that and it becomes clear why mildly elevated ALT/AST is not hepatitis.
Picture a liver cell as a bag full of enzymes. While the cell is intact the enzymes stay inside; when the cell is stretched, poisoned, or stuffed with fat, the bag seeps and the enzymes escape into blood. So more enzyme in blood means more cells are currently leaking, not that the liver's capacity to work has fallen.
What actually reports the liver's capacity is what it builds (albumin, clotting factors) and what it clears (bilirubin). This is also why someone with advanced cirrhosis can have unremarkable transaminases — there aren't many cells left to leak.
The commonest answer to a mild elevation is not viral hepatitis but fatty liver: hepatocytes swollen with triglyceride seep more easily. So these lines are often downstream of the previous panel (glucose metabolism).
When to see a doctor: ALT/AST > 1000; jaundice (yellow eyes/skin); ascites or stigmata of chronic liver disease; known liver disease with dropping albumin or rising bilirubin.
Picture a liver cell as a bag full of enzymes. While the cell is intact the enzymes stay inside; when the cell is stretched, poisoned, or stuffed with fat, the bag seeps and the enzymes escape into blood. So more enzyme in blood means more cells are currently leaking, not that the liver's capacity to work has fallen.
What actually reports the liver's capacity is what it builds (albumin, clotting factors) and what it clears (bilirubin). This is also why someone with advanced cirrhosis can have unremarkable transaminases — there aren't many cells left to leak.
The commonest answer to a mild elevation is not viral hepatitis but fatty liver: hepatocytes swollen with triglyceride seep more easily. So these lines are often downstream of the previous panel (glucose metabolism).
When to see a doctor: ALT/AST > 1000; jaundice (yellow eyes/skin); ascites or stigmata of chronic liver disease; known liver disease with dropping albumin or rising bilirubin.
Enzyme by enzyme · reference values
ALT (alanine transaminase): most liver-specific. Lab range men 7–56, women 7–30 U/L, but metabolically, men > 35 / women > 25 warrants attention — often the earliest sign of NAFLD. ALT > 1000 suggests acute liver injury (viral/drug/ischemic) → emergency.AST (aspartate transaminase): found in liver, heart, muscle, RBCs. AST/ALT ratio > 2:1 suggests alcoholic liver disease; isolated AST elevation with normal ALT → consider muscle injury (e.g., post-heavy-lifting) or cardiac source.
GGT (gamma-glutamyl transferase): biliary and alcohol-related. Men 0–71, women 6–42 U/L. Most common causes of elevated GGT: alcohol (even modest amounts), fatty liver, biliary disease. Also an independent predictor of metabolic syndrome.
ALP (alkaline phosphatase): biliary and bone. 44–147 U/L. ALP + GGT both elevated → biliary; isolated ALP → consider bone turnover (children/pregnancy/bone disease).
Bilirubin: total 0.1–1.2 mg/dL (2–20 µmol/L). 1.2–3.0 with predominantly unconjugated bilirubin and otherwise normal enzymes → likely Gilbert syndrome (benign, ~5% of population). > 3.0 mg/dL = jaundice → investigate.
Albumin: 3.5–5.5 g/dL. Reflects hepatic synthetic function and nutritional status. Low albumin = impaired hepatic synthesis (advanced liver disease), malnutrition, or nephrotic loss.
What nutrition can do
If ALT/AST/GGT are mildly elevated alongside metabolic syndrome features, NAFLD is the most likely answer. Weight loss of 7–10% is the most effective intervention (Vilar-Gomez 2015 RCT: ≥ 10% weight loss → 90% fibrosis improvement). Limit fructose (especially sugary drinks), limit alcohol, Mediterranean pattern, aerobic + resistance training.The Cochrane review of milk thistle shows no significant effect on liver mortality or complications.
Chapter 5
Kidney + uric acid · filter status
Kidney + uric acid · filter status
The kidney is the body's filter. Plasma is pushed through an extremely fine mesh; waste stays behind and heads for the urine, and what's useful gets reabsorbed. Kidney tests ask whether that mesh still works.
Creatinine is the waste your muscles produce daily, cleared almost entirely by the kidney. So a high creatinine has two possible readings: the mesh is failing, or this person simply has a lot of muscle. Someone who squats 170 kg can run high creatinine with entirely normal kidney function — which is why creatinine alone is insufficient, and why you read the eGFR calculated from it, interpreted alongside body build.
Uric acid is often treated as a gout-only line, but it doubles as a metabolic probe: insulin resistance reduces renal urate excretion, so serum uric acid rises. High uric acid + high triglycerides + low good cholesterol + mildly elevated liver enzymes is another face of metabolic syndrome.
When to see a doctor: eGFR < 60 for 3+ months; eGFR < 30 (nephrology); acute creatinine rise; hyperkalemia (K > 6.0); acute gout flare (red, hot, swollen joint).
Creatinine is the waste your muscles produce daily, cleared almost entirely by the kidney. So a high creatinine has two possible readings: the mesh is failing, or this person simply has a lot of muscle. Someone who squats 170 kg can run high creatinine with entirely normal kidney function — which is why creatinine alone is insufficient, and why you read the eGFR calculated from it, interpreted alongside body build.
Uric acid is often treated as a gout-only line, but it doubles as a metabolic probe: insulin resistance reduces renal urate excretion, so serum uric acid rises. High uric acid + high triglycerides + low good cholesterol + mildly elevated liver enzymes is another face of metabolic syndrome.
When to see a doctor: eGFR < 60 for 3+ months; eGFR < 30 (nephrology); acute creatinine rise; hyperkalemia (K > 6.0); acute gout flare (red, hot, swollen joint).
Reference values and CKD staging
Creatinine: men 0.7–1.3, women 0.6–1.1 mg/dL (62–115 / 53–97 µmol/L). Creatinine is a muscle metabolite excreted by the kidneys. Muscular individuals can have elevated creatinine with perfectly normal kidney function.eGFR (estimated GFR): calculated from creatinine, age, sex, race using the CKD-EPI equation. ≥ 90 normal; 60–89 G2; 45–59 G3a; 30–44 G3b; 15–29 G4; < 15 G5 (kidney failure). eGFR < 60 for 3+ months = CKD. After 40, eGFR naturally declines ~10 per decade — normal aging.
BUN: 7–20 mg/dL. Elevated = dehydration, high protein intake, or renal failure. BUN/creatinine ratio > 20 suggests dehydration (prerenal).
Uric acid: men 3.7–8.6, women 2.4–6.0 mg/dL (220–420 / 150–360 µmol/L). > 7 mg/dL gout risk rises. But uric acid is not just about gout — it is directly linked to insulin resistance: IR reduces renal urate excretion, raising serum uric acid.
What nutrition can do
Normal kidney function: high protein does NOT damage kidneys (common myth); stay hydratedCKD G3+: protein restriction (0.8 g/kg/day), potassium/phosphorus/sodium restriction under dietitian guidanceHigh uric acid/gout: limit alcohol (especially beer and spirits), limit fructose, limit high-purine foods (organ meats, rich broths, some seafood), weight loss (but avoid rapid weight loss → ketosis suppresses urate excretion), hydration, cherries/dairy may help adjunctively. Vitamin C 500 mg/day may modestly lower uric acid (~0.5 mg/dL)Chapter 6
The convergence · one upstream
The convergence · one upstream
Now look at all the arrows together.
Lipids, glucose, liver enzymes, uric acid, blood pressure, waist — these markers don't know about each other. Different assays, different methods, measured in different tissues, printed in different sections of the report. Yet they move together, because they share one upstream driver: insulin resistance.
Trace it step by step. Under insulin resistance the liver keeps pushing triglyceride into the blood → TG up, good cholesterol down; the liver stores fat itself → enzymes leak; the kidney reabsorbs more urate → uric acid up; insulin promotes sodium retention → blood pressure up; insulin drives visceral fat storage → waist up.
This is why:
1. Don't anxiety-spiral over individual arrows — they are one problem
2. Don't supplement one-by-one — improve insulin sensitivity and all arrows improve together
3. Resistance training + refined carb reduction + 5–10% weight loss + sleep are the levers that move all these markers simultaneously
The strongest evidence is not any single study but this convergence argument: independent measurements consistently co-vary because they are driven by the same root cause.
Lipids, glucose, liver enzymes, uric acid, blood pressure, waist — these markers don't know about each other. Different assays, different methods, measured in different tissues, printed in different sections of the report. Yet they move together, because they share one upstream driver: insulin resistance.
Trace it step by step. Under insulin resistance the liver keeps pushing triglyceride into the blood → TG up, good cholesterol down; the liver stores fat itself → enzymes leak; the kidney reabsorbs more urate → uric acid up; insulin promotes sodium retention → blood pressure up; insulin drives visceral fat storage → waist up.
This is why:
1. Don't anxiety-spiral over individual arrows — they are one problem
2. Don't supplement one-by-one — improve insulin sensitivity and all arrows improve together
3. Resistance training + refined carb reduction + 5–10% weight loss + sleep are the levers that move all these markers simultaneously
The strongest evidence is not any single study but this convergence argument: independent measurements consistently co-vary because they are driven by the same root cause.
Which values, together, make the pattern
If your report shows these simultaneously:TG elevated (> 1.7 mmol/L)HDL low (men < 1.0 / women < 1.3)ALT mildly elevated (men > 35 / women > 25)Uric acid elevated (> 7 mg/dL)Fasting insulin high (> 10) / HOMA-IR > 2.0Blood pressure elevated (≥ 130/85)Waist circumference men > 90 cm / women > 80 cm
…then this is one cluster, not seven problems.
One more that often gets missed: hyperinsulinemia suppresses hepatic SHBG synthesis → SHBG down, which in turn changes how sex hormones read (next island).
Chapter 7
Red flags · urgent care
Red flags · urgent care
The following values are not 'adjust your lifestyle' territory — they require prompt (in some cases immediate) medical attention:
Emergency (same day):
Glucose > 16.7 mmol/L (300 mg/dL), especially with thirst, polyuria, confusion → possible DKA or hyperosmolar statePotassium < 3.0 or > 6.0 mmol/L → arrhythmia riskSodium < 125 or > 155 mmol/L → cerebral edema or severe dehydrationALT/AST > 1000 U/L → acute liver injuryHemoglobin < 7 g/dL → severe anemiaPlatelets < 50,000/µL → bleeding risk
The prompt (within 1–2 weeks) tier is listed on the next page.
Emergency (same day):
Glucose > 16.7 mmol/L (300 mg/dL), especially with thirst, polyuria, confusion → possible DKA or hyperosmolar statePotassium < 3.0 or > 6.0 mmol/L → arrhythmia riskSodium < 125 or > 155 mmol/L → cerebral edema or severe dehydrationALT/AST > 1000 U/L → acute liver injuryHemoglobin < 7 g/dL → severe anemiaPlatelets < 50,000/µL → bleeding risk
The prompt (within 1–2 weeks) tier is listed on the next page.
Prompt (within 1–2 weeks) · the list
This tier does not mean the emergency department today, but it does not mean 'wait for the next annual check' either — book an appointment and bring the report.Prompt (within 1–2 weeks):
eGFR < 30Creatinine > 4.0 mg/dL (354 µmol/L)low-density lipoprotein cholesterol: The so-called 'bad cholesterol' — the higher it is, the more plaque tends to build in artery walls. ≥ 4.9 mmol/L (190 mg/dL) → screen for FHTG > 5.6 mmol/L (500 mg/dL) → pancreatitis riskFasting glucose ≥ 7.0 or HbA1c ≥ 6.5% → diabetes diagnosisthyroid-stimulating hormone: A pituitary hormone that prods the thyroid to work — it rises when the thyroid is underactive. > 20 or < 0.01 (next island)Albumin < 3.0 g/dL or decliningBilirubin > 3.0 mg/dL (jaundice)
Monitor, don't panic · disclaimer
Monitor, don't panic:Single mild abnormality (ALT 40, uric acid 7.5, TG 1.8) → 3–6 months lifestyle intervention first, then recheckArrow within reference range but near upper limit → interpret in pattern context, not isolation
Disclaimer: This island provides health literacy education, not medical diagnosis. Any treatment decisions (medication, discontinuation, supplements) should be discussed with your physician. This project does not replace clinical consultation.
Chapter 8
Nutrition · not a replacement
Nutrition · not a replacement
Finally, what nutrition can and cannot do. The 'can' half — and how large each effect realistically is — sits on the depth page; this screen leads with the 'cannot', because treating food as a drug is where the harm lives.
Nutrition cannot:
Replace statins for high/very-high-risk low-density lipoprotein cholesterol: The so-called 'bad cholesterol' — the higher it is, the more plaque tends to build in artery walls. (diet lowers 10–15%; targets may require 50%+ reduction)Replace hypoglycemics/insulin for established diabetesCure CKD — it cannot (but proper nutrition can slow progression)Dissolve existing plaque (but can stabilize plaque and slow progression)Replace urate-lowering therapy for recurrent gout
Right mindset: nutrition is the foundation; medication is the scaffolding. The stronger the foundation, the less scaffolding needed — but when scaffolding is indicated, don't try to hold the building up with foundation alone.
The next island covers specialized markers: thyroid, sex hormones, 25-hydroxyvitamin D: The storage form of vitamin D in blood — the number measured to check D status., ferritin, homocysteine, hs-C-reactive protein: A liver protein that rises with inflammation — a common blood marker for 'is the body inflamed'..
Nutrition cannot:
Replace statins for high/very-high-risk low-density lipoprotein cholesterol: The so-called 'bad cholesterol' — the higher it is, the more plaque tends to build in artery walls. (diet lowers 10–15%; targets may require 50%+ reduction)Replace hypoglycemics/insulin for established diabetesCure CKD — it cannot (but proper nutrition can slow progression)Dissolve existing plaque (but can stabilize plaque and slow progression)Replace urate-lowering therapy for recurrent gout
Right mindset: nutrition is the foundation; medication is the scaffolding. The stronger the foundation, the less scaffolding needed — but when scaffolding is indicated, don't try to hold the building up with foundation alone.
The next island covers specialized markers: thyroid, sex hormones, 25-hydroxyvitamin D: The storage form of vitamin D in blood — the number measured to check D status., ferritin, homocysteine, hs-C-reactive protein: A liver protein that rises with inflammation — a common blood marker for 'is the body inflamed'..
What nutrition can do, and by how much
Nutrition can:Improve insulin sensitivity (reduce refined carbs, resistance training, weight loss, sleep) → simultaneously improves TG/HDL/ALT/uric acid/HOMA-IRLower low-density lipoprotein cholesterol: The so-called 'bad cholesterol' — the higher it is, the more plaque tends to build in artery walls. 10–15% (saturated fat replacement, fiber, plant sterols)Lower TG 20–40% (sugar/alcohol restriction, weight loss, fish oil)Lower BP (DASH pattern, sodium restriction, weight loss, exercise)Reduce gout flare frequency (fructose/alcohol restriction, weight loss, hydration)Support hepatic fat reversal (7–10% weight loss is the most effective NAFLD intervention)
Note the magnitude after each line: they are all real, and none of them is drug-scale.
References · 16
- Matthews, D. R., Hosker, J. P., Rudenski, A. S., Naylor, B. A., Treacher, D. F., & Turner, R. C. (1985). Homeostasis model assessment: insulin resistance and beta-cell function from fasting plasma glucose and insulin concentrations in man. Diabetologia, 28(7), 412-419. Original HOMA model from Oxford; HOMA-IR = insulin (µU/mL) × glucose (mM) / 22.5. 10.1007/BF00280883
- Gayoso-Diz, P., Otero-Gonzalez, A., Rodriguez-Alvarez, M. X., Gude, F., Cadarso-Suarez, C., Garcia, F., & de Francisco, A. (2013). Insulin resistance (HOMA-IR) cut-off values and the metabolic syndrome in a general adult population: effect of gender and age: EPIRCE cross-sectional study. BMC Endocrine Disorders, 13, 47. n=2,459 Spanish adults; HOMA-IR cutoffs for cardiometabolic risk vary by age/gender; range 1.5–3.0 for clinically meaningful IR. 10.1186/1472-6823-13-47
- Mach, F., Baigent, C., Catapano, A. L., Koskinas, K. C., Casula, M., Badimon, L., et al. (2020). 2019 ESC/EAS guidelines for the management of dyslipidaemias. European Heart Journal, 41(1), 111-188. 10.1093/eurheartj/ehz455
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