Bettering Me

Tag: insulin resistance

  • Your HbA1c Can Be 5.2 While Your Pancreas Is Running a Marathon Every Day. Catch the Signal Before the Metric Breaks

    Written by

    Unpaid Intern

    –

    A hemoglobin A1c of 5.2% is considered excellent by clinical standards. Normal glucose. Low diabetes risk. Pass the physical. Your doctor tells you everything looks great, come back in a year. The problem is that HbA1c and fasting glucose are late-stage indicators – they measure the outcome of compensation, not the compensation itself. By the time these metrics break, the compensatory mechanism has been failing silently for years.

    To understand why, you have to understand what the pancreatic beta cell does when insulin sensitivity declines. When muscle and fat cells become less responsive to insulin, glucose remains in the bloodstream instead of being cleared into tissues. The beta cell responds by secreting more insulin – sometimes two to three times the normal amount – to force the glucose into cells [1]. This is the compensatory phase. Glucose remains normal because insulin is elevated. The system looks healthy from the outside because the beta cell is doing heroic work. But that heroism is not sustainable.

    By the time fasting glucose crosses 100 mg/dL or HbA1c exceeds 5.7%, the beta cells have been operating at elevated output for years, and some have already begun to fail. The metric breaks only when the compensatory mechanism exhausts.

    The real metric is fasting insulin.

    Fasting insulin above 10 µIU/mL in the context of a “normal” glucose means your pancreas is secreting excess insulin to overcome reduced sensitivity. The HOMA-IR calculation – (glucose × insulin) ÷ 405 – transforms this into a single number. A HOMA-IR above 2.0 signals that your body needs more insulin than it should to maintain normal glucose [2]. Above 2.5, you are meaningfully insulin resistant, even if every glycemic metric in your chart is pristine.

    The glucose looks fine because the insulin is doing triple shifts. This is not a healthy state. It is a compensated state, and compensation eventually fails.

    The fix at this stage is not medication – it is the sequence of carbohydrate intake, muscle glucose disposal capacity, and the overnight fast window length. These three levers address the root cause of the insulin demand without restricting your diet or adding complexity.

    Carbohydrate sequencing – moving starches and sugars to the end of the meal, after protein, fiber, and vegetables – reduces the postprandial glucose spike by slowing gastric emptying and blunting the insulin demand [3]. This is not a different diet. It is a different order of the same food. A meal of grilled chicken, broccoli, and sweet potato produces a smaller glucose excursion when eaten in that sequence (protein first, vegetables second, starch last) than when the starch is eaten first. The mechanism is mechanical – fiber and protein slow gastric emptying, which delays and attenuates the glucose absorption curve.

    Muscle glucose disposal is the largest glucose sink in the body. Skeletal muscle accounts for approximately 70-80% of insulin-mediated glucose uptake. Resistance training increases GLUT4 translocation – the mechanism by which muscle cells pull glucose out of the bloodstream – and this effect is independent of insulin [4]. A single resistance session increases muscle glucose uptake capacity for 24-48 hours. Two sessions per week functionally increase your glucose storage capacity by expanding the muscle mass available to absorb it. This is why resistance training is a more effective metabolic intervention than carbohydrate restriction for most people.

    The overnight fast window – 12 hours between dinner and breakfast – allows insulin to return to baseline and restores hepatic insulin sensitivity [5]. This is not intermittent fasting for weight loss. It is a metabolic reset window that costs nothing. The 12-hour window is achievable by anyone who finishes dinner by 7 PM and has breakfast after 7 AM. Extending to 14 hours provides additional benefit, but 12 hours is the evidence-based minimum for allowing insulin to clear and hepatic glucose production to reset.

    Counterpoint: what if fasting insulin is normal but postprandial glucose spikes high? This is a legitimate concern, particularly for certain metabolic phenotypes. Normal fasting insulin with high postprandial excursions may indicate impaired early-phase insulin secretion or reduced incretin signaling. A 75g oral glucose tolerance test with insulin measurements at 0, 60, and 120 minutes provides more resolution than fasting values alone. If this pattern applies to you, the carbohydrate sequencing protocol becomes even more critical, and adding 10-15 minutes of light walking immediately after meals is one of the most effective interventions available.

    The signal is not the metric. The signal is the compensatory effort behind the metric. Bettering Me recommends catching that signal before the metric breaks. Measure fasting insulin. Calculate HOMA-IR. Sequence your meals. Build your glucose disposal capacity. And give your pancreas a 12-hour overnight break. It is doing work you cannot see – until the day it cannot do it anymore.

    The cost of catching it early. Fasting insulin costs approximately $20-40 out of pocket. HOMA-IR is a free calculation. Carbohydrate sequencing costs nothing. The 12-hour overnight fast costs nothing. Two resistance sessions per week costs a gym membership. The alternative – waiting for HbA1c to cross 5.7% – carries a much higher long-term cost in medications, monitoring, and complications. The early signal is cheaper than the late diagnosis in every meaningful sense.

    Disclaimer: This post is for inspiration and education, not medical advice. Everyone’s body is different, so please check with your doctor before changing your diet, exercise, or lifestyle routine. By using these tips, you agree to do so at your own risk.

    References

    [1] Kahn SE, Hull RL, Utzschneider KM. "Mechanisms linking obesity to insulin resistance and type 2 diabetes." *Nature*. 2006;444(7121):840-846.. DOI: https://doi.org/10.1038/nature05482

    [2] Matthews DR, et al. "Homeostasis model assessment: insulin resistance and beta-cell function from fasting plasma glucose and insulin concentrations in man." *Diabetologia*. 1985;28(7):412-419.. DOI: https://doi.org/10.1007/BF00280883

    [3] Shukla AP, et al. "Carbohydrate-last meal pattern lowers postprandial glucose and insulin excursions in type 2 diabetes." *BMJ Open Diab Res Care*. 2017;5(1):e000440.. DOI: https://doi.org/10.1136/bmjdrc-2017-000440

    [4] Holten MK, et al. "Strength training increases insulin-mediated glucose uptake, GLUT4 content, and insulin signaling." *Diabetes*. 2004;53(2):294-305.. DOI: https://doi.org/10.2337/diabetes.53.2.294

    [5] Sutton EF, et al. "Early Time-Restricted Feeding Improves Insulin Sensitivity, Blood Pressure, and Oxidative Stress." *Cell Metab*. 2018;27(6):1212-1221.e3.. DOI: https://doi.org/10.1016/j.cmet.2018.04.010

  • The SPRINT MIND Result Is Real – But Your 128 Systolic Is Not the Same as Their 147

    Written by

    Unpaid Intern

    –

    The SPRINT MIND trial produced a genuinely important result: intensive blood pressure control (target below 120 mmHg systolic) reduced the risk of mild cognitive impairment and probable dementia by 19% compared to standard treatment (target below 140 mmHg) [1]. This is one of the few randomized controlled trials showing that a cardiovascular intervention directly reduces dementia risk. It is real, and it should change how clinicians and patients think about the relationship between blood pressure and brain health.

    But the trial’s population matters as much as its result. The average participant in SPRINT MIND was 68 years old with established hypertension – baseline systolic averaging 147 mmHg. Many had existing cardiovascular disease or chronic kidney disease [1]. The trial proved that dropping from 147 to 121 reduces dementia risk in older adults with hypertension. It did not prove that dropping from 125 to 115 does the same thing in a 45-year-old with no cardiovascular history.

    For a 45-year-old walking around with a systolic of 125, the clinical question is not “should I get below 120.” The question is: what is the trajectory?

    A person whose blood pressure has been 118 for a decade and is now trending 125 is not the same patient as someone whose blood pressure has been 145 for a decade and is now trending 125. One is climbing. The other is descending. The same absolute number means a different thing depending on the vector. This distinction is lost in the threshold-based model that guides most clinical decisions – you are either normotensive, prehypertensive, or hypertensive, and the treatment decision fires only when you cross the line.

    The longitudinal data from the Atherosclerosis Risk in Communities (ARIC) study shows that midlife blood pressure trajectories – not single readings – predict cognitive decline decades later [2]. Participants whose systolic rose from 110 to 130 between ages 45 and 55 had higher dementia risk than those whose systolic held steady at 120 across the same window, even though both groups had identical readings at age 55. The trajectory was the signal, not the absolute value.

    This matters because the J-curve hypothesis – the idea that lowering blood pressure too aggressively in certain populations may increase cardiovascular risk – has not been resolved for primary prevention in middle-aged adults [3]. SPRINT MIND’s intensive arm used a multi-drug protocol to achieve its 121 mmHg average. The same pharmacological approach applied to someone whose systolic is 125 and climbing might produce benefit, but the trial did not test that.

    There is also the question of mechanism. Blood pressure damages cerebral small vessels over years, not weeks. The cognitive decline that SPRINT MIND prevented was the result of cumulative microvascular damage in participants who had been hypertensive for decades. A 45-year-old whose pressure is 125 and steady has accumulated far less vascular damage than a 68-year-old whose pressure was 140+ for twenty years. The intervention window is wider. The urgency is lower. But the opportunity for primary prevention is real.

    The framework Bettering Me recommends is trajectory-based, not threshold-based. If your systolic has been within a 5-point band for five years, the intervention is behavioral maintenance: sleep consistency (blood pressure drops 10-20% during deep sleep – the nocturnal dip), sodium sensitivity awareness (test this by tracking pressure for two weeks on high vs low sodium), and aerobic volume above 150 minutes per week (each 1 MET increase in fitness is associated with approximately 5 mmHg lower systolic pressure) [4].

    If your systolic has risen more than 8 points in three years, the intervention is structural – even if you haven’t crossed a “hypertensive” threshold. That means a formal assessment: 24-hour ambulatory monitoring (office readings miss nocturnal hypertension, which is independently predictive of cardiovascular events), dietary sodium assessment, sleep apnea screening (OSA is a common secondary cause of rising pressure trajectories in midlife), and a discussion about pharmacological options if lifestyle alone is insufficient [5].

    The trajectory tells you whether you are approaching a ceiling or retreating from one. SPRINT MIND proved the ceiling matters for dementia. But for most people in their 40s, it is the slope – not the ceiling – that will decide whether they ever reach it.

    A practical note on nocturnal dipping. Blood pressure normally drops 10-20% during deep sleep – the “nocturnal dip.” People whose pressure does not dip (non-dippers) have higher cardiovascular and cognitive risk, independent of daytime readings [4]. The only way to know if you are a dipper is 24-hour ambulatory monitoring. If your office BP is 125/80 but your nocturnal average is 118/75, you are fine. If it is 125/80 and your nocturnal average is 120/78, you are a non-dipper, and your trajectory-based risk is higher than the office reading suggests. This is another reason the standard threshold-based approach misses the signal.

    The sodium sensitivity variable. Approximately 50% of people with normal blood pressure are sodium sensitive – their pressure rises measurably in response to high sodium intake. The others are sodium resistant. The only way to know which you are is to test it: 7-10 days of high sodium (add salt at every meal) vs 7-10 days of low sodium (eliminate added salt, avoid processed foods), measuring BP daily at the same time. If your systolic moves more than 5 mmHg between conditions, you are sodium sensitive, and sodium management is a structural intervention for you, not a marginal one.

    The threshold is a legal category. The trajectory is a clinical signal. Know which one you are looking at.

    Disclaimer: This post is for inspiration and education, not medical advice. Everyone’s body is different, so please check with your doctor before changing your diet, exercise, or lifestyle routine. By using these tips, you agree to do so at your own risk.

    References

    [1] Williamson JD, Pajewski NM, Auchus AP, et al. "Effect of Intensive vs Standard Blood Pressure Control on Probable Dementia: A Randomized Clinical Trial." *JAMA*. 2019;321(6):553-561.. DOI: https://doi.org/10.1001/jama.2018.21442

    [2] Gottesman RF, et al. "Midlife Hypertension and 20-Year Cognitive Change: The Atherosclerosis Risk in Communities Neurocognitive Study." *JAMA Neurology*. 2014;71(10):1218-1227.. DOI: https://doi.org/10.1001/jamaneurol.2014.1646

    [3] Bohm M, et al. "J-curve relation between achieved blood pressure and cardiovascular outcomes." *European Heart Journal*. 2010;31(16):1985-1992.. DOI: https://doi.org/10.1093/eurheartj/ehq156

    [4] Cornelissen VA, Smart NA. "Exercise training for blood pressure: a systematic review and meta-analysis." *J Am Heart Assoc*. 2013;2(1):e004473.. DOI: https://doi.org/10.1161/JAHA.112.004473

    [5] Sleep Apnea and BP Trajectory