Insulin Resistance: Why Normal Blood Sugar Can Still Hide a Metabolic Problem
Cell biologist Ben Bikman argues that insulin, not glucose, is the earliest measurable sign of metabolic trouble — and that it can be elevated for years while a standard blood panel still looks normal. He traces the chain from oversized fat cells to ceramides to whole-body insulin resistance, and explains which diet, movement and sleep habits reverse it. A three-hour tour through the biology, plus the biomarkers he would put on every blood test.
Overview
Ben Bikman, a cell biology professor who studies metabolic disorders, opens with what he calls modern medicine's glucose-centric paradigm: clinicians measure blood sugar, so insulin resistance stays invisible until glucose finally slips. He describes two routes into the problem — a fast one driven by stress hormones, inflammation and insulin itself, and a slow one that settles into fat tissue over years. The lipid that actually blocks the insulin signal, he says, is not stored triglyceride but ceramide, which is why lean marathon runners and insulin-resistant individuals can carry similar muscle fat.
From there the conversation turns to the fat cell as the first domino: as cells enlarge rather than multiply, they become insulin resistant, hypoxic and inflammatory, spilling fatty acids into liver and muscle. That framing explains the ethnic and sex differences in diabetes rates, and why visceral fat behaves the way it does. On the practical side, Bikman describes a published clinical series in which eleven women with newly diagnosed type 2 diabetes moved their average A1C from 8.9 to 5.6 in ninety days on three rules: control carbs, prioritize protein, don't fear the fat that comes with it.
Sleep gets its own chapter — a single short night raises cortisol and adrenaline enough to blunt insulin sensitivity the next day, and evening snacking sets up a glycemic swing that wrecks the night that follows. He is enthusiastic but cautious about GLP-1 medications, preferring a low-dose, cycled framing aimed at habit change rather than weight loss. The closing stretch covers the markers he watches — fasting insulin, triglyceride-to-HDL ratio, uric acid — and one habit he would change first: breakfast, starting tomorrow.
Key quotes
5To some degree, insulin resistance is a common root cause for most chronic diseases.
Insulin is one of the few peptide hormones that will literally affect every single cell of the body.
In just 90 days their average A1C went from 8.9 to 5.6 — without a pill popped or a needle injected.
If I could change health care policy, my one thing would be to have insulin be a standard measurement on every blood test.
Change breakfast, and change it tomorrow.
Key ideas
9Insulin moves first, glucose moves last
In the early stage, insulin runs two to four times higher while glucose still reads normal. Because routine panels track glucose only, the earliest signal passes under the radar for years.
The skin as a window
Two visible patterns often accompany insulin resistance: darker, crinkled tissue-paper skin around the neck, and small stalk-like skin tags at the neck or armpits. Both tend to fade as insulin sensitivity improves.
Fast and slow insulin resistance
Stress hormones, inflammation and excess insulin itself can blunt insulin signalling within hours — and resolve just as quickly when the stimulus goes. The slow version settles into fat tissue over years and takes weeks to months to unwind.
Ceramides, not stored fat
Muscle triglycerides are metabolically inert: lean endurance runners carry as much as insulin-resistant individuals. The lipid family that actually blocks the insulin signalling cascade is ceramide, and every fast trigger drives its accumulation.
Insulin is the gatekeeper of the fat cell
Fat cells grown in a nutrient-rich dish stay small until insulin is added. Energy and the insulin signal are both required — calories alone don't fill a fat cell, and insulin alone with no incoming energy is incompatible with life.
The combination matters more than either macronutrient
As carbohydrate intake falls, dietary saturated fat appears to matter far less, because most circulating saturated fat is made by the liver. High carbohydrate together with high saturated fat is, in his reading of the evidence, the least favourable pairing.
Metabolic wiggle room
Lower insulin comes with a higher metabolic rate — a few hundred calories a day — plus calories exhaled and excreted as ketones. Muscle mass and physical activity widen the same margin by clearing glucose faster.
Evening eating and the night that follows
A late glycemic spike is followed by a dip that activates the sympathetic nervous system just as the body should be winding down — a racing pulse and warmth that read as anxiety. Earlier, fewer meals track with better outcomes.
Fat cell size beats fat mass
Bodies expand fat either by making more cells or by enlarging existing ones. Enlarged cells turn insulin resistant, hypoxic and inflammatory — which is why leaner populations with fewer, larger fat cells can show higher rates of metabolic disease.
Practical takeaways
7- 1
Use a glucose monitor for the curve, not the number 0:14
The morning reading tells you little. The useful signal is how fast a meal's rise comes back down — roughly two hours is the benchmark he uses.
- 2
Three rules, ninety days 2:01
Control carbohydrates by eating whole fruits and vegetables, prioritize protein, and don't fear the fat that naturally comes with it. Ninety days is the window he considers reasonable for meaningful change.
- 3
Close the kitchen three to four hours before bed 1:25
Stacking most calories earlier in the day and leaving a gap before sleep supports both insulin sensitivity and sleep quality — the one habit he calls the hardest and the most worthwhile.
- 4
Take the ten-minute walk after your biggest meal 2:11
Ten to fifteen minutes of easy movement after the largest, most glucose-raising meal can cut the excursion by roughly half — separate from whatever training you do.
- 5
Train to failure, whatever the weight 2:13
With limited time he defaults to strength work over cardio, and the variable he cares about is reaching fatigue — light weight and high repetitions count.
- 6
A tart drink before the starchiest meal 2:16
A couple of tablespoons of diluted apple cider vinegar before a starchy meal visibly flattens the glucose curve — acetic acid nudges the same muscle transport pathway that exercise opens.
- 7
Ask for fasting insulin and the triglyceride-to-HDL ratio 2:48
Fasting insulin is the marker he would add to every panel; triglycerides divided by HDL, with 1.5 as the reference point, is a simple number you can calculate from a standard result you already have.
Topics & chapters
15The glucose-centric blind spot
Why normal blood sugar can coexist with years of rising insulin — and the visible skin patterns and glucose-curve habits that hint at it earlier.
One root, many branches
The case for treating insulin resistance as common soil under many chronic conditions rather than trimming each branch separately.
Fast versus slow insulin resistance
Stress, inflammation and excess insulin act within hours; the slow, fat-tissue-driven form builds over years.
Ceramides, not triglycerides
The athlete's paradox, and why one lipid family blocks the insulin signal while stored fat sits inert.
Insulin, gatekeeper of the fat cell
Cells in a dish, the energy-plus-signal requirement, and what happens to metabolic rate when insulin comes down.
Carbohydrate, saturated fat and the worst pairing
Why dietary saturated fat behaves differently at low and high carbohydrate intake, and where seed oils do and don't belong in the story.
Metabolic wiggle room
The 2021 controlled feeding study, its limits, and the case that lower insulin buys several hundred calories a day of margin.
Meal frequency and the evening trap
Why six eating occasions a day became normal, what the glycemic roller coaster does to hunger, and the case for earlier, fewer meals.
Sleep, stress hormones and caffeine
One short night raises cortisol and adrenaline enough to blunt insulin sensitivity the next day — and the usual fix compounds it.
Air particles, vaping and medications
Diesel exhaust and cigarette particles in animal work, early vaping data, and the metabolic footprint of some commonly prescribed drugs.
The ninety-day turnaround
Eleven women, three dietary rules, and an average A1C that moved from 8.9 to 5.6 in a published clinical series.
Exercise snacks and apple cider vinegar
Strength work over cardio when time is short, the post-meal walk, and the mechanisms behind vinegar, ketones and short-chain fats.
Fat cell size versus number
Hyperplasia, hypertrophy, ethnic and sex differences in fat storage, and why visceral fat behaves the way it does.
GLP-1: microdosing and cycling
How these medications actually work, what the higher doses bring with them, and his preferred framing as a habit-change tool.
Biomarkers and one change tomorrow
Fasting insulin, triglyceride-to-HDL ratio and uric acid — and why he would start with breakfast.