vanilis But honestly. That’s the trap.
Insulin resistance can be brewing for years while your blood sugar looks “normal enough” on basic labs. You feel off, your body starts doing weird little things, your energy tanks, weight creeps up, cravings get louder, sleep gets lighter. And because you’re not diabetic, you tell yourself it’s stress. Or age. Or hormones. Or you just need more discipline.
Sometimes it is those things. But insulin resistance can be the quiet driver underneath.
Let’s talk about the silent warning signs. The ones that show up in real life. Not just on a lab printout.
First, what insulin resistance actually is (in plain language)
Insulin is a hormone your pancreas makes to help move glucose from your blood into your cells, so you can use it for energy.
When you become insulin resistant, your cells stop responding well to insulin. So your body compensates by making more insulin to get the job done.
This matters because you can have high insulin for a long time before you ever see high glucose.
So yes. You can be “not diabetic” and still be dealing with insulin resistance.
And high insulin is not neutral. It nudges your body toward fat storage, inflammation, higher triglycerides, hormonal disruption, and more hunger. It also tends to make you feel kind of… not like yourself.
Why it’s missed so often
A lot of routine checkups look at:
Those are helpful. But they can be late stage indicators.
Many people with insulin resistance will still have:
- “Normal” fasting glucose
- A1c in the normal range or barely creeping up
Meanwhile insulin is climbing, and symptoms are already happening.
That’s why I like patients to think symptom first, pattern first. Labs matter, but your body usually starts whispering before it starts shouting.
Silent warning signs of insulin resistance (without diabetes)
These are common patterns I see. Not everyone has all of them. But if you’re nodding along to several, it’s worth looking closer.
1) You get sleepy after meals, especially carbs
That post lunch crash where your eyes feel heavy and you could honestly nap under your desk.
A normal meal shouldn’t wipe you out. When it does, it can be a sign your blood sugar and insulin are swinging more than you think.
And it’s not just “you ate too much.” It’s often what you ate and how your body handled it.
2) You’re hungry again weirdly soon
You eat breakfast, it seems fine, and then two hours later you’re hunting for snacks. Not because you’re bored. Because you feel that urgent “need food now” feeling.
Insulin resistance often shows up as reduced satiety. Your cells aren’t using fuel well, so your brain keeps asking for more.
3) Cravings that feel loud, not casual
This one is big.
It’s not “dessert sounds good.” It’s “I can’t stop thinking about something sweet” or “I need carbs to feel okay.”
Sugar cravings can be emotional, sure. But they can also be biochemical. When your glucose dips after a spike, your body calls for quick fuel. Usually sugar. Usually now.
4) Weight gain around the belly, even if you’re doing “the right things”
Insulin is a storage hormone. When it’s chronically high, the body tends to store more fat, particularly in the abdominal area.
This can happen even when calories are not outrageous. Even when you’re working out.
People get frustrated because they’re trying hard, and the results feel unfair. Sometimes it’s not effort. It’s physiology.
5) You can’t lose weight like you used to
This is slightly different from belly weight gain.
It’s the feeling of pushing and pushing and getting nowhere. Diet works for everyone else. For you it works for two weeks then stalls. Or it works only if you go extreme, and you feel miserable doing it.
That pattern can be a clue that insulin is staying elevated and blocking fat loss.
6) Brain fog and “low battery” days
Insulin resistance isn’t just about sugar. It affects how your cells access energy.
A lot of people describe:
- foggy thinking
- trouble focusing
- feeling unmotivated
- feeling “heavy” mentally
And it can be on and off. Some days you’re fine. Other days, not.
7) You wake up tired, even after sleeping
This one gets blamed on everything. And sometimes it is sleep apnea, stress, cortisol dysregulation, perimenopause, iron issues, thyroid issues.
But insulin resistance can absolutely contribute. Especially when glucose swings at night disrupt deep sleep. Or when inflammation is higher. Or when hunger hormones get dysregulated.
You might be “sleeping” but not recovering.
8) You feel shaky, anxious, or irritable when you haven’t eaten
If you get hangry fast, or you feel jittery between meals, that can be reactive hypoglycemia.
Not always. But often it’s the spike and crash pattern.
People describe it as:
- “I get anxious if I skip breakfast”
- “I feel shaky if lunch is late”
- “I feel better immediately when I eat”
Again, this can be a big clue.
9) Skin changes: darker patches, skin tags, more acne
Classic signs can include:
- Acanthosis nigricans: darker, velvety skin often around the neck, armpits, groin
- Skin tags, especially around neck and underarms
- Acne, particularly jawline or persistent adult acne
These don’t automatically mean insulin resistance, but they’re common in that terrain.
If you’ve noticed skin tags popping up over time, don’t ignore it.
10) Your blood pressure is creeping up
Insulin resistance often clusters with cardiometabolic shifts.
Even before diabetes, you might see:
- higher blood pressure
- higher triglycerides
- lower HDL
- fatty liver changes
So if your doctor mentions “your blood pressure is a little higher than last year” and nothing changes, that trend matters.
11) You snack at night, or feel “wired but tired”
Some people with insulin resistance feel a second wind at night. Or they crave snacks after dinner even if they ate enough.
It’s not always willpower. Sometimes it’s blood sugar instability plus stress hormones plus habit loops. A perfect storm.
12) You have PCOS, irregular cycles, or fertility issues
Insulin resistance is strongly tied to PCOS for many women.
It can show up as:
- irregular cycles
- acne
- hair thinning on scalp
- hair growth on face/body
- difficulty conceiving
If you’re dealing with these and you’ve never had insulin assessed, that’s a gap worth closing.
13) Your labs look “not terrible” but are trending the wrong way
This is where people get dismissed.
A1c 5.4. Fine. Fasting glucose 96. Fine. Triglycerides 140. “A little high but okay.”
But trends matter. And optimal ranges often tell a different story than “normal.”
Also, insulin is rarely tested in standard visits. Which is… honestly wild, given how early it moves.
Lab markers that can catch it earlier (talk to your clinician)
Not medical advice, just education to help you have a better conversation with your clinician.
Some helpful labs include:
- Fasting insulin
- HOMA-IR (calculated from fasting glucose and fasting insulin)
- Fasting glucose and A1c (still useful, just not the whole story)
- Oral glucose tolerance test (sometimes paired with insulin levels for deeper insight)
- Triglycerides and HDL
- ALT/AST (fatty liver clues, among other things)
If you’re already seeing symptoms but basic labs look fine, you may need a wider lens.
This is one reason functional and integrative medicine can be helpful. It’s not magic. It’s just a more systems based view.
The sneaky root contributors (why it happens)
Insulin resistance is multi factor. It’s rarely one thing.
Common contributors include:
- High intake of ultra processed carbs and sugars (especially liquid sugar)
- Frequent snacking and never letting insulin come down
- Low muscle mass (muscle is a big glucose sink)
- Sedentary lifestyle, even if you work out a few times a week
- Chronic stress (cortisol and glucose are connected)
- Poor sleep or sleep apnea
- Perimenopause/menopause shifts
- Inflammation and gut issues
- Certain medications (sometimes)
- Genetic predisposition
That’s why “just eat less” is such a useless oversimplification. For many people, the fix is more about rebuilding metabolic flexibility than punishing yourself.
What you can start doing now (simple, not extreme)
You don’t need to do everything at once. And you definitely don’t need a crash diet.
Here are the basics that move the needle for most people.
Build meals that lower the glucose spike
Think: protein + fiber + healthy fat first, then carbs.
Examples:
- Eggs + veggies + avocado, then fruit
- Greek yogurt + chia + nuts, then granola if you want it
- Chicken or tofu salad with olive oil dressing, then a small portion of rice or potatoes
You’re not banning carbs. You’re changing the order and the dose.
Walk after meals (seriously, it works)
A 10 to 20 minute walk after meals can improve post meal glucose handling.
Not a power walk. Just consistent movement.
If you do one thing this week, do this.
Strength train, even gently
Muscle improves insulin sensitivity. Period.
You do not have to become a gym person. You just need progressive resistance.
- bodyweight squats
- bands
- light dumbbells
- machines if you like them
Two to three times per week can make a noticeable difference over time.
Sleep like it matters (because it does)
Even one week of poor sleep can worsen insulin sensitivity in studies.
Start simple:
- consistent bedtime
- morning light exposure
- limit alcohol (it fragments sleep)
- stop scrolling in bed if you can, or at least dim the lights
Stop grazing all day
This is not about starvation. It’s about giving insulin a chance to come down.
If you’re constantly sipping sweet drinks, snacking, nibbling, tasting. Insulin is constantly being tapped on the shoulder.
Try:
- three solid meals
- optional protein centered snack if truly needed
Support your gut and inflammation load
This is where the functional medicine view is useful.
Gut dysbiosis, constipation, chronic bloating, and inflammatory triggers can keep the whole system more insulin resistant. It’s not the only factor, but it can be a stubborn one.
If you’ve been dealing with digestive issues alongside fatigue, skin issues, and weight resistance, that pattern matters. It’s not random.
On Dr. Lisa Silvani’s site (LisaSilvani.com), there are resources that connect the dots between gut health, hormones, and metabolism, including the Metabolizm quiz. If you’re the type who likes a clear starting point, that’s an easy next step.
When to take it more seriously
Consider getting support sooner rather than later if:
- your symptoms are escalating
- your belly weight is increasing despite consistent habits
- you have PCOS or a strong family history of diabetes
- triglycerides are rising or HDL is dropping
- you feel stuck in cravings, crashes, and fatigue cycles
The goal is not to wait until you “qualify” for a diagnosis.
The goal is to catch the early terrain change and reverse it while it’s still very workable.
A quick reality check (because this needs saying)
If you suspect insulin resistance, please don’t use it as a reason to blame yourself.
This is not a character flaw. It’s a metabolic adaptation to modern inputs. Food environment, stress load, sleep disruption, hormone changes, past dieting, gut inflammation. It all counts.
Also, you don’t need perfection to get results. You need the right levers, pulled consistently.
Wrap up
Insulin resistance without diabetes is common, under diagnosed, and often hiding in plain sight.
If you’re dealing with post meal crashes, stubborn belly weight, intense cravings, fatigue that sleep doesn’t fix, brain fog, or skin changes like skin tags. Don’t shrug it off just because your A1c is “normal.”
Look at patterns. Ask better lab questions. And start with the basics that restore insulin sensitivity.
If you want a guided next step that’s more personalized, you can explore the metabolic resources and book a consultation through Dr. Lisa Silvani’s website at https://www.lisasilvani.com. Sometimes the fastest way forward is having someone look at the whole picture with you.
FAQs (Frequently Asked Questions)
What is insulin resistance and how does it affect my body?
Insulin resistance occurs when your body’s cells stop responding well to insulin, a hormone that helps move glucose from your blood into your cells for energy. To compensate, your body produces more insulin, which can lead to fat storage, inflammation, higher triglycerides, hormonal disruption, increased hunger, and feelings of not being yourself.
Can I have insulin resistance even if my blood sugar tests appear normal?
Yes. Many people with insulin resistance have normal fasting glucose and Hemoglobin A1c levels because these tests often show changes only in later stages. Insulin levels can be high for years before blood sugar rises, so symptoms may appear before lab results indicate a problem.
What are the silent warning signs of insulin resistance that I should watch for?
Common signs include feeling sleepy after meals (especially carbs), getting hungry soon after eating, intense cravings for sweets or carbs, unexplained belly weight gain despite healthy habits, difficulty losing weight like before, brain fog or low energy days, waking up tired even after sleep, and feeling shaky or irritable when you haven’t eaten.
Why do I experience cravings and hunger soon after meals if I’m not diabetic?
In insulin resistance, your cells don’t use fuel effectively, causing your brain to signal for more food sooner than usual. Blood sugar spikes followed by dips can trigger strong cravings for quick sources of energy like sugar and carbs.
How does insulin resistance impact my ability to lose weight?
Chronically high insulin promotes fat storage and makes it harder to lose weight. You might find that diets work briefly then stall or require extreme measures that feel unsustainable. This happens because elevated insulin blocks fat loss despite your efforts.
What causes fatigue and brain fog in people with insulin resistance?
Insulin resistance affects how your cells access energy, leading to symptoms like foggy thinking, trouble focusing, feeling unmotivated or mentally heavy. These effects can fluctuate daily as glucose and insulin levels swing.
References
- DeFronzo, R. A., Ferrannini, E., Groop, L., et al. (2015). Type 2 diabetes mellitus. Nature Reviews Disease Primers, 1, 15019. https://doi.org/10.1038/nrdp.2015.19
- Reaven, G. M. (1988). Role of insulin resistance in human disease. Diabetes, 37(12), 1595-1607. https://doi.org/10.2337/diab.37.12.1595
- Samuel, V. T., & Shulman, G. I. (2016). The pathogenesis of insulin resistance: integrating signaling pathways and substrate fluxes. The Journal of Clinical Investigation, 126(1), 12-22. https://doi.org/10.1172/JCI77812
- Garber, A., Abrahamson, M., Barzilay, J., et al. (2020). Consensus Statement by the American Association of Clinical Endocrinologists and American College of Endocrinology on the comprehensive type 2 diabetes management algorithm – 2020 Executive Summary. Endocrine Practice, 26(1), 107-139. https://doi.org/10.4158/CS-2019-0472
- Cleveland Clinic Staff. Insulin Resistance: Symptoms, Causes & Treatment Options – Cleveland Clinic Health Essentials [Internet]. Cleveland Clinic; 2023 [cited 2024 Jun]. Available from: https://my.clevelandclinic.org/health/body/22601-insulin
- National Health Service (NHS) UK (2023). Insulin resistance and pre-diabetes – NHS advice and guidance [Internet]. Available from: https://www.nhs.uk/conditions/type-2-diabetes/preventing-type-2-diabetes/
- Centers for Disease Control and Prevention (CDC). Understanding Carbohydrates and Blood Sugar – Diabetes Basics [Internet]. CDC; 2023 [cited 2024 Jun]. Available from: https://www.cdc.gov/diabetes/managing/eat-well/understanding-carbs.html
- Weyer, C., Bogardus, C., Mott, D.M., & Pratley, R.E. (1999). The natural history of insulin secretory dysfunction and insulin resistance in the pathogenesis of type 2 diabetes mellitus. The Journal of Clinical Investigation, 104(6), 787–794. https://doi.org/10.1172/JCI7294
- McLaughlin, T., Lamendola, C., Liu, A., & Abbasi, F. (2004). Preferential fat deposition in subcutaneous versus visceral depots is associated with insulin sensitivity in overweight and obese women*. Obesity Research,12(10),169–172.
- Eckel, R.H., Grundy, S.M., & Zimmet, P.Z.(2005). The metabolic syndrome.Lancet;365(9468):1415–1428.
- Nature Reviews Endocrinology Editorial Staff.(2017). Sleep and metabolic health.Nat Rev Endocrinol;13:677–678.doi:10.1038/nrendo.
- Dietary Guidelines Advisory Committee.(2020). Scientific Report of the Dietary Guidelines Advisory Committee on the Dietary Guidelines for Americans.
- Fernandez-Verdejo,R.(2020). Postprandial sleepiness is a real phenomenon that can be modulated by diet.Nutritional Neuroscience;23(9):645–652.doi:10.1080/1028415X.
- Hyman,M.(2019). Food: What the Heck Should I Eat? Little Brown Spark.
- Ruscio,M.(2016). Healthy Gut Healthy You: The Personalized Plan to Transform Your Health from the Inside Out.
- Kara Fitzgerald.(2017). The Metabolic Approach to Cancer.
- Healthline Media.(2023). What Causes High Triglycerides but Normal Cholesterol? Available from: https://www.healthline.com/health/cholesterol/what-causes-high-triglycerides-but-normal-cholesterol
- National Center for Biotechnology Information (NCBI) Bookshelf.(2014). Inflammation and Metabolic Disorders [Internet]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK326741/
- Singh,S.P., Singh,V.K., & Singh,S.K.(2020). Gut microbiota influences glucose metabolism through gut hormone secretion.Nutrition & Diabetes;10(1):1–13.doi:10.1038/s41387-020-00141-x
