Insulin resistance after 40: The early signs nobody tells you about

Insulin resistance has a reputation as something that only shows up on a blood test, usually once it's progressed far enough to be flagged as prediabetes. In reality, your body is often signalling changes in insulin sensitivity long before any test would pick it up, if you know what to look for.

What insulin resistance actually is

Insulin's job is to help move glucose from your bloodstream into your cells, where it can be used for energy. When your cells become less responsive to insulin (insulin resistance), your body compensates by producing more of it, working harder to achieve the same effect. Over time, this drives a cascade of changes that can affect everything from energy levels to fat storage, well before blood sugar itself becomes abnormal.

This matters enormously for women over 40, because hormonal shifts during perimenopause can independently reduce insulin sensitivity, layering on top of any other lifestyle or genetic factors already at play.

Early signs worth paying attention to

Energy that crashes hard in the early-to-mid afternoon, regardless of what you ate at lunch, is one of the more common signals. So is a noticeable increase in fat storage around the midsection, even without major changes to diet or activity. Persistent sugar or carbohydrate cravings, particularly later in the day, are another — your body asking for quick glucose because your cells aren't using what's already available as efficiently as before.

Difficulty losing weight despite consistent effort, increased hunger shortly after eating, and waking up tired despite a full night's sleep can all be connected to the same underlying pattern, even though none of them individually scream "insulin resistance" on their own.

Why catching it early matters

Insulin resistance sits on a spectrum, and it's far easier to shift the trajectory early than to reverse the more entrenched changes that come with years of unaddressed insulin resistance. The encouraging part is that nutrition, movement patterns, sleep and stress management can all meaningfully influence insulin sensitivity but the right combination depends entirely on what's actually driving things for you.

Why standard testing can miss it

A standard fasting glucose test, while useful, doesn't always catch early insulin resistance, because your body can still maintain a normal blood sugar reading by producing more insulin than it used to, for a while. This compensation is precisely why so many women are told their bloods are fine year after year, right up until the point where the compensation can no longer keep pace and blood sugar markers finally shift into a flagged range.

A more complete assessment usually involves looking at the wider pattern: symptoms, family history, body composition changes and lifestyle factors together, rather than relying on a single glucose reading taken at one moment in time.

The bottom line

You don't need a diagnosis to take insulin resistance seriously. If several of these signs feel familiar, that's enough reason to look more closely at what might be driving them, rather than waiting for a number on a test to confirm what your body has likely been signalling for some time.

Wondering if some of this applies to you?

The RESET Diagnostic is a focused 30-minute session to help you understand what may be driving the changes you're noticing and what's worth doing about it.