Educational

A common experience in the mid-forties onward: nothing about eating or activity has changed, and blood sugar starts running higher.

It isn't imagination, and it isn't a failure of discipline. The hormonal shift through perimenopause and menopause affects glucose metabolism directly, through several routes at once.

What estrogen was doing

Estrogen improves insulin sensitivity. It also influences where the body stores fat, favouring hips and thighs over the abdomen, and it has effects on how the liver handles glucose.

As levels fall, each of those reverses. Cells become somewhat less responsive to insulin. Fat storage shifts toward the abdomen — and visceral fat is metabolically active in a way subcutaneous fat isn't, releasing inflammatory signals that further worsen insulin resistance.

The result is that the same meal, the same portion, and the same activity produce a higher number than they did five years earlier.

Perimenopause is the unpredictable part

The years before periods stop are frequently harder to manage than the years after, because estrogen isn't falling smoothly — it's fluctuating, sometimes dramatically, cycle to cycle.

For anyone on insulin, that means insulin sensitivity itself is moving around, and doses that worked last month may not this month. Many women with type 1 report needing to adjust ratios repeatedly during this period, then finding things settle into a new, more stable pattern afterward.

Tracking through this stretch is worth more than usual. A pattern across two or three months is visible in data and invisible in memory.

The symptom overlap nobody warns you about

Hot flushes and hypoglycemia share a symptom list: sweating, palpitations, shakiness, sudden warmth, anxiety.

For someone on insulin or a sulfonylurea, that's a genuine safety problem. A low can be dismissed as a hot flush and left untreated, or a flush can be treated as a low and produce an unnecessary rise.

The only reliable answer is to test rather than interpret. This is a period where a CGM earns its cost, because it removes the guesswork from a symptom that now has two plausible explanations.

Sleep is the multiplier

Night sweats and disrupted sleep are among the most common menopausal complaints, and sleep loss independently reduces insulin sensitivity and raises cortisol.

So the mechanism stacks: less estrogen worsens insulin resistance directly, and the sleep disruption it causes worsens it again. People often find their fasting numbers are the first thing to move, which fits — that's where a bad night shows up.

Addressing the sleep is one of the highest-value interventions available here, whatever the route: a cooler room, cutting evening alcohol, treating the flushes themselves.

Muscle, and why it matters more now

Muscle mass declines with age, and the decline accelerates around menopause. Muscle is where most glucose gets taken up after a meal, so losing it directly reduces your capacity to handle carbohydrate.

Resistance training is the countermeasure, and its value here is hard to overstate. It preserves muscle, improves insulin sensitivity independently of weight change, and supports bone density at exactly the point when bone loss accelerates. Two sessions a week is the usual starting recommendation.

Protein intake matters alongside it. Requirements rise with age, and the commonly suggested target for older adults — somewhere around 1.0 to 1.2 g per kilogram of body weight — is well above the standard RDA.

Hormone therapy, briefly and carefully

Menopausal hormone therapy is not prescribed as a diabetes treatment. The evidence does suggest it tends to improve insulin sensitivity, and large trials have found lower rates of new type 2 diabetes among women taking it.

Whether it's appropriate depends on symptoms, timing, cardiovascular risk, breast cancer history and personal preference, and that's a discussion with a clinician who knows your history. It's worth raising as part of the conversation rather than assumed to be off the table — the risk picture has been re-examined considerably since the early 2000s coverage that shaped most people's impressions.

What actually helps day to day

The interventions aren't novel; their relative importance shifts.

Protein at every meal, rather than concentrated at dinner. Resistance training twice a week, treated as non-negotiable. Fibre, which helps with both glucose and the cholesterol changes that arrive at the same time. Reducing alcohol, which worsens hot flushes, disrupts sleep, and adds a delayed-low risk for anyone on insulin. And attention to the glycemic load of meals, which does more now than it did when insulin sensitivity was better.

Weight gain through this period is common and partly hormonal. It's worth separating the health question from the appearance one: the visceral fat is the part that matters metabolically, and it responds well to resistance training and protein even when the number on the scale is stubborn.

What to bring to an appointment

If your numbers have drifted and nothing about your habits has, say so plainly and name the timing. This connection is well established and still gets missed, and it's frequently attributed to diet before anyone considers the obvious.

Medication needs genuinely change here. Insulin ratios, oral medication doses, and whether something should be added are all reasonable things to review — and reviewing them is considerably better than absorbing three years of higher numbers on the assumption that you should be trying harder.

Bring data if you have it. Three months of readings showing a drift, alongside a note of when symptoms started, makes the pattern obvious in a way that a description in a ten-minute appointment doesn't.