Why your blood sugar is the real reason the weight won’t budge after 35

If you’re eating “well,” exercising regularly, and doing everything you used to do in your 20s to lose weight, but the scale refuses to move, I want to gently redirect your attention.

It may not be your calories.
It may not be your effort.
It may not even be your hormones — at least not directly.

It’s very often your blood sugar, and once you understand this, everything starts to make sense.

The hidden shift that happens after 35

In your late 30s and early 40s, your hormonal landscape begins to change. Progesterone gradually declines, estrogen fluctuates more unpredictably, and cortisol sensitivity can increase. This transition, often referred to as perimenopause, alters how your body responds to stress and carbohydrates.

Dr Lara Briden speaks frequently about this stage as a time when women become less metabolically flexible. What worked before suddenly stops working, not because your body is faulty, but because it requires a different strategy. At the same time, muscle mass naturally begins to decline if we are not actively maintaining it. Muscle is one of the most important tissues for insulin sensitivity. Less muscle means your body has fewer places to store glucose efficiently. Combine hormonal shifts, reduced muscle mass, chronic stress, and modern high-carbohydrate eating patterns, and you have the perfect environment for insulin resistance to creep in quietly.

What blood sugar really has to do with weight gain

When you eat carbohydrates, they break down into glucose. Glucose enters your bloodstream and your pancreas releases insulin to move that glucose into your cells. Insulin is not the enemy though, It’s essential, however chronically elevated insulin, driven by frequent blood sugar spikes, can make fat loss extremely difficult.

Dr Amy Shah often explains that insulin is a storage hormone. When insulin is elevated, your body is in storage mode. When insulin is lower and stable, your body can access stored fat more easily. If your blood sugar is spiking and crashing throughout the day, even from foods you perceive as healthy, you are spending more time in fat storage mode.

This is why many women say, “I eat clean but I can’t lose weight.”

It is not just what you are eating, it is how your body is responding to it.

Signs your blood sugar may be dysregulated

You may notice:

• Cravings around 3pm.

• Energy crashes after meals.

• Feeling shaky or irritable if you skip a meal.

• Difficulty losing weight around the abdomen.

• Waking between 2–4am.

• Needing coffee to function.

• Feeling hungrier than you used to.

These are subtle signs that insulin and cortisol may be working harder than they should.

Dr Mindy Pelz often discusses how women’s bodies respond differently to fasting and blood sugar stress compared to men, especially during perimenopause. Timing meals strategically and understanding your hormonal rhythm becomes more important in this stage.

Why traditional dieting backfires after 35

When women hit resistance, the instinct is often to:

• Eat less

• Skip meals

• Increase cardio

• Cut calories aggressively

Unfortunately, this can increase cortisol and worsen insulin resistance. Dr Austin Mills emphasises that metabolic healing is about stabilising, not starving – when your body feels safe and nourished, insulin sensitivity improves. Undereating protein and relying heavily on carbohydrates, even whole-grain ones, can perpetuate blood sugar instability.

The goal is not restriction. It is regulation.

The perimenopause blood sugar connection

During perimenopause, estrogen fluctuations can impair insulin sensitivity. Estrogen helps cells respond to insulin efficiently. When estrogen becomes erratic, insulin’s job becomes harder. This is why many women suddenly gain weight around the midsection despite no major dietary changes.

It is not a willpower issue (Whew!!), it is a metabolic shift.

Dr Lara Briden highlights that supporting ovulation and stabilising blood sugar can significantly improve symptoms in this stage.

How to stabilise blood sugar naturally

The good news is that insulin resistance is highly responsive to lifestyle change:

1.Start with protein and aim for 25–35 grams of protein at each meal – this stabilises glucose response and reduces cravings later in the day.

2. Prioritise strength training over excessive cardio – muscle increases insulin sensitivity dramatically.

3. Do not skip breakfast if your cortisol is already high. A protein-rich breakfast within 60–90 minutes of waking can reduce stress hormone spikes.

4. Walk after meals. Even a 10-minute walk improves glucose clearance.

5. Reduce refined carbohydrates, especially in isolation. Pair carbohydrates with protein and fat to blunt glucose spikes.

6. Sleep earlier – poor sleep increases insulin resistance within days.

Where gut health fits into this

Insulin resistance and gut health are intimately connected. When the gut lining is inflamed or the microbiome is imbalanced, systemic inflammation rises. Inflammation impairs insulin signalling.

A healthy gut improves nutrient absorption, reduces inflammation, and supports metabolic function.

This is one of the reasons I emphasise foundational gut support. For Her is not marketed as a weight-loss product, but when digestion improves and inflammation decreases, blood sugar stability often follows.

When the gut calms, cortisol calms and when cortisol calms, insulin responds more appropriately.

Everything is connected.

What real progress looks like

It does not look like rapid weight loss in two weeks.

It looks like:

• Stable energy

• Fewer cravings

• Reduced bloating

• Deeper sleep

• Gradual, sustainable fat loss

When blood sugar stabilises, your body feels safe and when your body feels safe, it releases excess weight more willingly. If you have felt frustrated because your old methods stopped working, I want you to know this: you are not failing, you simply need a strategy that matches this stage of life.

And once you make that shift, trust me, everything becomes easier.