In short
If you're hungrier than you used to be on the same meals, that's physiology, not weakness. Oestrogen normally helps keep your appetite in check, and as it swings and falls in perimenopause, your hunger and fullness signals become less reliable, says Sarah McLachlan, The Perimenopause Naturopath (BHSc Naturopathy). Stress, poor sleep, and processed food push them further out.
In this post:
- Why "just eat until you're full" stops working when hormones are shifting
- Leptin and ghrelin: your fullness and hunger switches
- What throws your appetite hormones out (stress, sleep, dieting, processed food)
- Signs your hunger signals aren't reliable, and what helps
Why doesn't "just eat when you're hungry" or intuitive eating work in perimenopause?
Because intuitive eating relies on your hunger signals being accurate, and in perimenopause they often aren't. "Eat when you're hungry, stop when you're full" is lovely advice when leptin and ghrelin are working properly. But if your appetite hormones and blood biochemistry are out of kilter, your intuition is reading a faulty gauge.
I see this constantly: women eating the same meals that satisfied them for years, now hungry an hour later, and blaming their discipline instead of their biochemistry. It isn't a lack of willpower. Your body isn't broken either; it's responding exactly as designed to signals that have shifted. This post is about what shifted, and how to steady it.
What are leptin and ghrelin?
They're the two main switches for appetite. Leptin is the fullness switch: made by your fat cells, it tells your brain you've had enough, so you stop eating. Ghrelin is the hunger switch: made in your stomach, it rises before meals and tells your brain it's time to eat. When both work properly, hunger and fullness feel obvious. When they don't, you can feel hungry after a full, balanced meal, or never quite satisfied.
The supporting cast matters too:
- Neuropeptide Y (NPY): made in the brain, drives carbohydrate cravings, especially under stress. Leptin normally keeps NPY quiet; chronic stress and a high-sugar diet turn it up.
- GLP-1: made in the gut, steadies blood sugar and slows digestion so you stay fuller for longer. The weight-loss medications like Ozempic work by mimicking it.
- CCK: helps digest fats and proteins and dials appetite down after eating.
- PYY: made in the small intestine, reduces appetite between meals.
Why is my appetite worse in perimenopause?
Because oestrogen is part of your appetite-control system, and it's on a rollercoaster. Research on sex hormones and eating shows oestrogen has a genuine appetite-suppressing effect, working through the same brain pathways as your fullness signals (Asarian and Geary, 2013). As oestrogen swings high and low and then falls in perimenopause, that steadying influence becomes unreliable, so hunger can arrive louder and fullness later.
Add in the poor sleep and higher stress that perimenopause serves up, and the picture compounds: in a large sleep study, people sleeping 5 hours had about 15% less leptin and 15% more ghrelin than those sleeping 8, independent of body size (Taheri et al., PLoS Medicine, 2004). Less fullness signal, more hunger signal, on less sleep. Sound familiar? You're not imagining being hungrier. And it's not you failing the plan.
What throws leptin and ghrelin out of balance?
Four everyday things, and perimenopause amplifies all of them. Chronic stress, short sleep, over-restrictive dieting and a diet heavy in processed food each push leptin down, ghrelin up, or both. That's why the fix is never "try harder"; it's removing what's jamming the signals.
- Stress and cortisol. High cortisol blunts leptin's fullness message and nudges ghrelin up, so you can feel hungry soon after eating. Stress also switches on NPY, which is why stress cravings are so often carbs.
- Poor sleep. Short sleep lowers leptin and raises ghrelin, and it steers cravings toward high-energy comfort foods the next day.
- Dieting and over-restricting. Cutting hard makes your body think it's starving: leptin drops, ghrelin climbs, and hunger wins. It's one reason strict dieting backfires in your 40s; strategy beats restriction.
- Processed, sugary food. A diet heavy in ultra-processed food interferes with leptin signalling, which brings us to leptin resistance.
What is leptin resistance?
Leptin resistance is when your brain stops hearing the fullness signal. Fat tissue isn't inert storage; it's hormonally active, and it's your main leptin factory. With more central body fat, leptin rises, and research in postmenopausal women shows central fat is the single biggest driver of both leptin and ghrelin levels (Ritland et al., 2008). But when leptin stays high for long enough, the brain becomes deaf to it: your appetite switch is stuck on.
That's the vicious cycle: more fat, more leptin, less signal getting through, more hunger. Breaking it isn't about eating less through gritted teeth; it's about calming the inputs (stress, sleep, processed food) so the signal can be heard again.
Hunger in perimenopause
Your appetite switches
Leptin is the fullness switch. Ghrelin is the hunger switch. Perimenopause unsettles both.
When the switches work
Leptin: the off switchMade by fat cells. Tells your brain you've had enough, so you stop eating.
Ghrelin: the on switchMade in your stomach. Rises before meals, settles after them.
The resultHunger and fullness feel obvious. You eat, you're satisfied, you move on.
In perimenopause
Oestrogen swings and fallsIts appetite-steadying effect becomes unreliable.
Stress and short sleep pile onCortisol blunts leptin; short sleep lowers leptin and raises ghrelin.
The resultHungry after full meals. Never quite satisfied. Same food, louder appetite.
It's not willpower.
It's signalling.
Steady the inputs and the signals steady too.
What are the signs your hunger signals aren't reliable?
- Constant hunger even after eating full, balanced meals
- Cravings for sugary or high-carb foods, particularly when stressed
- Feeling unsatisfied after eating, no matter how much or what you've eaten
- Weight gain, especially around the middle, without obvious changes in eating or movement
- Emotional eating, or eating as a way to deal with stress
- Difficulty stopping once you've started
- Increased cravings for salty, crunchy foods, especially after poor sleep
Ticking a few of these? Your appetite hormones are worth taking seriously. Which of your blockers matters most? The Blockers Quiz will show you.
What actually helps get your hunger signals working again?
Steady the inputs and the signals steady too. None of this is a 30-day fix; it's how the system is designed to work when it's not being jammed.
- Protein at every meal. Protein is the most satiating macronutrient and takes pressure off the ghrelin rollercoaster. Build each meal around a palm-size serve.
- Guard your sleep like it's an appointment. The leptin and ghrelin numbers above are reason enough. Perimenopause makes sleep harder, which makes this more important, not less.
- Work on the stress load, not just the snacks. Cortisol sits upstream of your cravings. Ten minutes of genuine downshift (walk, breath work, sunlight) does more than white-knuckling the pantry.
- Eat real food most of the time. Colourful vegetables, protein, healthy fats, fewer ultra-processed products. Not perfection, just a different default.
- Don't crash diet. Over-restriction is one of the four things that breaks the signals. Regular, adequate meals teach your body it's safe.
- Get personalised help if the signals stay scrambled. Sometimes there's more underneath: insulin resistance, thyroid, iron. That's where personalised nutrition and proper testing earn their keep.
Your appetite isn't the enemy
If you've been treating your hunger as a discipline problem, I hope this post hands you a better explanation. Your appetite hormones respond to how you live, and they can settle. If you'd like to work out which shifts matter most for YOUR body, PerimenoGO is where I walk you through it step by step.
Frequently asked questions
Is constant hunger a sign of perimenopause?
It can be. Oestrogen normally has an appetite-steadying effect, and as it swings and falls in perimenopause, hunger and fullness signals become less reliable. If you're suddenly hungrier on the same meals, that's a recognised pattern, not a character flaw, and it's worth addressing the inputs that amplify it: stress, short sleep and processed food.
Why am I never full after meals?
The usual suspects are a blunted fullness signal (leptin not being heard, often from stress or leptin resistance), meals light on protein, or short sleep the night before. If it's persistent, it's worth checking what sits underneath, like blood sugar and insulin, rather than just eating more and feeling guilty.
Does poor sleep really make you hungrier?
Yes, measurably. In a study of over 1,000 adults, those sleeping 5 hours had around 15% less leptin and 15% more ghrelin than those sleeping 8 hours, independent of body size. Less fullness hormone plus more hunger hormone equals a genuinely hungrier day after a short night.
What is leptin resistance?
It's when your brain stops responding to leptin, the fullness hormone, so your appetite switch stays stuck on. It's more common with more central body fat, chronic stress and a diet heavy in processed food. The way through is lowering those inputs so the signal can be heard again, not harsher dieting.
Do Ozempic-style medications fix appetite hormones?
They mimic one of them. GLP-1 medications copy your gut's natural fullness-and-blood-sugar hormone, which is why they reduce appetite. They don't address leptin, ghrelin, sleep, stress or the reasons the signals scrambled, which is why the foundations still matter, with or without medication.
Can a naturopath help with constant hunger in perimenopause?
Yes. This is bread and butter naturopath territory: working out whether it's appetite hormones, blood sugar, thyroid, iron or sleep driving the hunger, then building a personalised eating and lifestyle pattern that steadies the signals instead of fighting them.
References
- Asarian L, Geary N. Sex differences in the physiology of eating. American Journal of Physiology. 2013;305(11). doi.org
- Taheri S, et al. Short sleep duration is associated with reduced leptin, elevated ghrelin, and increased body mass index. PLoS Medicine. 2004;1(3). doi.org
- Ritland LM, et al. Centrally located body fat is related to appetitive hormones in healthy postmenopausal women. European Journal of Endocrinology. 2008;158(6). doi.org
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