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“My metabolism has slowed down.” I hear this constantly from women in midlife, and it is not quite right. Metabolism does not simply slow like a dimming light. Several specific things change, each for its own reason, and lumping them together as one vague slowdown is exactly why the usual advice fails.
I am a metabolic scientist, and I want to name the five changes precisely, because once you see them separately, it becomes obvious that each one needs a different response. This is the honest version, grounded in the research on what happens to a woman’s body through the menopause transition.
Change one: you lose muscle, and muscle is where glucose goes
The first shift is a loss of skeletal muscle. As oestrogen declines, muscle maintenance and repair are impaired, and lean mass falls [1].
This matters far more than most people realise, and not for the reason they think. Muscle is one of the main places your body puts glucose. When you have less muscle, you have less capacity to pull sugar out of your blood, which pushes you toward insulin resistance. So muscle loss is not just about strength or shape. It is a metabolic change, because you are losing the tissue that does much of your glucose handling.
Change two: fat moves to your middle
The second shift is a redistribution. Fat that used to sit on the hips and thighs increasingly moves to the abdomen, as visceral fat around the organs [1].
This is not simply cosmetic. Visceral fat is metabolically active in an unhelpful way. It drives inflammation and is closely linked to insulin resistance. The review evidence is clear that for the same total fat, postmenopausal women store more of it viscerally, and this pattern tracks with metabolic risk. So the change in where fat sits is itself a metabolic event, not just a change in the mirror.
Change three: insulin stops working as well
Put the first two together and the third follows. Less muscle to take up glucose, plus more visceral fat driving inflammation, pushes insulin sensitivity down [1]. Your body has to work harder to manage the same blood sugar. This is the engine underneath a lot of the midlife metabolic frustration, and it is why the answer is rarely just “eat less.”
Change four: your cardiovascular protection fades
For most of adult life, oestrogen exerts a broadly protective effect on the cardiovascular system. As it declines, that protection fades, and women’s cardiovascular risk climbs toward the male pattern. This is arguably the most consequential change of the transition, and it reframes which tools matter most, because now cardiovascular training is not optional maintenance, it is central.
Change five: your thermoregulation and stress handling shift
The fifth change is the one that connects to everything I write about. Thermoregulation becomes less stable, which is part of why hot flushes appear. And the stress response often becomes more reactive as the hormonal buffer changes. A body that is less stable in temperature and more reactive to stress is a body that benefits from tools which train exactly those systems.
Why this reframes everything
Seen as one vague slowdown, midlife metabolism feels hopeless. Seen as five specific changes, it becomes a set of solvable problems. Muscle loss has an answer. Visceral fat has an answer. Insulin resistance, cardiovascular risk, and unstable thermoregulation each have answers, and they are not all the same answer.
The honest headline from the research is genuinely encouraging: the review evidence shows that the right interventions can limit the weight gain and reduce the cardiometabolic risk that arise during this transition [1]. This is not a decline to accept passively. It is a transition to work with.
The plate that goes with this
The most important response to a changing metabolism is protecting your muscle, and that starts on your plate. This week’s Søberg® Plate is built for exactly that: salmon, lentils, and roasted vegetables with a yogurt-herb sauce, protein-forward and blood-sugar-steady. The recipe and the science:
Where this goes deeper
Everything above is the why. In the companion piece for members, I go through what moves each of the five changes.
In the full piece you will get answers to:
Why building and keeping muscle is the single highest-leverage thing in midlife, and how it fixes more than one change at once
What the research says reduces visceral fat, specifically
How cold and heat fit in, and which change each one addresses
Why heat becomes a priority tool once cardiovascular protection fades
How to sequence all of this without overwhelming a body that is already changing
If you want the science of midlife metabolism made into a practice, that piece is where it lives.
→ The Midlife Metabolism Practice: What Moves Each of the Five Changes
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Dr. Susanna Søberg, PhD
References
[1] Marlatt KL, Pitynski-Miller DR, Gavin KM, et al. Body composition and cardiometabolic health across the menopause transition. Obesity. 2022;30(1):14-27. doi:10.1002/oby.23289