When women approach perimenopause and menopause, I often hear a similar comment from clients in our St. Louis nutrition practice:
“Pretty sure my metabolism is broken.”
It usually comes from the frustration of watching your body change:
- without your permission, and
- despite eating and exercising the same way you always have.
So what’s really happening? Is menopause slowing your metabolism? Or is something else going on?
The latest research offers a more nuanced perspective—one that challenges long-held beliefs about metabolism and aging while helping explain why body composition changes can feel so dramatic during perimenopause and menopause.
What Is Metabolism, Exactly?
At its core, metabolism refers to the process by which your body converts food and beverages into energy. Your total daily energy expenditure comes from three main areas:
Basal Metabolic Rate (BMR)
The energy your body uses at rest to keep you alive and functioning—breathing, circulating blood, regulating body temperature, and supporting organ function.
Activity Thermogenesis
Calories burned through exercise and everyday movement.
Thermic Effect of Food
Energy required to digest, absorb, and metabolize food.
Your basal metabolic rate accounts for the largest percentage of calories burned each day. So when people say their “metabolism has slowed down,” they’re usually referring to changes in BMR.
Does Metabolism Really Slow Down During Menopause?
For years, experts believed metabolism steadily declined with age. However, a landmark 2021 study published in Science found that metabolic rate remains relatively stable from ages 20 to 60. Significant declines tend to occur after age 60.
This means that menopause itself may not dramatically “break” your metabolism—but hormonal shifts during perimenopause and menopause can absolutely influence:
- body composition,
- appetite,
- insulin sensitivity,
- muscle mass, and
- fat distribution.
In other words, your body is changing—but not necessarily because your metabolism suddenly stopped working.
Why Body Changes Happen During Perimenopause and Menopause
1. Increased Visceral Fat Storage
Estrogen helps regulate where fat is stored in the body. As estrogen declines during menopause, women often experience an increase in visceral fat—the deeper abdominal fat surrounding internal organs.
This shift toward central weight gain can increase the risk for:
- cardiovascular disease,
- insulin resistance,
- inflammation, and
- metabolic conditions.
2. Increased Insulin Resistance
Lower estrogen levels can reduce insulin sensitivity, making it harder for the body to regulate blood sugar efficiently.
This may lead to:
- higher blood sugar spikes after meals,
- increased cravings,
- energy crashes, and
- easier fat storage over time.
3. Hunger and Fullness Signals Change
Estrogen also influences appetite-regulating hormones like leptin. During perimenopause and menopause, women may notice:
- increased hunger,
- reduced fullness cues,
- stronger cravings, and
- changes in eating patterns.
This isn’t a lack of willpower—it’s biology.
4. Loss of Muscle Mass
Starting around age 30, women naturally lose muscle mass over time. During menopause, declining estrogen can accelerate this process by reducing muscle protein synthesis.
Muscle loss matters because muscle supports:
- strength,
- mobility,
- metabolic health,
- blood sugar regulation, and
- healthy aging
How to Support Your Body During Menopause
The good news? There are evidence-based strategies that can help support your body through the menopause transition.
Prioritize Strength Training
Strength training is one of the most effective tools for preserving and building lean muscle mass during perimenopause and menopause.
Aim for resistance training 2–3 times per week. If appropriate for your fitness level, don’t be afraid to gradually increase resistance over time.
Benefits include:
- improved strength,
- better bone health,
- improved insulin sensitivity,
- enhanced body composition, and
- support for long-term healthy aging.
Eat Enough Protein
One of the biggest mistakes I see women make during menopause is drastically cutting calories when body changes begin.
Undereating—especially inadequate protein intake—can contribute to further muscle loss and decreased energy levels.
Protein supports:
- muscle maintenance,
- satiety,
- recovery,
- blood sugar balance, and
- healthy aging.
Support Sleep Hygiene
Sleep disruption is incredibly common during perimenopause and menopause.
Night sweats, hot flashes, and early waking can all affect:
- appetite regulation,
- mood,
- energy,
- recovery, and
- overall health.
While you may not be able to control every sleep disruption, supporting healthy sleep habits can still make a meaningful difference:
- maintain a consistent bedtime,
- create a calming nighttime routine,
- reduce late-night screen exposure,
- and prioritize rest whenever possible.
Stabilize Blood Sugar
Balanced meals can help reduce energy crashes and support blood sugar regulation during menopause.
A few simple strategies:
- choose fiber-rich carbohydrates like fruits, vegetables, legumes, and whole grains.
- pair carbohydrates with protein or healthy fats,
- avoid long gaps between meals
Curious About Your Metabolism? Resting Metabolic Rate (RMR) Testing Can Help
Many women in perimenopause and menopause wonder whether their metabolism has actually changed. At McDaniel Nutrition Therapy in St. Louis, we offer Resting Metabolic Rate (RMR) testing using the BodyGem® metabolic analyzer to help take the guesswork out of calorie needs.
RMR testing measures how many calories your body burns at rest, providing personalized data that can help guide nutrition recommendations during menopause. Rather than relying on online calculators or restrictive dieting, this testing allows for a more individualized approach to:
- weight management,
- muscle preservation,
- energy needs,
- and long-term metabolic health.
For women navigating hormonal changes, having objective data can be both empowering and reassuring.
The Bottom Line
If you feel like your body has changed during perimenopause or menopause, you’re not imagining it.
But your metabolism probably isn’t “broken.”
Hormonal shifts during menopause can influence body composition, hunger, muscle mass, and insulin sensitivity in ways that make maintaining your usual routines feel more challenging. The key is shifting your focus from restriction to support.
With the right nutrition, strength training, sleep habits, and individualized guidance, women can absolutely feel strong, energized, and healthy during this phase of life.
If you’re looking for personalized nutrition support for perimenopause or menopause in St. Louis, the dietitians at McDaniel Nutrition Therapy can help create a realistic, sustainable plan tailored to your body and goals.