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Why Low-Carb, Keto, and Fasting Aren’t the Answer for Peri/Menopausal Fat Loss and Metabolic Health

Writer's picture: Juanita Cantu OstremJuanita Cantu Ostrem

When navigating the hormonal shifts of perimenopause or adjusting after years of restrictive dieting, carbs often get a bad rap. But what if I told you that, instead of being the villain in your fat loss journey, carbs could actually be one of your greatest allies for both energy and metabolic health?

Here’s where many women go wrong:


❌ Doubling down on excessive cardio

❌ Striving for perfection with stricter rules

❌ Pushing through intense HIIT workouts

❌ Slashing calories even more

❌ Cutting carbs to the bare minimum


While these strategies may have worked in the past, they often backfire during perimenopause or after long-term dieting. Why? Because they add even more stress to an already overstressed system.


The Unique Challenges of Perimenopause and Metabolic Shifts

As you approach perimenopause, or after a history of chronic dieting, your body becomes more sensitive to stress. This isn't just about feeling frazzled – it affects your hormones and metabolism in a major way.

Elevated cortisol (the stress hormone) becomes the norm. This not only disrupts blood sugar levels but also impacts sleep, creating a cycle of increased stress, insulin resistance, and metabolic imbalance. In this phase, your body’s main priority is energy conservation, meaning your metabolism is primed to hold onto fat rather than burn it. On top of that, plummeting estrogen and progesterone remove your body’s natural ability to buffer stress, intensifying the effects of cortisol.

The result? Increased belly fat and a shift toward an “apple shape” – a stubborn type of fat gain that’s hard to reverse.


The Carb Myth: Why Low-Carb Diets Don’t Work for Women Over 40

Here’s where low-carb diets and extreme fasting strategies often fail. Cutting carbs too drastically exacerbates the hormonal imbalances you're already dealing with. Carbs are crucial for balancing hormones and supporting your thyroid function. When carb intake is too low, your body struggles to convert T4 (inactive thyroid hormone) to T3 (active thyroid hormone), which can slow down metabolism.


More than that, carbs play a vital role in stabilizing blood sugar and preventing cortisol spikes. While some may experience short-term improvements in insulin resistance with low-carb diets, the long-term stress and low energy intake can actually reduce insulin sensitivity, regardless of carb consumption.

And, let’s not forget how carbs impact sleep. Consuming a moderate amount of carbs (including a serving of berries in your last meal) supports serotonin production, which improves both your mood and sleep quality. Better sleep means better recovery and better fat loss.


The Smarter Approach to Fat Loss and Hormonal Balance

If you’re in perimenopause or dealing with metabolic issues, your approach to fat loss needs to be more balanced and sustainable. It’s not about pushing your body harder; it’s about working smarter. Here’s what you should focus on instead:


✔️ Reduce stress – Your body is already under enough pressure, so your lifestyle should aim to reduce additional stress wherever possible.

✔️ Prioritize hormonal balance – Focus on supporting your hormones, especially estrogen and progesterone, to help regulate stress and improve metabolism.

✔️ Include enough carbs – Carbs are vital for thyroid function, blood sugar stability, and overall energy levels. You don’t need to eliminate them to lose fat; you need to eat them wisely.

A balanced intake of carbs, paired with adequate protein, will not only help you manage stress but also support muscle growth, strength, and recovery. Plus, it's a sustainable long-term strategy that’s much kinder to your metabolism than extreme approaches like keto or fasting.


Forget the Outdated Advice – Your Body Deserves a Smarter Strategy

It's time to leave behind the outdated dieting advice that fails to account for the unique needs of women over 40. Low-carb, keto, and extreme calorie deficits simply don’t work for perimenopause or metabolic adaptation, and they never will.

Instead of pushing harder, start working smarter. Your body isn’t asking for stricter rules or more stress. It’s asking for balance, support, and patience. With the right approach, you can achieve lasting fat loss, hormonal harmony, and better overall health.



Have You Tried Low-Carb, Keto, or Fasting?

What’s been your experience with low-carb diets, keto, or fasting? Have you noticed challenges or setbacks? Share your thoughts in the comments – let’s keep the conversation going!

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