Fatigue After 40 Demystified

Fatigue After 40 Demystified

Fatigue after 40 is common but not normal. Fatigue is NOT the price you must pay for being busy or successful! 

If you miss dearly your vitality from your 20s and you push through all day because you believe “that’s normal when being busy” or “it is expected as we age”, let’s demystify chronic tiredness over 40.

Feeling tired is feedback from your brain and body. And yet when you lose energy, you tend to blame it on children, general busyness, life circumstances and more.

 Our modern lifestyle depletes more than it restores. And unprecedented expectations force us to push through the fog of low energy. That’s how we end up relying on caffeine and sugar to keep tiredness at bay.

The problem is that relying on these quick-fix masks the fact that your cellular energy system is in crisis And you never stop to find out why.

Fatigue over 40 is often caused by a lack of flexibility. Not physical flexibility – even if it’s beneficial for optimum vitality – but metabolic flexibility.

Your metabolic flexibility is the capacity of your body to maintain its energy production in times of calorie excess or restriction and of low or high energy demand. 

This metabolic flexibility has to do with your food patterns. Your meal content AND your meal frequency. And this flexibility declines over time. Hence most women over 40 feel flat or fatigued.

Understanding fatigue to overcome fatigue

The cornerstone of your energy system is your mitochondria – the energy-producing organelles in your body. And your mitochondria have their agenda. When they feel overwhelmed, they slow down, leaving you flat and energy poor.

Once you start composing mitochondria-friendly meals and you pace your meals, you retrain your mitochondria to be metabolically flexible. 

Once your body is metabolically flexible it will be easier for you to lose weight, build lean muscle mass, get better sleep, and feel energized throughout your day. And you stop feeling “hangry” as a bonus.

The good news is it is easy to become metabolically flexible. And there are many ways to introduce the protocol that is adapted to your taste and your lifestyle.

This is exactly why I have designed the Vitality After 40 system. This is not a diet or a quick fix. This is a lifestyle and a very simple way to live based on four pillars: Food, Fast, Mindfulness and Movement for optimum vitality after 40.


Sugar is the enemy of stable energy. You’ve probably heard that before. The problem is that your brain craves sugar for a quick fix. Over time it depletes your dopamine reward pathway. And you end up wanting more sugar, more often. The key to stable energy during the day is to examine the content of your meals. 


Your vitality relies as much on when you eat as what you eat. There is a perfect orchestration in the way your body uses different food sources to produce energy. By eating all day long you create dissonance. Progressively, your body gets accustomed to using the food sources the most readily available. That’s how you lose your metabolic flexibility.


Stop driving at high speed in low gear! You use up all the energy you produce too soon and end up low on fuel quicker. Mindfulness brings your attention to these little moments when you can pause and start again more refreshed. Press pause, and breathe.


Move when you feel tired. It is completely counterintuitive and yet very powerful. Your mitochondrial cellular respiration – the source of energy production in your body and brain – increases as you move. Staying in bed or lying on the couch may make you feel more fatigued at the end. The key is to adapt your physical activity to your energy level.

📢 I’ve created for you a cheat sheet with my top tips to FORGET FATIGUE AFTER 40. It’s free and it’s one click away!

This blog is meant to educate and should not be used as a substitute for personal medical or psychological advice. The reader should consult his or her physician or clinician for specific information concerning specific medical conditions. All reasonable efforts have been made to ensure the information presented is accurate, however, new findings may supersede some information presented. As every single individual circumstances will be different, no individual results should be seen as typical.