These are not signs of failure. They are signs of biology, measurable, predictable, and modifiable.
The forties are often when the bill arrives. Not because the body suddenly breaks, but because the small things you have been getting away with start to compound. Sleep that is always a bit short. Stress that never really switches off. Exercise that slowly becomes optional. A bit more alcohol. A bit less protein. Too much sitting. Too few check-ups.
The good news is that most of this is not fixed. The pace of ageing is influenced every day by the choices you make, and that means there is still a lot to work with.
1. Sleeping too little
If you are regularly getting less than seven hours, you are not just tired. You are affecting repair, memory, mood, metabolism and cardiovascular health.
Sleep is when the body does much of its maintenance work. When it is cut short, everything else tends to wobble with it.
What to do: Treat sleep like a health priority. Keep a regular sleep window, protect the hour before bed, and aim for 7 to 9 hours.
2. Living with chronic stress
Stress itself is not the enemy. Chronic stress is. When your nervous system never really settles, it starts to show up in sleep, recovery, appetite, body composition and inflammation.
Many people think they are coping because they are still functioning. But functioning is not the same as thriving.
What to do: Find one stress outlet you will actually stick to, whether that is exercise, walking, therapy, time alone, or something else that genuinely helps.
Photo by Mehmet Guzel
3. Not lifting weights
From the mid-30s onward, muscle starts to decline unless you actively train it. That matters because muscle is not just about appearance. It supports metabolism, bone health, balance, posture and long-term independence.
If you do not use it, you lose it.
What to do: Lift weights two to three times a week. It does not need to be extreme. It needs to be consistent.
4. Training hard and recovering badly
There is a version of discipline that is actually just poor planning. It looks like pushing through, never resting and always going harder. In reality, it usually leads to fatigue, injury and stalled progress.
Recovery is not a reward. It is part of the work.
What to do: Build rest into the plan. Sleep properly, eat enough protein, and respect the fact that recovery needs more attention with age. Supportive tools can have a place here too, but only alongside the basics, not instead of them.
5. Undereating protein
Most busy adults do not eat enough protein to support muscle maintenance and repair.
That becomes more important in midlife, not less. Protein helps preserve lean mass, supports recovery and makes it easier to stay strong and resilient.
What to do: Aim for around 1.6 to 2.0 grams per kilogram of body weight if you are active, and make sure each meal includes a real protein source.
6. Drinking more than you think
Alcohol is one of the easiest habits to underestimate and the hardest to justify. Even regular moderate drinking can disrupt sleep, increase inflammation and slow recovery.
The effects are often subtle at first, which is why people blame ageing rather than the habit.
What to do: Audit what you are actually drinking. If alcohol is a regular part of the week, try reducing it for a few weeks and see what changes.
7. Sitting for most of the day
A one-hour workout does not cancel out eight hours at a desk. Long periods of sitting affect circulation, mobility, metabolism and posture.
This is one of the most overlooked drivers of midlife decline.
What to do: Move more often. Walk, stand, stretch, and break up long stretches of sitting through the day.
8. Skipping health checks
Some of the most important changes in your 30s and 40s happen quietly. Blood pressure, cholesterol, blood sugar and other markers can drift long before you feel unwell.
The problem is not that the body fails silently. It is that many people are not listening.
What to do: Get a proper check-up at least once a year and do the basic bloods that help you see problems early.
Ageing is real. But so is influence. You cannot stop the clock, but you can make sure it runs more slowly than it otherwise would.
Perfection is not the goal. Consistency is. Win the week, and the month starts to look different.
About Professor Harrison Weisinger
Professor Harrison “Dr Harry” Weisinger is a Melbourne-based medical practitioner who works in performance, preventive and longevity medicine. He holds master’s and doctoral degrees in Nutrition and Neuroscience, and has worked with world tour professional cyclists, national champion triathletes, title-holding MMA fighters, Olympians and AFL Hall of Famers. He is the founder of My Performance Doctor and co-founder of KURK Biosciences.
Disclosure KURK Biosciences is an Australian health and bioscience company specialising in plant-based, science-backed nutritional solutions. KURK Liquid Curcumin uses proprietary micellar technology and is doctor-formulated, independently lab-tested and 100% plant-based. Always consult your healthcare practitioner before starting any new supplement, especially if you have a chronic condition or take prescription medication.
These are not signs of failure. They are signs of biology, measurable, predictable, and modifiable.
The forties are often when the bill arrives. Not because the body suddenly breaks, but because the small things you have been getting away with start to compound. Sleep that is always a bit short. Stress that never really switches off. Exercise that slowly becomes optional. A bit more alcohol. A bit less protein. Too much sitting. Too few check-ups.
The good news is that most of this is not fixed. The pace of ageing is influenced every day by the choices you make, and that means there is still a lot to work with.
1. Sleeping too little
If you are regularly getting less than seven hours, you are not just tired. You are affecting repair, memory, mood, metabolism and cardiovascular health.
Sleep is when the body does much of its maintenance work. When it is cut short, everything else tends to wobble with it.
What to do: Treat sleep like a health priority. Keep a regular sleep window, protect the hour before bed, and aim for 7 to 9 hours.
2. Living with chronic stress
Stress itself is not the enemy. Chronic stress is. When your nervous system never really settles, it starts to show up in sleep, recovery, appetite, body composition and inflammation.
Many people think they are coping because they are still functioning. But functioning is not the same as thriving.
What to do: Find one stress outlet you will actually stick to, whether that is exercise, walking, therapy, time alone, or something else that genuinely helps.
3. Not lifting weights
From the mid-30s onward, muscle starts to decline unless you actively train it. That matters because muscle is not just about appearance. It supports metabolism, bone health, balance, posture and long-term independence.
If you do not use it, you lose it.
What to do: Lift weights two to three times a week. It does not need to be extreme. It needs to be consistent.
4. Training hard and recovering badly
There is a version of discipline that is actually just poor planning. It looks like pushing through, never resting and always going harder. In reality, it usually leads to fatigue, injury and stalled progress.
Recovery is not a reward. It is part of the work.
What to do: Build rest into the plan. Sleep properly, eat enough protein, and respect the fact that recovery needs more attention with age. Supportive tools can have a place here too, but only alongside the basics, not instead of them.
5. Undereating protein
Most busy adults do not eat enough protein to support muscle maintenance and repair.
That becomes more important in midlife, not less. Protein helps preserve lean mass, supports recovery and makes it easier to stay strong and resilient.
What to do: Aim for around 1.6 to 2.0 grams per kilogram of body weight if you are active, and make sure each meal includes a real protein source.
6. Drinking more than you think
Alcohol is one of the easiest habits to underestimate and the hardest to justify. Even regular moderate drinking can disrupt sleep, increase inflammation and slow recovery.
The effects are often subtle at first, which is why people blame ageing rather than the habit.
What to do: Audit what you are actually drinking. If alcohol is a regular part of the week, try reducing it for a few weeks and see what changes.
7. Sitting for most of the day
A one-hour workout does not cancel out eight hours at a desk. Long periods of sitting affect circulation, mobility, metabolism and posture.
This is one of the most overlooked drivers of midlife decline.
What to do: Move more often. Walk, stand, stretch, and break up long stretches of sitting through the day.
8. Skipping health checks
Some of the most important changes in your 30s and 40s happen quietly. Blood pressure, cholesterol, blood sugar and other markers can drift long before you feel unwell.
The problem is not that the body fails silently. It is that many people are not listening.
What to do: Get a proper check-up at least once a year and do the basic bloods that help you see problems early.
Ageing is real. But so is influence. You cannot stop the clock, but you can make sure it runs more slowly than it otherwise would.
Perfection is not the goal. Consistency is. Win the week, and the month starts to look different.
About Professor Harrison Weisinger
Professor Harrison “Dr Harry” Weisinger is a Melbourne-based medical practitioner who works in performance, preventive and longevity medicine. He holds master’s and doctoral degrees in Nutrition and Neuroscience, and has worked with world tour professional cyclists, national champion triathletes, title-holding MMA fighters, Olympians and AFL Hall of Famers. He is the founder of My Performance Doctor and co-founder of KURK Biosciences.
Disclosure
KURK Biosciences is an Australian health and bioscience company specialising in plant-based, science-backed nutritional solutions. KURK Liquid Curcumin uses proprietary micellar technology and is doctor-formulated, independently lab-tested and 100% plant-based. Always consult your healthcare practitioner before starting any new supplement, especially if you have a chronic condition or take prescription medication.
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