The New Longevity Formula: Why Living Longer Is Not Enough

We've defined longevity in terms of years for a long time now. Just how many more years can we add to our life? Reaching 100 years may be something impressive. But I would argue that we are asking the wrong question.

It would be better to ask the following: What is the answer to how many of those years can we live with good health, strength, independence and quality of life?

Living to the age of 100 is not, however, the same thing as living well until 100.

Thanks to modern medicine we are living in an amazing time. We have witnessed a dramatic increase in life expectancy compared to any earlier times. The inventions of vaccines and antibiotics, sanitation, better medical service and more advancements in surgery were key factors. There is however a difference between being kept alive and remaining a healthy person.

And that difference is what I think we need to talk about when we talk about longevity.

Living longer and living better are two different things.

Imagine two people who both live to 90. One is still walking comfortably, has good muscle strength, can climb stairs, has good cognitive function, sleeps reasonably well and can take care of themselves.

The other spends the last 15 years of their life dealing with multiple chronic conditions, severe loss of muscle, poor mobility and dependence on other people for basic activities.

Technically, both lived to 90. But did they experience the same 90 years?

Of course not.

This is why I think longevity should not simply be about adding years to your life. It should be about adding healthy years to your life.

That means maintaining your physical capacity, metabolic health, muscle mass, brain health, sleep and ability to recover as you age.

In other words, we need to think about healthspan, not just lifespan. And one of the most interesting ways to think about this is something called your fitness reserve.

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Your fitness reserve matters. 

Think about your body as having a reserve capacity.

When you are young and healthy, you have a lot of it. You can climb a few flights of stairs without thinking about it. You can recover from a bad night's sleep. You can deal with physical stress. You can recover after an illness.

As we age, that reserve naturally starts to come down. The problem is when it comes down so far that a relatively small stress can completely overwhelm you.

A fall that a younger person would recover from can become a major event for an older person. A simple infection can lead to a long period of weakness. This is why maintaining physical fitness as you age matters so much.

One measure that gives us useful information about this is VO₂ max, which is essentially a measure of how efficiently your body can use oxygen during exercise. You don't need to become an elite athlete. But maintaining your cardiovascular fitness gives you more capacity to handle the demands of everyday life.

And I think that is a much more useful way to think about exercise.

You are not exercising simply to burn calories.

You are building a reserve.

Muscle is another reserve you cannot afford to ignore. This is one of the biggest mistakes I see people make as they get older. They focus on their weight. They focus on their blood reports. They focus on their medications. But they don't pay enough attention to their muscles.

As we age, we naturally become more vulnerable to losing muscle mass and strength. This condition is known as sarcopenia. 

And muscle is not just about looking fit.

Muscle helps you walk. It helps you climb stairs. It helps you get up from a chair. It helps you maintain balance.

It also plays an important role in glucose metabolism because skeletal muscle is one of the major tissues involved in taking up glucose from the blood.

So when you lose muscle, you are not simply losing something that makes you look strong. You are losing part of your physical reserve.

That is why resistance training becomes increasingly important as we get older. You don't need to train like a bodybuilder. You need to give your body a reason to maintain the muscle it already has.

Your metabolism matters too.

You can look perfectly normal on the outside and still have metabolic problems developing underneath.

Insulin resistance is one example.

Your body can sometimes compensate for insulin resistance for years before your blood glucose becomes obviously abnormal. That is why I don't like looking at a single blood marker and assuming it tells us everything about someone's metabolic health. Your blood glucose, HbA1c, blood lipids, waist circumference, blood pressure and other markers all provide different pieces of information.

The bigger question is: How well is your metabolism actually functioning?

And this brings us back to something I say quite often.

You don't create metabolic health by finding one magical food or one magical supplement. You create it through the overall pattern of your lifestyle.

• Regular physical activity. 

• A diet that provides the nutrients you need. 

• Adequate sleep. 

• Healthy body composition. 

• Managing excess visceral fat. 

And avoiding consistently eating more energy than your body needs.

Sometimes, less really is more

One of the interesting things we can learn from populations known for longevity is that they traditionally did not treat every meal as an opportunity to eat until they were completely full.

The Japanese concept of Hara Hachi Bu is often translated as eating until you are around 80% full. 

I don't think you need to become obsessed with calculating whether you are exactly 80% full. The principle is much simpler.

Don't constantly eat beyond what your body needs.

We live in an environment where food is available almost everywhere, all the time. You can eat breakfast, snack, have lunch, snack again, have coffee and something with it, have dinner and then eat while watching television.

The problem is not one large meal.

It is the repeated pattern.

Your body has to deal with the energy coming in. And if energy intake consistently exceeds what you use, that excess energy has to go somewhere.

Over time, this can contribute to excess body fat, particularly visceral fat around the abdominal organs.

And visceral fat is not simply stored energy. It is metabolically active tissue associated with a range of metabolic problems. So sometimes, one of the simplest longevity strategies is also one of the least exciting:

Don't constantly overeat.

Walk after your meals.

Here's another simple one that I think people underestimate.

Walk. 

Especially after meals. 

You don't need an expensive piece of equipment. You don't need a complicated protocol. Even a short walk after eating can increase muscle glucose uptake and help reduce the rise in blood glucose after a meal.

Think about what your muscles are doing when you walk. They are using energy. And some of that energy comes from glucose. So instead of sitting down immediately after a meal, getting your body moving can be a very simple way of supporting metabolic health.

This is one of those habits that doesn't look impressive on Instagram. But it works with your physiology. And sometimes, those are the habits worth paying attention to. Your gut is part of the longevity conversation.

We are also learning more about the relationship between our gut microbiome and health. Your gut is home to trillions of microorganisms, and the composition of that community is influenced by your diet and lifestyle.

This is one reason I like the idea of dietary diversity.

Different microbes use different components of the foods we eat.

A diet built around a wide variety of plant foods, fiber-rich foods and appropriately chosen fermented foods can support a diverse gut environment. Fermented foods such as yogurt, kefir, kimchi and traditionally fermented vegetables can be useful additions to the diet.

But I don't think we need to turn this into another obsession. You don't need to buy ten different probiotic products.

Start with the basics.

Eat a diverse diet. Eat enough fiber. Include minimally processed foods. And give your gut something to work with.

Sleep is not optional.

I think sleep is probably one of the most underestimated parts of longevity. We treat sleep like something we can sacrifice whenever life gets busy.

“I'll sleep five hours today and catch up on the weekend.” But your body doesn't really work that way.

During sleep, your brain and body go through important processes involved in recovery, memory, hormone regulation and metabolic health. And poor sleep can affect appetite, mood, concentration, physical performance and glucose regulation. 

So if you want to talk about longevity, don't start with a supplement.

Start with your sleep.

Give yourself enough time in bed. Keep your sleeping environment comfortable and dark. Try to maintain a consistent sleep schedule. And pay attention to light exposure. Getting natural light in the morning can help reinforce your circadian rhythm, while excessive bright light late at night can interfere with the body's preparation for sleep.

These are simple things. 

But simple does not mean unimportant. Stress is not always the enemy.

There is an interesting concept in biology called hormesis. The basic idea is that a small, controlled stress can stimulate the body to adapt and become more resilient.

Exercise is a perfect example. You stress the muscles. You recover. The body adapts. You become stronger.

There are other forms of controlled stress that are being studied, including heat exposure and cold exposure. But I want to make an important distinction.

More stress is not automatically better.

The point is controlled stress followed by adequate recovery.

Exercise without recovery can become a problem. Fasting without proper nutrition can become a problem. Extreme heat or cold exposure is not appropriate for everyone.

So don't turn hormesis into another longevity competition. 

The goal is adaptation, not punishment.

Your social life matters too. 

We sometimes talk about longevity as if it is entirely about food, exercise and blood tests.

It isn't.

Human beings are social creatures.

Strong social connections and a sense of belonging are associated with better health outcomes and longevity. You can eat perfectly, exercise every day and have excellent blood reports. But if you are isolated, chronically lonely and have no meaningful connection with other people, that is still a part of your health. This is why I don't want people to think about longevity as a checklist of supplements and biomarkers.

Your relationships matter. Your purpose matters. Your mental well being matters. Your ability to enjoy your life matters.

So what is the new longevity formula?

If you ask me, there isn't one magic formula.

There are a number of boring things that work together.

Build cardiovascular fitness. Maintain muscle. Eat a diverse, nutrient-dense diet. Don't consistently overeat. Keep visceral fat under control. Move after meals. Get enough sleep. Take care of your metabolic health. Maintain meaningful relationships. Give your body appropriate physical challenges and enough time to recover. And don't wait until you are 70 to start thinking about these things.

Because longevity is not something you suddenly start working on when you become old.

It is something you build decades before you need it.

Think of your health like a bank account. Every walk, every strength-training session, every good night's sleep, every nutritious meal and every healthy relationship is a small deposit.

You may not notice the difference tomorrow. But decades later, the balance can look very different. 

And that is why I don't think the goal should be: “How do I live to 100?”

The better question is:

“How do I reach 70, 80, 90 or even 100 with enough physical and mental reserve to actually enjoy being there?” Because living longer is only half the equation.

The real goal is to make more of those years worth living.

And that is what I would call longevity.

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