Eating for a Longer Life

Longevicals, Eating for a Longer Life

10+1 rules at a glance

This is the summary to stick on your fridge door. Tap a rule name to jump to the details.

Longevicals, Eating for a Longer Life (2026). This printout gives general information and does not replace personal medical advice. If you have a chronic condition, take medication, or are pregnant or breastfeeding, consult your physician.

Introduction: Why Do You Need a Nutrition Guide?

Most diets focus on one thing: losing weight. Some people want to look good on the beach in summer, others want to drop a dress size. These are understandable goals, but the science of ageing asks a different question: what will happen to your cells in 20 years?

Ageing research has picked up a lot of speed in the last decade. Studies published in 2024-2025, such as cohort data covering hundreds of thousands of participants, controlled clinical trials and meta-analyses, describe the link between nutrition and biological ageing in detail. This guide brings those findings together.

Let us be clear from the start: this guide is not a "diet programme". We are not asking you to count calories, track macros or commit to a particular eating philosophy. Instead, we bring together the parts of different eating traditions that have the strongest scientific support, from the Mediterranean diet to Okinawan cooking and from intermittent fasting to plant-based eating.

There are 10+1 rules in total. Each one rests on scientific studies (sources are at the end of the page) and each one tells you in concrete terms what to do. The rules are independent of each other, so you do not have to follow them in order. Adding just two of them to your life today is a good start.

The Science: What Speeds Up Ageing?

Before we get to the rules, let us look at why they work. Knowing the reason makes the rules easier to follow. Modern ageing science shows that ageing is the sum of several linked biological mechanisms. The "Hallmarks of Aging" paper, published in the journal Cell in 2013 and updated in 2023, describes these mechanisms in 12 categories. Nutrition is directly linked to at least seven of these 12 hallmarks.

Target:Make half your plate vegetables. Choose foods with a glycaemic load under 10.

The Problem: Why Is Starch the Metabolic Engine of Ageing?

Bread and pastries made from white flour, pasta, potatoes and white rice form the base of much of Turkish cooking. These foods are tasty, cheap and filling, but from the point of view of ageing biology they share one problem: they turn into glucose quickly. (Breads made from wholewheat, rye or wholegrain flours fall outside this category. They are a healthy carbohydrate choice.)

When blood sugar rises, the body releases insulin. This is a normal, healthy process. The problem is that starch loads repeated throughout the day keep insulin levels high all the time. Insulin that stays high sets off a chain reaction. The mTOR pathway stays active, autophagy (the cellular clean-up process) stops, inflammation rises and insulin resistance develops. All of these are early signs of metabolic syndrome.

Metabolic syndrome, made up of belly fat, high blood pressure, impaired blood sugar and an abnormal lipid profile, is a picture associated with many chronic health problems. At the centre of it sits the refined starch we eat without even noticing.

The Solution: What Should You Swap It For?

We are not suggesting you cut starch out of your life. What we suggest is changing the ratio a lot. Filling half your plate with vegetables is one of the easiest ways to bring down the glycaemic load of a meal.

Practical swaps: a good start to the morning is an omelette cooked in olive oil with 1 slice of wholewheat or rye bread. Another option is 2 boiled eggs with a slice of wholegrain bread topped with avocado. Avoid meals made only of carbohydrate with no protein. If you prefer porridge or chia pudding, add some protein to it (eggs, yoghurt, nuts). At lunch, quinoa, bulgur or cauliflower rice instead of rice. At dinner, lentil or chickpea pasta instead of regular pasta. Sweet potato (it has a lower glycaemic index) or root vegetables instead of potatoes.

It helps to know that not all carbohydrates are the same. The complex carbohydrates in wholegrains, pulses and vegetables contain fibre, affect blood sugar slowly and feed the microbiome. The real problem is refined, simple starch with the fibre stripped out.

Target:Eat the right amount of protein per kilo for your age (table below). Make pulses, tofu and tempeh the main source.

The Protein Paradox: A Balance That Depends on Age

On protein, ageing science and the fitness world say different things. The fitness message is simple: more protein is better. Ageing research paints a far more complicated picture.

A study by Levine and colleagues, published in Cell Metabolism, found an age-dependent paradox between protein intake and mortality. Among people aged 50-65 who got more than 20% of their calories from protein, the risk of death from all causes was 75% higher and the risk of cancer death 4 times higher. Over 65, the same high protein intake showed the opposite relationship: the risk of death was 28% lower and the risk of cancer death 60% lower.

Why? In middle age, a lot of animal protein keeps the IGF-1 and mTOR pathways chronically switched on. These pathways are needed for growth and repair, but when they stay overactive they increase cell proliferation and with it the risk of cancer. Over 65 the picture flips: muscle loss (sarcopenia) becomes the main concern, and enough protein plays an important role in keeping muscle mass.

The Okinawa Lesson: Protein in a Region Known for Long Lives

Okinawa is one of the places in the world with the most people over 100. The first reaction to the traditional Okinawan diet is surprise: only 9% of its calories come from protein and 85% from carbohydrate. This protein-to-carbohydrate ratio of about 1:10 matches the ratio found best for long life in animal models (low protein, high carbohydrate).

The main protein sources in Okinawa are soya foods (tofu, miso) and small amounts of fish. Red meat intake is very low. One more striking point: although the Okinawan diet is low in protein, sarcopenia rates among older Okinawans are low compared with other developed countries. The likely reason is that a low but sufficient intake of plant protein, combined with regular physical activity, is enough to keep muscles going.

Plant or Animal?

One more detail from the Levine study: the protein-mortality link seen in middle age came mainly from animal protein. When the protein came from plants, the rise in mortality largely shrank or disappeared, even at the same high intake.

Here it helps to separate the effects of red meat and white meat. Red meat (beef, lamb, veal) contains more saturated fat and more BCAAs (branched-chain amino acids), leucine in particular. Leucine is one of the main dietary signals that switch on mTOR. mTOR that stays chronically active is associated with the biology of ageing. White meat (chicken, turkey) contains less saturated fat than red meat and is a more acceptable choice in moderate amounts. Plant proteins are generally lower in BCAAs. So plant proteins stimulate mTOR less, which is an advantage for longevity.

In practice: make pulses (lentils, chickpeas, beans), tofu and tempeh your main protein source, a handful at every meal. Fish is a category of its own: 2-3 portions of oily fish a week provide both protein and omega-3. Eat white meat (chicken, turkey) in moderation. Keep red meat to 1-2 portions a week and stay away from processed meats (sausages, pastrami, sucuk, a spicy Turkish sausage) as much as you can.

Target:Eat 2-3 portions of oily fish a week. Keep red meat to no more than 1-2 portions a week.

Red meat is an emotional subject. People have eaten meat for hundreds of thousands of years, and in many cultures it has been a symbol of eating well. We cannot ignore that. Still, it is worth noticing that the meat of animals our ancestors hunted has almost nothing in common with the meat of today's industrially raised livestock. The fat profile and the omega-3/omega-6 ratio were different, and there were no additives. Our ancestors also ate a very small fraction of what we eat today. What really matters is the quality of the meat, how often it is eaten and how it is cooked.

High red meat intake is associated with several processes linked to the biology of ageing. Its high haem iron content increases oxidative stress. The gut microbiome turns the L-carnitine in red meat into TMAO, a marker that research is watching closely. Cooking at high temperatures (grilling, frying) produces heterocyclic amines and polycyclic aromatic hydrocarbons. Health authorities recommend reducing exposure to these compounds. Processed meat intake is also associated in research with poorer health outcomes.

Oily fish is a different story. Salmon, mackerel, sardines, anchovies and herring are the richest food sources of long-chain Omega-3 fatty acids (EPA and DHA). DHA contributes to the maintenance of normal brain function.* DHA contributes to the maintenance of normal vision.* (The claims apply with a daily intake of 250 mg DHA.) EPA has no authorised health claim on its own.

In practice: aim for at least 2-3 portions of oily fish a week. When choosing fish, small fish (sardines, anchovies, mackerel) build up fewer heavy metals than large ones (tuna, swordfish). Cut red meat down to 1-2 portions a week and avoid processed meats as much as you can.

Target:1-3 cups of coffee a day. Drink the first cup 90-120 minutes after waking and the last at least 10 hours before sleep.

Hydration gets less attention than almost anything else in longevity discussions. Yet chronic mild dehydration is far more common than you might think, and it affects kidney function, cognitive performance and even blood pressure. Most people do not even notice it.

Coffee: A Longevity Drink Where Timing Matters

Moderate coffee intake of 1-3 cups a day has been consistently linked with a lower risk of death in large epidemiological studies. Caffeine alone does not explain the link. Coffee is one of the richest food sources of polyphenols, chlorogenic acid and antioxidants. A similar link is seen with decaffeinated coffee.

Tea: EGCG and Beyond

Green tea has become a favourite of longevity research thanks to its EGCG (epigallocatechin gallate). EGCG is a polyphenol whose relationship with pathways studied in ageing biology, such as AMPK, mTOR and autophagy, is being researched. White tea is less processed and can contain even more EGCG than green tea.

Herbal teas add variety too: chamomile, ginger and turmeric (with a pinch of black pepper) are among the most researched herbal teas.

Smoothies: An Easy Route to Plant Variety

A daily vegetable and fruit smoothie is one of the easiest ways to reach the goal of 30+ different plants a week (see Rule 6). Add spinach, avocado, blueberries, ginger, flaxseed and almond milk to a smoothie and you have had 6-7 different plants in one go. Keep the fruit share low (because of the sugar) and let greens and seeds lead.

Target:Stop eating when your stomach is 80% full. Women who want to try fasting can start with 14:10.

Calorie restriction is one of the oldest and most consistent findings in ageing research. In yeast, worm and rodent models, cutting calories by 20 to 40 per cent has been associated with favourable changes in markers linked to ageing. Research in humans is ongoing. In this mechanism, cells that sense a shortage of food switch from growth to maintenance. Autophagy kicks in, DNA repair speeds up and inflammation falls.

Human data is pointing the same way. Research published in 2025 gave the first direct evidence that intermittent time-restricted eating (iTRE) increases autophagic flux in humans. In a randomised controlled trial with 121 participants with obesity, 6 months of iTRE increased autophagic flux by a statistically significant amount compared with standard care (P = 0.04). This matters, because for many years the link between fasting and autophagy in humans rested largely on inferences from animal data.

Practical Approaches

Target:More than 30 different plants a week. At least 5 of them should be different grains or pulses.

The American Gut Project, published in 2018, is the largest citizen science project on the gut microbiome: more than 10,000 participants in 45 countries. Its most striking finding was that people who ate more than 30 different plant types a week had a far more diverse gut microbiome than those who ate fewer than 10. The difference in molecular alpha diversity was highly statistically significant (P = 4.17 × 10⁻¹⁹⁷).

Why does this matter so much? Because a diverse microbiome is associated with strong immunity, lower inflammation, better metabolic health and even better mood. In people eating 30+ plants, beneficial species such as Faecalibacterium prausnitzii and Oscillospira were significantly more abundant. These bacteria produce short-chain fatty acids (SCFAs). Butyrate in particular plays a role in the integrity of the gut lining, and its anti-inflammatory effects are being researched.

How Do You Make 30 Plants Easy? A Practical Counting Guide

• Each plant type counts separatelyRed pepper, green pepper and yellow pepper = 3 different plants. Broccoli and cauliflower = 2 different plants. White onion and red onion = 2 different plants.
• Spices Count 1/4Turmeric, cumin, thyme, basil, parsley and dill each count as 1/4. Even a pinch adds to variety.
• Form Does Not MatterFrozen, tinned or fresh, they all count. What matters is variety, not the form of the food. Frozen fruit is usually flash-frozen when its nutritional value is at its highest.

A 2021 study by Stanford microbiome researchers backed up these findings: in the group that ate fermented foods regularly for 10 weeks, microbiome diversity rose and inflammation markers fell. The more interesting finding was that in the high-fibre group, microbiome diversity did not rise in the same way even though fibre intake went up. The researchers suggest the likely reason is that the microbiome needs to meet a wide range of foods. Healthy eating that is always the same works less well than healthy eating with variety.

A practical strategy: plan variety at the start of the week. Buy vegetables and fruit in different colours at the market. Nature's colour coding usually points to different phytonutrients (antioxidants, flavonoids, carotenoids). Eat at least 5 different grains or pulses a week (rice, bulgur, quinoa, oats, red lentils, green lentils, chickpeas). Stock your spice cupboard with turmeric, cumin, thyme, chilli flakes, cinnamon, ginger, black pepper and sumac. Each one adds 1/4 point to your weekly count.

Target:Do not guess, measure with a blood test. Vitamin D, magnesium, B12 and ferritin come first.

Even a balanced way of eating can fall short on some micronutrients. Modern farming has reduced the mineral content of soil, indoor living has cut vitamin D synthesis and food processing has removed many nutrients. Measure your gaps instead of guessing them. The most reliable way to do this is a blood test.

Target:At least 1 portion of fermented food a day. Vary the types across the week.

Fermentation is one of the oldest ways of preserving food in human history, and modern science is now studying these foods for their effect on the gut microbiome.

A 2021 study by Stanford University's microbiome researchers, published in the journal Cell, showed the effect of fermented foods on the gut microbiome in a controlled setting for the first time. In the group that ate fermented foods every day for 10 weeks, microbiome diversity rose significantly and four of 19 inflammation markers (IL-6, IL-10, IL-12b and TNF-alpha) fell significantly.

An interesting comparison: in the same study, the group on a high-fibre diet did not see a similar rise in microbiome diversity. This suggests that, as well as fibre, the direct contribution of live microorganisms plays a part in the effect of fermented foods.

A Practical Guide to Fermented Foods

• Naturally fermented pickles (made in brine):The fermented food closest to Turkish cooking. This means pickles made by lactic acid fermentation (in salt water). Vinegar pickles do not belong in this group. Lactic acid pickles contain live Lactobacillus bacteria. Homemade pickles are a good choice, because most shop-bought pickles are pasteurised and contain no live bacteria.
• Kefir and natural yoghurt:Kefir contains a much wider range of bacteria and yeast species than yoghurt (30-50 species against 2-7 in yoghurt). Natural yoghurt is valuable too, but most shop-bought yoghurts contain sugar and additives. Choose plain, unsweetened and, if possible, homemade ones.
• Other options:Kimchi (Korean fermented cabbage, contains live bacteria), kombucha (fermented tea, watch the sugar), miso (Japanese soya paste, for soups and sauces), tempeh (fermented soya, a complete protein source), natto (fermented soya, the richest source of K2, but its taste is not for everyone).

Practical target: at least 1 portion of fermented food a day. Instead of eating the same fermented food every day, rotate different types across the week. That way different kinds of bacteria reach your table too.

Target:Zero is ideal. If you drink, stay within 1 unit a day and have several alcohol-free days a week.

This is the shortest section of the guide, but perhaps the most important. For years we have heard that "a glass of red wine is good for the heart". Since 2023, assessments published by international health authorities have not backed this message.

In a statement published in January 2023, the World Health Organization (WHO) said "No level of alcohol consumption is safe for our health." Alcohol (ethanol) is classified as a Group 1 carcinogen by the International Agency for Research on Cancer (IARC). This classification is not new, but it is not widely known.

Ethanol is converted into acetaldehyde in the body. Acetaldehyde is a compound that can damage DNA and cause mutations. This effect is not limited to the liver. It is also seen in other parts of the digestive system, such as the mouth, throat, oesophagus, stomach and bowel. In IARC assessments, alcohol has been linked with at least 7 types of cancer: mouth, throat, oesophagus, larynx, bowel, liver and breast cancer.

According to data from the WHO European Region, 50% of alcohol-related cancers come from drinking levels described as "light" or "moderate" (less than 1.5 litres of wine or less than 3.5 litres of beer a week). Canada updated its alcohol guidance in 2023: drinking more than 2 units a week is now considered "risky".

The ALDH2 genetic variant matters too. This variant, common in people of East Asian origin, lowers the activity of the enzyme that breaks down acetaldehyde. Acetaldehyde can then build up in the body 4-5 times faster, and people who carry the variant can be affected more even by small amounts of alcohol. ALDH2 variant prevalence in Türkiye is not as high as in East Asia, but individual differences in metabolism should not be ignored.

The practical approach: the ideal is to stop drinking alcohol altogether. If that does not feel realistic: plan several alcohol-free days a week, stay within 1 unit a day, drink alcohol with food on the days you do drink, and drink water in between. Be sceptical of any source that recommends "a glass of wine for your health". Current scientific assessments do not back this advice.

Target:Choose plain and unsweetened. Goat and sheep products and moderate amounts of cheese cause fewer problems.

We all grew up with the message "drink milk for healthy bones". From the point of view of ageing biology, the picture is far more complex.

Think about the biological purpose of milk: to take a calf to hundreds of kilos in a few months. By nature it is a growth fluid. Cow's milk raises IGF-1 levels and activates the mTOR pathway. It also contains galactose. Interestingly, galactose is also the sugar given to animals in the laboratory to create a model of accelerated ageing.

The epidemiological data is mixed, but positive correlations have been reported between high milk intake and some types of cancer (prostate cancer in particular) and neurodegenerative diseases (Parkinson's). On the other hand, milk is a rich source of calcium and protein.

What Should You Do?

You do not have to cut out milk completely, but it is important to make a conscious choice. Plant-based alternatives: there is one thing to watch with ready-made plant milks. In most products on the market, such as almond milk and coconut milk, the share of the main ingredient is very low and the share of additives and sugar is high. Healthier alternatives can be: making your own plant milk at home (very easy with almonds, oats or coconut), or choosing plant milk concentrates or capsule forms. If you buy ready-made, always choose plain, unsweetened versions and check the ingredients list. Pea protein milk (high protein) and hemp milk (omega-3 and omega-6 balance) are relatively cleaner options.

Goat and sheep milk products show lower IGF-1 activity than cow's milk and, thanks to their A2 casein structure, are better tolerated in digestion. Cheese causes fewer problems than milk because galactose and lactose levels fall during fermentation. Moderate cheese intake is generally acceptable.

You can meet your calcium needs from non-dairy sources: dark green leafy vegetables (broccoli, spinach, chard, rocket), sesame and tahini, almonds, sardines (eaten with their bones), fortified plant milks. Vitamin D contributes to normal absorption and utilisation of calcium and phosphorus.* If you are thinking about a vitamin D or K2 supplement, consult your physician or pharmacist.

Target:If the label lists more than 5 ingredients or things you do not recognise, put it back on the shelf. Start with 1 UPF-free day a week and add more.

This rule is called a "bonus", but if you look at the 2024-2025 data it may be the most important of all 11 rules. Ultra-processed foods (UPF) have become one of the most closely watched topics in nutrition research in recent years.

What Do the Numbers Say?

• 2025 Systematic Reviews Meta-Analysis:(18 studies, 1,148,387 participants, 173,107 deaths) In the group with the highest UPF intake, the risk of death from all causes was 15% higher than in the lowest group (HR = 1.15). Dose-response analysis: every 10% increase in UPF intake matched a 10% increase in the risk of death (HR = 1.10).
• 2024 BMJ Umbrella Review:(45 analyses, 9.8 million participants) This widened the picture further: UPF intake was associated with 32 different health problems. These include death from cardiovascular disease (RR 1.50, "convincing" level of evidence), type 2 diabetes (RR 1.12), anxiety (OR 1.48), depression, obesity and metabolic syndrome.
• 2025 AJPM Study:It analysed data from 8 countries and found a linear dose-response relationship between UPF and death from all causes. On this basis, there is no "safe" UPF threshold, and risk falls as intake falls.

What Exactly Is UPF?

Under the NOVA classification system, ultra-processed foods are industrial formulations. They usually contain more than 5 ingredients, and most of these are additives you would not use at home: emulsifiers, sweeteners, colourings, flavourings, thickeners.

A practical strategy: avoiding UPF completely can be hard in modern life, but cutting the share is possible. Try cooking completely UPF-free one day a week and slowly increase the number of these days. Shop around the "outer aisles" of the supermarket (fresh vegetables, fruit, meat and dairy are usually along the outer aisles). Most of the packaged products in the inner aisles are UPF.

Conclusion: The Big Picture Behind the 10+1 Rules

To sum up the 10+1 rules: start from the base of the Mediterranean diet. Add the principles of ageing biology. Take out ultra-processed foods. Eat a few fewer calories. Feed your microbiome with a variety of plants.

It is no accident that most of these rules overlap. Eating more vegetables (Rule 1) increases plant variety (Rule 6) and cuts UPF (Bonus rule) at the same time. Choosing plant protein (Rule 2) automatically limits red meat (Rule 3). Fermented foods (Rule 8) add to microbiome diversity (Rule 6). The strength of eating for longevity comes from a small number of changes that feed into each other. Beyond nutrition, we explain how we look at longevity on a separate page, with a map of 12 biological processes. You can reach the other guides from the Longevity Insights page.

"Take the strengths of other diets, remove what does harm in the long run, and add the core principles of ageing biology. What you get is an eating pattern that is sustainable, based on science and free of extremes."

Longevicals, Eating for a Longer Life

Where to Start?

You do not need to change everything at once. Adding just 2-3 of these rules to your life today is a good start. Tick off the list below as you go (your choices stay in your browser).

Longevicals, Eating for a Longer Life (2026). This printout gives general information and does not replace personal medical advice. If you have a chronic condition, take medication, or are pregnant or breastfeeding, consult your physician.

"Nutrition is one of the most accessible levers for healthy ageing. No supplement can replace the foundation that good nutrition builds. Nutrition alone is not enough either. Sleep, exercise, stress management and social ties matter at least as much."

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