Hayat Longevity
The Hayat Journal

Longevity, in plain sight

Evidence-based writing on longevity medicine, healthy ageing, metabolic health, nutrition and preventive care, from the clinical team at Hayat Longevity. No hype. No fads. Only what the science supports.

Latest articles

New evidence-based pieces published regularly. Follow a series or subscribe below to read them first.

Hayat Dietitian's Grocery Picks · Episode 10: The Cheese Counter
Grocery Picks9 min

Hayat Dietitian's Grocery Picks · Episode 10: The Cheese Counter

Real cheese against processed slices, the sodium column most guides omit, the phosphate concern that is genuine and the liver claim that is not, and why aged hard cheese suits Malaysian guts.

R.D. Saffiyah Azhar
Your Birth Certificate Lies: Decoding Biological Age and Taking Control of Your Healthspan
Longevity Medicine12 min

Your Birth Certificate Lies: Decoding Biological Age and Taking Control of Your Healthspan

Two people can share a birthday and be in completely different biological states. Biological age estimates the functional condition of your cells rather than the years since birth. Here is how it is measured, which tests are worth trusting, and what genuinely moves the number.

Dr. Daniel Chong
The Science of Pressurised Repair: HBOT, the Hyperoxic-Hypoxic Paradox, and Why the Chamber Matters
Longevity Science12 min

The Science of Pressurised Repair: HBOT, the Hyperoxic-Hypoxic Paradox, and Why the Chamber Matters

Under enough pressure, oxygen dissolves directly into plasma and drives tissue repair. HBOT is proven for defined conditions and promising but unproven for ageing. The regenerative signal comes from the change in oxygen, not the oxygen itself, and it needs a real clinical chamber to work.

Mr. D. Ng
Forest Bathing in Penang: The Science of Shinrin-Yoku, and Where to Practise It
Longevity Science10 min

Forest Bathing in Penang: The Science of Shinrin-Yoku, and Where to Practise It

Shinrin-yoku, or forest bathing, is taking in the forest through all five senses, slowly. The evidence points to lower cortisol, a shift toward parasympathetic recovery, and better wellbeing at around 120 minutes a week. Penang has a 130 million year old rainforest fifteen minutes from a hospital car park.

Mr. D. Ng
The Ultimate Longevity Drug: Why Cellular Health Cannot Be Bought in a Bottle
Longevity Science9 min

The Ultimate Longevity Drug: Why Cellular Health Cannot Be Bought in a Bottle

The most consistently protective intervention in all of longevity medicine is not a supplement or an injection. It is movement. Cardiorespiratory fitness predicts survival as powerfully as major disease, and the steepest benefit belongs to people currently doing the least.

Dr. Daniel Chong
Hayat Dietitian's Grocery Picks · Episode 9: The Breakfast Spread Shelf
Grocery Picks8 min

Hayat Dietitian's Grocery Picks · Episode 9: The Breakfast Spread Shelf

Why the eggs in a kopitiam set are the part doing the work, why the MCT claim made for kaya does not hold, and how the spread on your toast decides your mid-morning.

R.D. Saffiyah Azhar
Hayat Dietitian's Grocery Picks · Episode 8: The Egg Shelf
Grocery Picks8 min

Hayat Dietitian's Grocery Picks · Episode 8: The Egg Shelf

What happened to the dietary cholesterol advice, which carton labels mean something and which do not, the one enrichment worth paying for, and where telur separuh masak sits on food safety.

R.D. Saffiyah Azhar
Hayat Dietitian's Grocery Picks · Episode 7: The Peanut Butter Shelf
Grocery Picks9 min

Hayat Dietitian's Grocery Picks · Episode 7: The Peanut Butter Shelf

The oil on top is the sign you bought the right jar. Malaysian peanut butters compared on protein and sugar, a correction on hydrogenated oil, and the aflatoxin question our climate raises.

R.D. Saffiyah Azhar
Hayat Dietitian's Grocery Picks · Episode 6: The Plant Milk Wall
Grocery Picks8 min

Hayat Dietitian's Grocery Picks · Episode 6: The Plant Milk Wall

Soy substitutes for dairy on protein, oat is largely carbohydrate and almond is close to flavoured water. Fortification, hidden sugars, and the soy and hormones question answered properly.

R.D. Yee Lin
Hayat Dietitian's Grocery Picks · Episode 5: The Oat Shelf
Grocery Picks8 min

Hayat Dietitian's Grocery Picks · Episode 5: The Oat Shelf

Beta-glucan is the reason oats work, and 3g a day is the number behind the approved cholesterol claim. Rolled, steel-cut, instant and the 3-in-1 sachet problem, with the figures.

R.D. Saffiyah Azhar
Hayat Dietitian's Grocery Picks · Episode 4: The Milk Aisle
Grocery Picks9 min

Hayat Dietitian's Grocery Picks · Episode 4: The Milk Aisle

Low fat or full cream matters less than you have been told. Lactase non-persistence matters far more, and almost no local milk guide mentions it. The Malaysian shelf compared, and who should choose what.

R.D. Yee Lin
Hayat Dietitian's Grocery Picks · Episode 3: The Yoghurt Aisle
Grocery Picks8 min

Hayat Dietitian's Grocery Picks · Episode 3: The Yoghurt Aisle

Greek and Greek style are different products at similar prices. The protein numbers across Malaysian tubs, the added sugar benchmark hiding in the carbohydrate column, and why yoghurt is the dairy that suits Malaysian guts.

R.D. Yee Lin
Hayat Dietitian's Grocery Picks · Episode 2: The Cooking Oil Aisle
Grocery Picks8 min

Hayat Dietitian's Grocery Picks · Episode 2: The Cooking Oil Aisle

Extra virgin olive oil is far more heat stable than its reputation suggests, and the smoke point figure most articles quote is wrong. Palm olein, seed oils and reused frying oil, assessed fairly.

R.D. Saffiyah Azhar
Hayat Dietitian's Grocery Picks · Episode 1: The Bread Shelf
Grocery Picks8 min

Hayat Dietitian's Grocery Picks · Episode 1: The Bread Shelf

Brown does not mean wholemeal. How to read a Malaysian bread label in ten seconds, which loaves genuinely clear the fibre and sodium bar, and where caramel colouring hides.

R.D. Saffiyah Azhar
Stress and Cortisol Control for Executives
Stress & Cognition9 min

Stress and Cortisol Control for Executives

Cortisol is not the enemy; a broken cortisol rhythm is. Chronic, low-control stress flattens the normal daily curve, drives visceral fat accumulation, impairs glucose handling and degrades sleep. The interventions that work are physiological and structural, not motivational.

Dr. Daniel Chong
Advanced Sleep Engineering: Beyond Eight Hours
Sleep & Recovery18 min

Advanced Sleep Engineering: Beyond Eight Hours

Sleep engineering means treating sleep as a set of controllable inputs rather than a nightly accident. The 10-3-2-1-0 countdown, the light levels that predict metabolic risk, what actually reduces bedroom noise, and why houseplants do not clean your air.

Dr. Daniel Chong
How to Lower Your Biological Age, Naturally
Longevity Science9 min

How to Lower Your Biological Age, Naturally

Biological age estimates how well your body is functioning relative to your years. The evidence that it can be lowered naturally is real but early: the strongest levers are stopping smoking, improving cardiorespiratory fitness, reducing visceral fat, regularising sleep, and eating a predominantly whole-food diet.

Dr. Daniel Chong
What a Standard Medical Check-Up Misses
Health Screening9 min

What a Standard Medical Check-Up Misses

A standard medical check-up is designed to detect disease that has already arrived, not risk that is still developing. It typically misses early insulin resistance, lipoprotein particle count, Lp(a), inflammation, visceral fat and cardiorespiratory fitness, all of which shift years before a routine panel turns abnormal.

Dr. Daniel Chong
Healthspan vs Lifespan: How to Add Life to Your Years
Longevity Science8 min

Healthspan vs Lifespan: How to Add Life to Your Years

Lifespan is how long you live. Healthspan is how long you live in good health, free of chronic disease and disability. Most people die roughly a decade after their healthspan ends. Closing that gap depends less on medicine and more on cardiorespiratory fitness, muscle, metabolic health and sleep.

Dr. Daniel Chong
Visceral Fat: The Hidden Organ That Ages You From the Inside
Metabolic Health12 min

Visceral Fat: The Hidden Organ That Ages You From the Inside

Visceral fat behaves less like storage and more like an active endocrine organ, quietly driving inflammation, insulin resistance and cardiovascular risk. Here is what the science shows, and the levers that genuinely move it.

Dr. Daniel Chong
Protein, Muscle and the 40-Year Turning Point
Nutrition12 min

Protein, Muscle and the 40-Year Turning Point

Adults lose 0.5 to 1 per cent of muscle mass a year from their 40s. How much protein you actually need, why distributing it across meals matters as much as the total, and where Malaysian diets typically fall short.

R.D. Saffiyah Azhar

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