Siim Land Profile picture
Apr 18, 2024 7 tweets 3 min read Read on X
The man who defies aging

Chuando Tan is a 58-year-old man from Singapore who looks like he's in his 20s or 30s

Here's a breakdown of his diet, exercise, and other routines⬇️⬇️
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Chuando was born in 1966

He's been a model for decades and also does photography

He recently became popular on social media due to his youthful appearance despite being 58 Image
First, he obviously looks older than he did in his 20s but you could still easily confuse him for someone in his 20s or 30s

Second, clearly good genetics

Third, while we can't exclude the possibility of some treatments, he looks normal imo but I'm not an expert on that
Chuando has been following a very healthy and fit lifestyle all his life

He exercises 3-5 times a week for about 90 minutes each. Mostly weights, swimming, speed walking.

Gear? Probably although he weighs only 175 pounds
It would mess up his baby face tho Image
What's his diet?

A higher protein traditional fitness diet

His breakfast is 4 whole eggs and 2 egg whites, avocado

Other foods: chicken, fish, rice, vegetables, water

No smoking, alcohol, coffee, or tea

Sometimes he indulges on ice cream Image
He says he doesn't have skincare nor does he take supplements

It's funny how he looks younger than everyone else putting in significantly more effort

He certainly has the genetic card playing for him, but he also has a pretty fit lifestyle Image
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More from @siimland

Sep 14
Green tea is one of the healthiest beverages in the world
- improves cardiovascular disease risk factors
- improves heart health
- improves metabolic health markers
- targets all hallmarks of aging
- reduces visceral fat
- is associated with lower mortality

Full thread on green tea benefits⬇️⬇️

Graph from: DOI:10.20944/preprints202309.0582.v1Image
Green tea contains many bioactive compounds that target all the hallmarks of aging:

- genomic instability
- telomere attrition
- epigenetic alterations
- loss of proteostasis
- impaired autophagy
- deregulated nutrient sensing
- mitochondrial dysfunction
- cellular senescence
- stem cell exhaustion
- altered intracellular communication
- chronic inflammation
- gut dysbiosis

Most of these effects are mediated by EGCG and other polyphenolic compounds in green tea

Graph: DOI: 10.14336/AD.2025.0398Image
A 2023 meta-analysis of 55 randomized controlled trials saw that green tea supplementation:
- lowers total cholesterol
- lowers LDL cholesterol
- raises HDL cholesterol
- lowers fasting blood sugar
- lowers HbA1c, a marker of long-term glucose levels
- lowers blood pressure

All results were statistically significant

PMID: 36704803
Read 8 tweets
Sep 9
Microneedling is crazily effective for skin aging

The small needles cause microtrauma, triggering collagen synthesis and skin repair - up to 400% increase in collagen synthesis

Full video: youtu.be/n7xjmLa7TR4

Paper: mdpi.com/1660-4601/19/1… Image
In this study, microneedling + topical vitamin A and C resulted in 658% higher epidermal thickness compared to no treatment

Study: pubmed.ncbi.nlm.nih.gov/24513133/Image
Microneedling for 60 days also improves pigmentation disorders. The microneedling lightens skin stains in patients with melasma.

pmc.ncbi.nlm.nih.gov/articles/PMC46…Image
Read 6 tweets
Aug 12
Ice baths are a very popular trend on social media

So are saunas but to a slightly lesser degree

But which one has more health benefits?⬇️⬇️ Image
Sauna has many protective health benefits and appears to even offset the higher risk of all-cause mortality related to lower socioeconomic status, high blood pressure, and high inflammation levels

PMID: 37270272 Image
Using the sauna >4x a week compared to 2-3x is associated with:
- 63% reduced heart disease mortality
- 50% lower fatal cardiovascular disease
- 46% lower risk of hypertension
- 40% reduced all-cause mortality

PMID: 25705824; PMID: 25705824 Image
Read 8 tweets
Aug 10
I analyzed Bryan Johnson’s biomarkers… and he doesn’t have the best in the world.

I analyzed 65 of the markers he’s published:
-44 of them I have better results
-9 of them, Bryan has better results
-12 of them are equal

In this thread, I’m sharing the markers and comparing them⬇️⬇️

P.S.

1. I’m not claiming I'm the healthiest person alive or to have the world’s best biomarkers—but I do have factually better biomarkers than Bryan.

There are dozens of people who have better biomarkers than Bryan and me out there.

2. This isn’t about “dunking” on Bryan. Bryan always asks for people to challenge his results and prove if someone has better markers, so here I am.

3. I disagree that you can base someone's health solely on biomarkers because biomarkers can be gamed with pharmaceuticals, etc. But I'm just playing Bryan's own game here.

4. Age is a moot point. Bryan says he has the best biomarkers of anyone in the world. If chronological age mattered, the “healthiest person” would always be an 18–20-year-old.

I’m 30, and my biomarkers are better than his, so his claim doesn’t hold. He could argue he’s the healthiest 47-year-old, but not the healthiest overall.

Now that this is out of the way, let's go through all the biomarkers.Image
Image
Quick summary of the differences in our biomarkers:
-Bryan has good metabolic health, but I have slightly better
-Bryan has poor kidney function – mine is excellent
-We have semi-equal liver values and lipids
-Bryan’s fitness (strength/VO2) is good for his age, but not elite by any means. Mine is significantly better
-We both have normal hormone levels, nothing extraordinary
-Bryan’s PhenoAge (biological age) based on his biomarkers is 8.81 years lower than his chronological age, mine is 18.5 years lower
Fitness markers

VO2 max
- Bryan 54.2 (good but not elite)
- Siim 66 ✅

Grip strength
- Bryan 132 lbs (I don’t know if it’s combined arms or one arm)
- Siim 150 lbs ✅(combined arms 298 lbs)

Bench press
- Bryan 240 lbs
- Siim 300 lbs ✅

Leg press (the quarter-depth leg press test)
- Bryan 850 lbs (barbell parallel squat probably around 115 kg based on leg press result)
- Siim 1,000 lbs ✅(barbell parallel squat 160 kg)

Lung strength
- Bryan 772 L/m
- Siim 785 L/m ✅Image
Image
Read 14 tweets
Aug 3
Regular exercise reduces the likelihood of plaque accumulation in the arteries

However, many long-term exercisers appear to have coronary artery calcification, indicating atherosclerosis progression

The fascinating thing is that despite the higher plaque, those people still have lower rates of cardiovascular disease events and mortality

Full video youtu.be/S-NKPZSkbXg

Graph: academic.oup.com/eurheartj/adva…Image
Middle-aged and older athletes, especially those who exercise for over 2000 MET-min/week, have significantly higher coronary artery calcification scores than controls (PMID: 28465287; PMID: 28450347) Image
Image
People with a higher VO2 max and better cardiorespiratory fitness still have lower rates of cardiovascular disease events across all levels of calcification (PMID: 29343464)

Those with a VO2 max over >50 see attenuation in risk compared to those with a VO2 max of <45 Image
Read 7 tweets
Jul 7
You hear that you need to sleep 7-8 hours, but the majority of studies indicate that 7 hours per night is associated with the lowest mortality risk

In fact, 8 hours per night is often associated with a higher risk than 6 hours per night

Full video about how much sleep you need:

PMID: 26900147Image
Last week, I posted that the Japanese, on average, sleep 5.9 hours a night, but they're the 2nd longest living people in the world (85.27 years)

This is probably due to their very healthy lifestyle and low obesity rates Image
But the Japanese are more frequent nappers than people in Spain and other siesta countries

Up to 21.2% of Japanese men and 17.1% of Japanese women take a nap over 4 times a week (PMID: 27318229)

Whereas in Spain, only 18% of people take naps over 4 times a week Image
Read 6 tweets

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