Every few years in Korea, young adults walk into a clinic for a routine health screening. They are weighed, measured around the waist, asked about their habits, and sent home. For most of them the visit is forgettable. But because Korea keeps a single national health record for nearly everyone, those forgettable visits accumulate into something rare: a window onto the lives of millions of people, followed quietly across more than a decade.
A study published this week in the Annals of Internal Medicine looked through that window. Researchers followed 6.3 million Koreans who were between 20 and 39 years old when they were first screened, none of whom had ever been diagnosed with cancer. Over an average of eleven years, about 152,000 of them developed one.
The question was simple. Did the people who carried more weight in their twenties and thirties go on to develop cancer more often than those who did not?
They did, and the pattern was steady. Among those of normal weight, roughly 1.84 in every 100 received a cancer diagnosis within ten years. Among those with what Korean guidelines call class I obesity, the figure rose to 2.24. Among those with class II obesity, it reached 2.62. These are Asian thresholds, worth noting, and they sit lower than the ones used in Europe and the Americas; class I obesity here begins at a body mass index of 25, a number many Western charts would still label as merely overweight.
It is worth pausing on the size of those differences. The gap between normal weight and class II obesity, over ten years, was less than one additional case per hundred people. For any one person the shift in risk is modest. Spread across a nation of young adults, it becomes a great many diagnoses that might not otherwise have happened, and the authors found that the elevated risk did not fade as these people moved into their forties and fifties. What began in youth followed them into midlife.
The more interesting finding, to my eye, had to do with the waist rather than the scale. When the researchers combined body mass index with waist circumference, a person with class I obesity who also carried abdominal fat had a higher ten-year cancer incidence than a person with class II obesity who did not. The heavier person with a leaner midsection fared better than the lighter person whose weight had settled around the organs. This echoes what we have long understood about visceral fat and its chemistry, the slow hum of inflammation and insulin signaling that seems to travel with it, and it suggests that a tape measure may sometimes tell a truer story than a scale.
The cancers most strongly tied to weight were thyroid, endometrial, and ovarian. Men showed a sharper relative increase in risk, while women showed a larger absolute one, largely because the cancers most sensitive to excess weight in this age group live in the female reproductive system. Notably, obesity was not associated with breast cancer diagnosed before fifty, a finding consistent with earlier research showing that the relationship between weight and breast cancer changes direction after menopause.
A few honest caveats belong here. This was an observational study, which means it can show that two things travel together but cannot prove that one caused the other. The people in it were those who chose to attend screening, which may make them somewhat different from the population at large. Smoking was not measured as finely as one would wish, and it shadows several of these cancers. Thyroid cancer in particular deserves a gentle asterisk, since Korea detects it at unusually high rates through ultrasound screening, and some of what is found may never have caused harm. And this is a Korean cohort, with Korean body composition and Korean definitions of obesity; the direction of the findings almost certainly travels, but the exact numbers may not.
What remains, after the caveats, is a picture that is coherent with decades of prior work and sharpened by the youth of the people in it. The years between twenty and forty are often treated as a grace period, a stretch of life in which the body forgives most things. This study suggests the forgiveness is not complete. The weight a person carries in those years, and especially where they carry it, appears to leave a mark that persists long after.
None of this calls for alarm. It calls for attention, paid early and paid to the right things: the circumference of the waist as much as the number on the scale, and the metabolic quiet that comes when both are kept in reasonable bounds.
LAVV
The link between obesity and early-onset cancer.
A nationwide study of 6.3 million people, age 20-39, with no prior cancer, by BMI and waist circumference, with 11 year follow-up, in South Korea
acpjournals.org/doi/full/10.… @AnnalsofIM
Luis A. Vegas Vicentini retweeted
Two meals with the same nutrition label produced the same blood sugar, but the ultra-processed one pushed insulin higher for most of the next two hours.
Ultra-processed foods supply most of the calories Americans eat, and an umbrella review covering almost 10 million people found convincing evidence that eating more of them tracks with a higher risk of type 2 diabetes. The strongest experiment so far came in 2019, when 20 adults living on a research ward could eat as much as they wanted of ultra-processed or unprocessed diets matched for calories, sugar, fat, fiber and sodium on offer. They ate about 508 more calories a day on the ultra-processed diet and gained 0.9 kg in two weeks.
That trial could not separate the extra eating from the food itself. In the new study, 32 healthy-weight adults aged 18 to 45 ate two 300-calorie meals on separate mornings in random order: whole foods such as egg, banana and cheese, or ultra-processed foods such as a peanut butter and jelly sandwich, a cookie and veggie chips. The meals were matched within 1.6% on calories, carbohydrate, fat, protein, fiber, sodium, water and glycemic index, and each was eaten in full in a sealed room that measured energy use, with blood drawn seven times over three hours.
1. Total blood sugar over three hours was the same after both meals, although it rose faster after the whole-food meal and peaked at 40 minutes either way.
2. Insulin was higher after the ultra-processed meal at 40, 60, 90 and 120 minutes, and its total over three hours was clearly larger.
3. After the ultra-processed meal, the body used more energy and more fat but less carbohydrate, and in brain scans this shift tracked with how reward areas responded to food pictures, even though liking, hunger and fullness did not differ.
Taken together, processing changed how the body handled a meal with an identical label, but the trial does not show that the difference matters. Body weight follows total energy, and across 32 controlled feeding studies, diets that lowered insulin by cutting carbohydrate did not produce more fat loss at equal calories. Here the ultra-processed meal even raised energy use slightly. The proven cost of ultra-processed food is that people eat about 500 more calories a day when it fills the plate, so the practical lever is how much of it you eat.
This was one 300-calorie meal eaten once by young, lean, healthy adults, so it cannot show long-term effects. Protein came from different foods in each meal, the ultra-processed meal had more additives, and food structure was not measured, so the trial cannot say which part of processing mattered. The researchers knew which meal was served.
References
Hutelin Z et al., Nature Metabolism, 2026
Lane MM et al., BMJ, 2024
Hall KD et al., Cell Metabolism, 2019
Hall KD and Guo J, Gastroenterology, 2017
Luis A. Vegas Vicentini retweeted
The return of Machado, after months of resistance from the Trump administration as well as the regime, is also significant. Her reception by millions of cheering Venezuelans proves that the US president does not get to dictate what happens in the rest of the world.
We Venezuelans are forever grateful for the U.S. military intervention that permanently removed Maduro and Cilia.
Yet, a rapid transition away from the current interim Chavista administration is critical.
Only a legitimate democratic government can unlock the corporate and individual investment needed for Venezuela’s true and profound recovery.
Hugo Chávez never drew crowds like this organically.
@MariaCorinaYA’s leadership is indisputable, truly the most consequential force in 21st-century Latin America.
Luis A. Vegas Vicentini retweeted
ABC: María Corina Machado ya está en Venezuela y reaparecerá en minutos en el santuario de la Divina Pastora, en Barquisimeto. Su regreso ha sido posible gracias a una operación diplomática en la que han participado varios países y que ha contado con el conocimiento de Estados Unidos. Hace dos semanas pregunté a Trump por su regreso y me respondió que todo iba a salir bien. El plan ya estaba en marcha. Sin el visto bueno de Washington, esta operación no habría sido posible.
Luis A. Vegas Vicentini retweeted
🚨 BREAKING: Elon Musk says Ukraine violated Starlink’s terms of service by using it for offensive drone strikes. He claims this “loophole” was closed last week.
But there’s a serious problem with his explanation.
In February, Ukraine introduced a whitelist system. Any satellite terminal operating while moving had to be specially authorized through the military Starshield system.
That means civilian Starlink terminals were not supposed to be capable of supporting moving drone missions. Such operations required Starshield.
So what exactly did Musk restrict last week - and most important why?
Dehydration blunts the early response to post-workout protein intake.
In a crossover study, everyone drank the same 45 g of whey after running.
When they finished dehydrated (lost ~2.2% of body weight), their blood amino-acid levels were lower 60 minutes later.
By 120 minutes, the differences were no longer statistically significant. However, the overall 2-hour response stayed lower for total amino acids and BCAAs.
Drinking enough during the exercise to replace half of the fluid lost worked just as well as replacing all of it.
Protein synthesis or muscle growth wasn't measured, but slower amino acid delivery could delay muscle protein synthesis response.
The overall effect on muscle growth is probably negligible, but it highlights how hydration can affect more than exercise performance.
Study: mdpi.com/2072-6643/18/19/326…
100%
Most of your hydration should come from food:
- Watermelon is 95+% water - high in sugar by percentage but almost exclusively water
- Meat is a high percentage of fluid too, less the longer you cook it
- A biscuit is about 10% water - processed food is dehydrated and heavily salted
- That combination leaves you under hydrated and over salted
- Switch to mostly whole real food and your hydration skyrockets
- Add salt back on that switch: salt your food to taste or use electrolytes
@DrAndyGalpin on @hubermanlab
Definitely incorporating this counter defensive strategy into my training, keep up the good work @malikbidzhev
Ten days in a bed can take from an older body what a season of careful work put there. That is not a reason for alarm; it is a reason for devotion. Muscle is the tissue that clears most of the glucose insulin asks the blood to release, so every rep under load, every walk with weight on the back, every hard round that leaves you breathing is also a quiet act of metabolic insurance. We build it slowly and deliberately, because nothing about it comes fast, and we protect the building with the two things the body cannot bargain around: enough protein at every meal, and enough sleep that the night actually finishes its repair. A short illness, a bad week, a hospital stay will come eventually. The question is not whether we lose something then, but how much we had in reserve, and how quickly we return to the work.
Muscle is lost far faster than it's built, and age makes the gap worse. When healthy older adults spent just 10 days in bed, they lost about a kilogram of lean tissue from their legs, which is more than younger adults lose in a month of bed rest. Muscle is where most of the glucose that insulin clears from the blood ends up, and that's why a short illness or hospital stay can leave an older person both weaker and more insulin resistant.
Luis A. Vegas Vicentini retweeted
Today’s Venezuela is what you get when you combine one corrupt kleptocracy (the remnants of the Maduro government) with another (the Trump administration). trib.al/MQwlqHs



















