Metabolic & Weight
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New York Let Its Poorest Mothers Breathe Bus and Boiler Soot for Decades. When It Cleaned the Air, Toddler Scores Rose.
Columbia followed more than a thousand poor New York kids for twenty years as soot from buses and heating oil fell, and their age-3 cognitive scores came in 26 percent higher. How much of that the air can actually claim is the open question, and the sharper evidence is buried underneath it.
Metabolic & WeightBerkeley Dusted Off a Shelved 1970s Fat Compound That Burns Energy Instead of Appetite, and in Mice It Spared the Muscle
GLP-1 drugs quiet your appetite, and along with the fat they can pull out a real chunk of muscle. A shelved acetyl-CoA carboxylase inhibitor from the 1970s went after the other lever, energy burned, and in obese mice it left the lean mass alone.
Metabolic & WeightThe Exercise Paradox: Lousy for Losing Weight, Your Best Bet for Keeping It Off
A study of more than 1,100 people found activity did almost nothing for the pounds they shed, yet it was one of the strongest signals of whether that weight stayed gone.
Metabolic & WeightFluoride and Kids' Hearts: The Reassuring Study Tested Water Below What US Taps Are Told to Add
Researchers measured fluoride and heart risk in 161 Iranian children, and the main analysis found no significant link. But they drank water below the level US taps are told to add, and a different adjustment flipped the numbers.
Metabolic & WeightThis Weight-Loss Hormone Protected Mouse Livers Without a Pound Lost. Novo Nordisk Supplied It and Put Two Scientists on the Study.
The hormone works through the same brainstem switch that makes weight-loss drugs nauseating, and the company developing it supplied the compound, funded the mouse study, and put two of its scientists on the author list.
Metabolic & WeightThe Hunger Neurons Ozempic Was Meant to Silence Are the Ones Burning Your Fat
Silence the hunger neurons and semaglutide keeps killing appetite, but in Yale's female mice the lost fat came back within 15 days.
Metabolic & WeightHow 244 People Cut 357 Calories a Day Without Eating Less Food
The people on the low-fat vegan diet didn't count calories or shrink portions. They ate the same weight of food and took in hundreds fewer calories a day. The group that ran the trial also has a stake in what you conclude.
Metabolic & WeightThe 123 Percent Death-Risk Number in the Vitamin D Headlines Was Never Tested as a Pill
An observational study of 5,520 older Britons tied belly fat plus low vitamin D to a 123 percent higher death risk. Hand people the actual pill in a randomized trial and mortality drops about 5 percent, with nothing at all for the heart.
Metabolic & WeightLilly Turned the Receptor On, Amgen Turned It Off, and Both Strip Weight. The Map Came Four Years Late.
Eli Lilly's tirzepatide switches the gut-hormone receptor on. Amgen's MariTide blocks it. Both drive weight loss, and until a publicly funded Cambridge mouse study, no one had cleanly mapped how one receptor works in both directions.
Metabolic & WeightA Study Blames the Rising Atmosphere for Your Blood Chemistry. Your Own Breath Overwhelms It.
Blood bicarbonate climbed about 7 percent since 1999, and two researchers blame the rising atmosphere. But convert that 51 ppm into the pressure that reaches your lungs and it moves your blood by about 0.04 millimeters of mercury, roughly a thousand times too small to matter.
Metabolic & WeightA Brain Protein Made Female Mice Overeat Fat, and the $441,000 Obesity Drug Worked Weakest on Them
Dietary fat switches on an appetite-protecting brain protein in male mice but not females. Delete it and the females overeat fat, gain more weight, and setmelanotide, the $441,000-a-year MC4R obesity drug, loses much of its appetite-suppressing punch on them.
Metabolic & WeightThe Peptide Boom Hides One Divide: Human Trials on a Few, Rodent Data and Case Reports on the Rest
Semaglutide and tirzepatide erased up to 22 percent of body weight in trials with thousands of patients. The research-only peptides sold beside them, like BPC-157, have not completed a single published human efficacy trial. A popular 2026 guide lists them as equals.
Metabolic & WeightThe Juice Industry Paid for the Study Telling You a Daily Glass Lowers Depression Scores
In a 42-person trial, the group that added a daily glass of juice improved on depression scores while the group that added only whole fruits and vegetables didn't, and the European juice trade body paid for the whole thing.
Metabolic & WeightA Brown-Fat Gene Turns Out to Be the Dial Between a Heart Cell Dividing and Growing Up
Turn PRDM16 down and lab-grown heart cells start dividing again but stay weak. Turn it up and they mature but quit the cell cycle. It's the same gene that decides whether a cell becomes calorie-burning brown fat.
Metabolic & WeightThey Gave PTSD Patients THC Drops at Bedtime. More Than a Third Stopped Having Nightmares Entirely.
Dronabinol beat placebo on the nightmare symptom the VA's longtime standby flunked, and the company that sells dronabinol helped fund the trial that found it worked.
Metabolic & WeightThe Prescription Vitamin D Added to Protect Failing Kidneys Made Them Decline Four Times Faster
Chasing a parathyroid-hormone target, doctors added active vitamin D to a kidney drug. The hormone dropped 35 percent, and the kidneys declined four times faster.
Metabolic & WeightThe Fat Rebound Pediatricians Watch For at Age Six: Measure the Waist, and It Turns Out to Be Muscle and Bone
Waist-to-height ratio tracks body fat with about 90 percent accuracy. In 2,410 American kids it kept falling straight through the age when BMI says the fat comes roaring back.
Metabolic & WeightYour Fat Cells Remember Being Fat, and That Memory Outlasts the Weight Loss
Your body defends its heaviest weight for years after you lose it, which is why the rebound isn't weak willpower and why the injection only works while you keep paying for it.
Metabolic & WeightOrforglipron Reaches Deep Into the Brain's Reward Circuit and Turns the Dopamine Down
In mice engineered with human GLP-1 receptors, the new oral pills reached the central amygdala, a deep reward hub, and thinned the dopamine payoff of eating for pleasure. The government's addiction institute is already watching.
Metabolic & WeightThe GLP-1s That Barely Move the Scale Don't Cause Hair Loss, and That's the Clue Everyone Missed
Women on semaglutide shed hair at about twice the rate of men, and the weakest GLP-1s show almost no signal, which points the cause away from the follicle and straight at how fast the weight comes off.
Metabolic & WeightThe Mice Ate More and Got Leaner. The Switch Was One Amino Acid, Turned Down.
USC mice on a low-protein, methionine-tuned diet ate as many calories as the junk-food group and still lost fat, while their own bodies pumped out more GLP-1. The scientist behind it also owns the company selling longevity diets.
Metabolic & WeightA Gut Microbe Was Feeding Ammonia to Sick Livers. A Michigan Peptide Cut Off the Supply in Monkeys.
The compound reversed severe fatty liver in monkeys by starving one ammonia-making gut bacterium. It also comes from a company its lead inventor founded, and no human has taken it for this.
Metabolic & WeightBoth Groups Lost the Same Seven Kilos. Only the Calorie Counters Had to White-Knuckle It.
In an 18-month Adelaide trial, fasting and daily calorie-cutting stripped off the same seven kilos, but for the counters part of that loss ran on constant conscious restraint the fasters' scores never showed.
Metabolic & WeightFor Forty Years He Said the Standard Cholesterol Target Was Wrong. A Computer Finally Agreed.
A Northwestern model projects that the little-used apoB test would prevent more heart attacks and strokes than the LDL number your doctor chases. And non-HDL, a number already printed free on your standard lab report, beat LDL too. No trial has tested any of it on a patient.