About the coffee number I gave you in January
Coffee had a good week in the press. A new liver study landed with a 47% attached, and it spread fast.
What?
Researchers at Cedars-Sinai followed 354,957 adults in the UK Biobank for a median of 13 years, published July 1 in Clinical Gastroenterology and Hepatology. Against people who drank none, those drinking 5 or more cups a day had 32% less cirrhosis, 47% less liver cancer and 42% fewer liver-related deaths. They backed it with MRI scans on 28,961 of them: less liver fat, less iron, less scarring. Caffeinated and decaf tracked the same. The study is observational, and its authors said they would not tell anyone to start drinking coffee for their liver.
So what?
Hold that headline loosely, and I’ll go first. In January I wrote a full coffee playbook and told you liver risk drops 40 to 50 percent in habitual drinkers. That came from a real umbrella review. I’d write it with more caution now, because of a paper I missed: in 2024, a reanalysis in the journal Nutrients ran 455,870 people from the same biobank with tighter statistical control, and the liver-mortality benefit vanished. The authors concluded that earlier studies might have overestimated coffee’s effect on the liver.
So the direction is probably real, and the scans make it more believable than the usual coffee headline. The size is probably flattered. People who drink 5 cups a day and volunteer for a biobank are not average people.
Two things in the new paper do hold up, and both are usable today. Decaf carried the same signal, so moving your afternoon cup to decaf costs you nothing on the liver side. And people who sweetened their coffee kept the risk reductions but had 1.36 times the odds of a raised scan marker for liver inflammation and scarring. One marker, one cohort, not proof. It’s also the only coffee variable in the study that moved the wrong way, and the only one you can change before lunch.
Now what?
Hold your count. If you drink 2 to 4 cups, stay there. The study authors don’t recommend climbing to 5.
Take it black. If you sweeten, take it out of the first cup this week and the rest next week.
Push the afternoon cup to decaf. Count back 9 to 10 hours from your bedtime for the caffeine cutoff. Bed at 11pm means last call at 1 or 2pm.
Keep the paper filter. Drip and pour-over strip out the oils that raise LDL cholesterol. French press, moka pot and espresso leave them in.
Science moves. Correcting a line in public beats defending it. Take the sugar out of the cup.
Stay healthy.
Andre