{"id":4245,"date":"2026-10-12T08:32:23","date_gmt":"2026-10-12T08:32:23","guid":{"rendered":"https:\/\/nhdbio.com\/?p=4245"},"modified":"2026-10-12T08:32:23","modified_gmt":"2026-10-12T08:32:23","slug":"explique-semaglutide-augmentation-progressive-graisse-hepatique-irm","status":"publish","type":"post","link":"https:\/\/nhdbio.com\/fr\/semaglutide-step-up-liver-fat-mri-explained\/","title":{"rendered":"S\u00e9maglutide et graisse h\u00e9patique : comprendre la baisse de 8.8% \u00e0 3.1%"},"content":{"rendered":"
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Editorial illustration, not an experimental photograph.<\/figcaption><\/figure>\n

After weight loss, does the fat in the liver also decrease? An analysis announced on October 1 used MRI scans to answer this question. The results are worth attention, but first we need to be clear: who was scanned, and what the numbers actually represent.<\/p>\n

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Fat in the liver is different from fat around the waist<\/h2>\n

Fat is not only stored under the skin; it can also build up in the liver. Whether someone looks heavy or not does not directly tell us how much liver fat they have; and how much weight they lose cannot directly replace a liver examination.<\/p>\n

This study used MRI to estimate the proportion of liver fat. What it provides is information about liver fat content, not the results of taking liver tissue samples and looking at inflammation or scarring.<\/p>\n<\/section>\n

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55 people had MRI scans, and 26 people initially had more than 5%<\/h2>\n

This post-hoc analysis came from some participants in the STEP UP trial, a total of 55 adults with obesity but without diabetes. The study combined data from two doses of semaglutide and followed participants through week 72.[1]<\/a><\/p>\n

Among them, 26 people started with liver fat above 5%. By week 72, 23 people had values that dropped below 5%. Therefore, the news phrase "nearly ninety percent returned to the normal range" refers to 23 divided by 26, not ninety percent out of 55 people, and not that every patient with fatty liver disease would respond this way.<\/p>\n<\/section>\n

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From 8.8% to 3.1%, how much was actually reduced?<\/h2>\n

In the combined treatment group, the average liver fat proportion fell from 8.8% to 3.1%. Subtracting the two numbers gives 5.7 percentage points; then dividing 5.7 by 8.8 gives a relative reduction of about 64.8%.[1]<\/a><\/p>\n

Both calculations can describe the same change, but they mean different things. It is like a temperature dropping from 30 degrees to 20 degrees: first you say it fell by 10 degrees; when talking about proportion, you then explain how large that 10 is relative to the starting point. Here, too, "reduced by about 65%" cannot be understood as losing 65% of total body fat.<\/p>\n