SELECT trial explained: does semaglutide reduce cardiovascular risk because of weight loss, or is something else going on? In this video, I break down the SELECT trial and the follow-up analysis examining whether the cardiovascular benefit of semaglutide was directly mediated by weight loss. The answer matters, because the data suggest the reduction in major adverse cardiovascular events was not simply a function of people losing more weight.

I’m a board-certified vascular surgeon focused on cardiometabolic prevention, and in this video I walk through what the SELECT trial actually showed, what the subsequent analysis adds, and why this changes how we think about GLP-1 receptor agonists, obesity, heart disease, and prevention. If you’ve been wondering whether semaglutide’s heart protection is just about the number on the scale, this is where we separate mechanism from marketing.

In this video, I cover:
• The SELECT trial design and main cardiovascular outcomes
• How semaglutide affected heart attack, stroke, and cardiovascular death risk
• The follow-up mediation analysis on weight loss
• Why the cardiovascular benefit does not appear to be explained by weight loss alone
• What this may mean for inflammation, metabolism, and vascular protection
• How I think about semaglutide clinically in the bigger picture of cardiometabolic health

If you care about semaglutide, GLP-1 drugs, cardiovascular disease prevention, obesity medicine, insulin resistance, plaque, and the real mechanisms behind cardiometabolic risk reduction, you’re in the right place.

Question for you: when you think about semaglutide, do you mainly think “weight loss drug,” or has the cardiovascular data changed your view?


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🧬 About Dr. Lily Johnston

Dr. Johnston is a double board-certified vascular and general surgeon in San Diego, specializing in metabolic and cardiovascular prevention. She’s the founder of CorSight Health and a passionate advocate for reimagining how medicine approaches chronic disease.

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