From Calories In, Calories Out” to Incretin Revolution

Understanding GLP-1 and GIP

“Doc, what’s the best way to lose weight? I’ve tried every diet under the sun, yet I lose weight only to gain it all back. I’m ready to throw in the towel on the whole thing. Even worse, now my cholesterol is going up and I’ve entered prediabetes.”

Until about three years ago, most doctors would sit up in their chair and confidently declare: “Calories in, calories out. The only way to lose weight is to burn more than you consume.”

And we know how that went...

Now, that same doctor sits up in their chair and states something remarkably different: “If you take this medication—a GLP-1 receptor agonist or GIP/GLP-1 receptor agonist—I would expect you to lose 15-20% of your body weight over the next year to 18 months.”

Sure, there were some other weight loss medications available—like Contrave (Bupropion/Naltrexone) and Orlistat (a fat blocker). But in reality, those medications typically delivered only about 5% weight loss at best, often with significant side effects.

What changed? How did we go from the oversimplified “eat less, move more” mantra to medications that are fundamentally altering our approach to obesity and metabolic disease?