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I find this humorous but I’m also genuinely curious what the analogy is between fiber and GLPs?

Fiber is essentially mass with little to no nutrition in it. So it makes you feel fuller without adding calories, like GLP-1 drugs.

I do think there's a strong argument that lack of fiber and protein are huge contributors to the world's obesity problems.

"So it makes you feel fuller without adding calories, like GLP-1 drugs"

Nobody really knows how GLP-1 agonists work, but given the other effects (e.g. insulin stability, change in other addictive behaviours etc.) it's definitely not just this.

In most developed countries people eat lots of fiber. Like just unbelievable amounts of meat, more than ever before in human history and prehistory.

What are you talking about?? Meat contains no fiber. The primary fiber source is plant-based foods (e.g., vegetables). So modern populations eating lots of meat means they're getting little to no fiber.

Sorry, that was a mistype, I mean lots of meat, very little fiber.

Probably simply "makes you feel full longer".

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