2d • General discussion
The One Amino Acid Nobody's Talking About
Everyone's obsessed with "getting enough protein." So am I...
But here's the thing — protein isn't the trigger. Leucine is.
You can hit your protein goal every single day and still not be building or maintaining muscle the way you think you are, because muscle protein synthesis doesn't just respond to total grams. It responds to hitting a leucine threshold — somewhere around 2.5-3g per meal for most adults, more if you're older.
Below that threshold? Your body basically shrugs. The anabolic switch doesn't flip.
CRITICAL - This means you remain in a catabolic state. Breaking down and falling apart. Whether you want muscles or less inflammation, this has to be stopped.
This is why the guy eating six small "protein-ish" meals a day is often losing the game to the guy eating three solid leucine-rich meals. Frequency doesn't matter if you're never crossing the luecine threshold.
Leucine works through mTOR — it's the signal that tells your cells "build something." No mTOR activation, no synthesis, doesn't matter how much protein powder you dumped in that shake.
And this isn't just a gym-bro topic. This is a moms topic, an aging topic, a recovering-from-illness topic, a metabolic health topic. Anyone whose body needs to build or preserve tissue needs to be thinking about leucine specifically, not protein generally.
Best sources: whey isolate, eggs, chicken, beef, fish.
***Plant sources exist but you need almost double the volume to hit the same threshold — something vegetarian/vegan patients need to know and almost never do.
You can also use Perfect Aminos when you miss your whole food protein requirements. (the link is in the free resources section for Fullscript to get a discount.)
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The One Amino Acid Nobody's Talking About
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