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The MPS Protein Threshold

Why 0.25-0.40 grams per kilogram per meal is the anabolic trigger.

Muscle protein synthesis saturates per meal — spacing protein beats front-loading it.

Eating 150 g of protein in one meal does not give you 6x the muscle building of 25 g. Muscle protein synthesis (MPS) saturates at about 0.25-0.40 g of protein per kilogram of bodyweight per meal. Above that, excess amino acids oxidise to glucose or ketones. The practical upshot: spread protein across 3-5 meals, not two.

Quick answer

Muscle protein synthesis saturates per meal — spacing protein beats front-loading it.

What you are trying to do
Why 0.25-0.40 grams per kilogram per meal is the anabolic trigger.
Best next step
Anabolic Trigger · MPS Bolus
Limit to remember
Treat this as a practical aid for the task, not a replacement for professional judgment.

Key points

  • ▸ Per-meal saturation: 0.25 g/kg sedentary, 0.40 g/kg trained athletes after hard training (Morton 2018 meta-analysis).
  • ▸ Daily target: 1.6-2.2 g/kg for muscle-building; 0.8-1.2 g/kg for general health.
  • ▸ Leucine is the trigger: 2.5-3.0 g of leucine per bolus saturates mTOR. Whey has ~11% leucine, complete foods less.
  • ▸ Meal spacing: 3-4 hours between protein feedings aligns with MPS downregulation cycle.
  • ▸ Training state matters: a hard training day raises both per-meal and daily targets. Rest days drift lower.

Examples

  • 180 lb lifter · serious training · 4 meals
    Per-meal 32 g · daily 163 g · via 4 meals 128 g — short. Add a 5th meal or bump each bolus to 40 g.
  • 140 lb runner · moderate training · 3 meals
    Per-meal 20 g · daily 115 g · via 3 meals 60 g — way short. Protein is the limiting macro here; both bolus and meal count are low.
  • 220 lb lifter · 5 meals
    Per-meal 35 g · daily 200 g · via 5 meals 175 g — close enough. Fine-tune with a 40 g post-training shake.

When to use which tool

Related

Frequently asked questions

› Does the anabolic window exist?

The 30-minute post-workout panic is overstated. Total daily protein matters most; bolus timing matters second; the specific minute post-training rarely matters for non-competitive lifters.

› Can plant protein hit MPS? Trust & accuracy

Yes, but it requires more total protein per meal because plant sources have lower leucine density and less complete amino acid profiles. Roughly 20-30% more protein per bolus closes the gap.

› How should I use this guide with a Kefiw tool? How-to

Use the guide as the plan and the linked Kefiw tool as the check. Read the steps first, try the move manually, then use the tool to compare outputs, catch edge cases, and decide whether the result actually fits your task.

› What mistake do tool guides help avoid? Troubleshooting

Tool guides help avoid using a utility mechanically without understanding what you are trying to accomplish. Most word, writing, and text utilities are fast, but speed can hide context mistakes. Know whether you are solving a puzzle, cleaning copy, drafting a line, or checking a rule.

› Can a tool guide help me learn the skill? How-to

A tool guide can help you learn if you pause before accepting the output and ask why it worked. Compare your first guess with the tool result, look for the rule or pattern, and repeat that review. Passive copying solves one task; active review builds the skill.