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Protein Bolus Edge Cases

Older lifters, intermittent fasters, vegans, and very heavy athletes.

The standard 0.25-0.40 g/kg rule covers most people — but not these five populations.

The MPS saturation formula is a population average. Five sub-populations consistently fall outside it: older adults with anabolic resistance, plant-only eaters, IF dieters, very lean athletes cutting, and heavyweight athletes at the high end of the bodyweight scale. Each needs an adjustment.

Quick answer

The standard 0.25-0.40 g/kg rule covers most people — but not these five populations.

What you are trying to do
Older lifters, intermittent fasters, vegans, and very heavy athletes.
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

  • ▸ Older adults (50+): anabolic resistance raises the per-meal threshold to 0.40-0.50 g/kg. More protein per bolus, not more meals.
  • ▸ Plant-only diets: 20-30% more protein per meal to compensate for lower leucine density and digestibility.
  • ▸ Intermittent fasting: 2-meal days can work if each bolus is 0.50-0.60 g/kg — doubled up to fit daily total. Below that, daily target missed.
  • ▸ Cutting athletes (aggressive deficit): raise daily target to 2.2-2.5 g/kg to preserve muscle. Normal 1.8 g/kg under-delivers in deficit.
  • ▸ Very large athletes (250+ lb): the per-kg formula can produce intimidating absolute numbers (200+ g/day) that are hard to eat cleanly. Use lower-bound 1.6 g/kg and fill carbs.

Examples

  • 65 years old · 180 lb · lean-mass preservation
    Per-meal target 38 g (not 32) due to anabolic resistance. 4 meals × 38 g = 152 g/day. Leucine-rich sources preferred.
  • IF 16/8 · 2 meals
    Daily 160 g split as 80/80. Each bolus well above saturation but fits the compressed window. Works; not optimal.
  • Aggressive cut · 180 lb
    Target 200 g (2.5 g/kg) during a 1000-cal deficit. Upper-end protein preserves muscle in deficit — standard 140 g bleeds lean mass.

When to use which tool

Related

Frequently asked questions

› Is there a ceiling where more protein is wasted? Trust & accuracy

Yes — above ~2.5-3.0 g/kg/day, additional protein contributes nothing to MPS in healthy trained adults. Not harmful for renal-healthy individuals, just oxidised to glucose or ketones.

› What about pregnancy and lactation?

Targets rise ~10-20 g/day over baseline. Consult a clinician — this page does not substitute for medical guidance.

› 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.