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Linoleic acid (LA) in human adipose tissue has a half-life of roughly 680 days…

2026-08-07 · 17:18 UTC ·@pa_coyote94151 ·1 min read

Brief

Linoleic acid in human adipose tissue has a ~680-day half-life, so dietary LA persists and accumulates over years; US adult adipose LA rose 136% in the last 50 years by direct tissue measurements. Because stored LA is released during weight loss, decades-old intake can recirculate — undermining 'one meal won't hurt' thinking and producing effects the author says become evident between years one and four.

Why it matters

Linoleic acid (LA) in human adipose tissue has a half-life of roughly 680 days: ~50% remains after 2 years, ~25% after 4 years, ~12.5% after 6 years — 'clean' is closer to a decade than a diet.

Key details

  • Researchers who directly measured adipose tissue found LA in American adults' body fat increased by 136% over the last half century (measurement of tissue composition, not self-reported intake).
  • Stored LA is released during weight loss and re-enters circulation, so past dietary LA can be metabolized again when you lose fat; the author argues this makes the idea of a single 'cheat meal' misleading and reports noticeable physiological changes between years 1 and 4.
Source evidence

Some seriously depressing facts….,

Sama Hoole (@SamaHoole)

The fries you ate in 2024 is still in you today, which is why "everything in moderation" is a sentence that only works on substances that leave.

Linoleic acid has a half-life in human fat tissue of roughly 680 days. Two years to clear half of it. Two more to clear half of what is left.

  • Year 2: half gone
  • Year 4: three quarters gone
  • Year 6: seven eighths gone
  • Clean: closer to a decade than a diet

Sugar is gone by bedtime. Alcohol is gone by Tuesday. This one moves in.

So there is no such thing as a cheat meal. There is a deposit and a two-year mortgage on it, taken out on a Friday night because somebody told you life is for living.

Now the part that should have made the news. Linoleic acid in the body fat of American adults rose 136 per cent over the last half century. Not intake, not survey answers, not a food diary. That is what was found when researchers cut into people and looked. Your grandmother's body fat and yours are two different materials.

And it does not sit there quietly. Every time you lose weight you release it back into circulation, so the oil you fried in during 2019 gets a second run through your bloodstream on the way out. Anyone who has dropped two stone this year has spent the summer metabolising 2022.

The dietitian who tells you one meal will not hurt is technically correct and entirely useless, because nobody has ever eaten one meal.

Six years in, I can tell you the gap between year one and year four is not subtle, and nobody still counting in weeks has felt it yet.

You did not get here in a fortnight. Stop taking advice from people who discuss this in fortnights.

— https://nitter.net/SamaHoole/status/2085727749193253130#m