The Dark Matter of Nutrition · why your liver is overbuilt营养的暗物质 · 你的肝为什么建得这么大

Place · Level 3 · Macro

营养成分表是缺乏症投下的影子 · 酶的手笨是未知分子的指纹 · 次生代谢物是植物的化学武器 · 好处来自轻微的毒 · 提纯加大剂量把 U 型推过峰顶 · 问错的问题与问对的问题

The label is a shadow

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营养成分表是一道影子

Not one of the molecules that make garlic garlic appears on the nutrition label.

The USDA database lists 69 entries for raw garlic. Ascorbic acid (vitamin C) is there; so are amino acids like alanine. What isn't there is allicin — the molecule that makes garlic pungent and antimicrobial. Nor ajoene. Nor p-coumaric acid. Meanwhile researchers recently counted 6,802 small molecules in raw garlic (Menichetti 2024).

Those 69 rows weren't picked at random. To see why the list looks like this, start with a question about the body: what earns a molecule the word essential?

Essential is the gap between two rates

The answer isn't in the food. It's in you, and it's two measurable rates:

how fast you build ithow fast you spend it
Build faster than you spend, and you needn't get it from food. Build slower, and the shortfall has to be eaten. Build at zero while demand isn't zero, and it's essential: cut off the supply and your stores fall at the rate you spend them, and below some line the step that runs on it stops.

What stopping looks like is visible. Without vitamin C you can't build stable collagen, so gums bleed and wounds split open — scurvy. Without thiamine your nerves and heart can't get at the energy in sugar — beriberi. Niacin and vitamin D each collapse in their own way.

So the label is a medical history

Look at the shape of the sieve: to get on the list, a molecule's absence must cause trouble within weeks to months.

That condition selects a very particular class — molecules your body cannot build, without which some step seizes. Twentieth-century nutrition science found them by following the diseases: first the disease, then the molecule.

Which means the sieve necessarily misses an entire class: molecules whose absence causes no trouble in weeks. They have no deficiency disease, so nobody traced a disease back to them, so they aren't on the list.

Not on the list doesn't mean not in the food, and it certainly doesn't mean nothing happens in you. Allicin and ajoene live in that class. Skipping garlic gives you no disease — which is exactly why they're absent from the label, and exactly why they're easy to treat as nonexistent.

The nutrition label is a shadow cast by acute deficiency disease. The analogy stops there: nobody shrank the list on purpose. It was shaped by a question, and the question was what kills people when missing, not what is actually in here.

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本站提供科普与一般性建议，不替代医师诊断或处方；有症状或正在服药请咨询合格医师。 Educational content, not medical advice — consult a clinician for diagnosis or treatment.

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