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c/bloodwork·posted 3 days ago by u/ferritin_low

[Concerning] ferritin 9. i was eating 1,100 calories and calling it discipline.

Concerning

Reference range on my lab is 15–200 ng/mL. Mine came back 9. Haemoglobin was still just inside range, which is why nobody had caught it.

MarkerMonth 0Month 8Range
Ferritin (ng/mL)48915–200
Haemoglobin (g/dL)13.812.112.0–15.5
MCV (fL)908180–100

Every one of those month-8 values except ferritin is technically normal. The trend across three of them is not, and the trend is the finding.

I was eating around 1,100 calories a day, feeling virtuous about it, and losing weight fast. Under-eating is a real risk and this community talks about it far less than it talks about nausea.

266 up / 65 down80% upvoted17 commentsid 1imb4b26 Jul 2026

17 comments

13 in this archive, depth 6

best — the order this archive was captured in

u/lipid_panel_larrybloodwork312 points·3 days ago

The MCV dropping from 90 to 81 while staying "in range" is the textbook picture and it is exactly why single results are less useful than trends. A first-time ferritin of 9 gets treated. A ferritin of 9 with a documented 48 eight months earlier gets taken seriously.

Which is the whole argument for baseline labs. You cannot go back and collect them, and without them everything is a snapshot.

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u/ferritin_lowOP176 points·3 days ago

the baseline was almost an afterthought and it is the only reason the picture is legible.

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u/b12_baseline143 points·2 days ago

get baseline labs before you start. i will keep saying it in every thread until it stops being necessary, which will be never.

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u/low_appetite_lisa121 points·2 days ago

1,100 kcal is not a win and the community reward structure makes it feel like one. faster loss gets more upvotes than sustainable loss.

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u/protein_first_pnutrition104 points·2 days ago

and iron specifically is hard to hit on a small appetite because the best sources are dense and unappealing when you are full after four bites.

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u/ferritin_lowOP96 points·1 days ago

supplementing now, under supervision, and eating deliberately rather than by appetite. it feels like a chore and that is apparently the correct amount of effort.

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u/gentle_correctionMOD132 points·3 days ago

Concerning flair is right. Reminder that nobody here interprets a stranger's results — we can say what a pattern usually means, which is a different sentence. Bring the numbers to whoever ordered them.

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u/hair_shed_hannah104 points·3 days ago

this is very likely the mechanism behind half the hair-shedding threads on this site and almost nobody checks it first.

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u/muscle_cramp_mo84 points·3 days ago

same category: my cramps were sodium, not magnesium, and i spent £40 on the wrong mineral before checking anything.

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u/dizzy_on_standing66 points·3 days ago·edited

and mine was partly dehydration and partly a BP med that had become too strong. edit: three of the four "is this the drug" questions i have asked turned out to be something adjacent.

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u/downvote_magnet-15 points·3 days ago

1100 calories is fine if you are not hungry, hunger is the signal

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u/ferritin_lowOP143 points·3 days ago

hunger is precisely the signal these drugs suppress. that is the mechanism. using it as your intake guide is using a broken instrument.

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[removed]-4 points·3 days ago

[removed by moderator]

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About c/bloodwork

What to measure before you start, what to re-measure, and how to interpret movement without panicking. ApoB over LDL-C, HOMA-IR as a crude free tool, ALT and the fatty-liver story, eGFR noise during rapid loss, and the deficiencies that a 1,100-calorie appetite will hand you.

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