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Weight loss chat

A space to talk openly about weight loss journeys and challenges. Mumsnet hasn't checked the qualifications of anyone posting here. You may wish to speak to a medical professional before starting any diet.

GP refusing iron and B12 testing

78 replies

Lemonthyme · 16/03/2026 09:53

I'm so fed up with my GP. Looking back through my test results, My iron and B12 levels were on the low end of the normal range 2 years ago. I'm struggling with energy, weight loss and feeling cold. Recently had some blood tests and the GP didn't bother to repeat them.

He's saying because they were in spec it's fine despite there being loads of evidence out there that people who exercise a lot need more than scraping the bottom of the range.

I have a GP appointment soon and he's refusing to repeat these tests before I see him. After my last appointment he referred me to the county "weight loss service" who aren't accepting patients anyway but helpfully sent me advice on diet and exercise (I exercise 5-7 days a week already and already eat healthily and drink no alcohol).

To say I'm p---ed off with this idiot is understating it. We have poor provision where we live for GPs so I can't even move practice (I'm outside the catchment of other practices).

I'm perimenopausal but utterly f-ked off by being gaslit by male GPs who think "eating less and moving more" is a magic wand for all weight loss despite the fact that most people find that advice really hard to follow but I'm one of the unusual cases where I AM ACTUALLY DOING IT ALREADY!

Since my last consultation, no thanks to him, I read up on B12, ferritin and how that can elevate HbA1c results (mine were 5.8% despite my lifestyle) but in any case am trying 1 x 24 hour fast per week which so far DOES seem to be helping, albeit I'm pretty knackered. Possibly glycogen depletion but if my HbA1c is high genuinely, what is the alternative? I just want some f-king advice that isn't bloody patronising. Is that too much to ask?!

The point in asking for the tests is because you can often have absorption issues so supplementation may not work.

Why does it feel that as a middle aged woman in the UK you're on your own when it comes to health? Drives me potty.

OP posts:
Carelessebba · 27/03/2026 18:00

Lemonthyme · 26/03/2026 11:59

Results - Ferritin absolutely fine. B12 low. Not quite at deficiency level but low enough to be in the "if having symptoms recommend supplementation" range (and a quick google puts active people like me as needing more than that still) so started a mouth spray today (thank you whoever mentioned it as the evidence is MUCH better than tablets).

I did a bit of Gemini doctor today though, please don't judge me, see above for evidence my GP is not great. But what I found really interesting is the links between B12 and cold intolerance and tiredness but also breathing pattern disorder (which I was diagnosed with as part of long covid). It's given me the kick up the bum I've needed to get some B12 spray (bought this morning and started as soon as I walked out of Supadrug) and restart breathing exercises.

Let's see if this makes a difference? Glad I didn't start supplementing though till the results as I'd have done iron as well which I don't need and too much iron can do more harm than good. But what is also interesting is a lot of the foods I eat which are high in iron are also high in B12 so it does suggest an absorption issue but I wouldn't have known about the sprays / sublingual dosing if it hadn't been for MN so thanks for that. My GP certainly isn't sharing this information. Expensive but if it works it will be 100% worth it.

Excellent news that your iron is good.
When it comes to B12, deficiency and sufficiency are not the same. Hopefully, your temperature management will get better.

Lemonthyme · 27/03/2026 19:33

Carelessebba · 27/03/2026 18:00

Excellent news that your iron is good.
When it comes to B12, deficiency and sufficiency are not the same. Hopefully, your temperature management will get better.

Thanks. Not sure if it's placebo but I am already starting to feel like I have a bit more energy.

OP posts:
thenewaveragebear1983 · 31/03/2026 22:17

Mine were absolutely bottom on the normal range and I felt absolutely dreadful. Tired all the time, falling asleep at my desk, hair falling out. In the end I just got the prescription strength ferrous sulphate from the pharmacy and took 2 a day, and I now take alternate days. I take b12, vit d and biotin for my hair and after 3 months I feel 100 times better.

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