this post was submitted on 21 Jan 2026
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Off My Chest

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I've always been underweight, my entire life. Even as a teenager. I've not been able to get above 125, and at the moment, I'm at 103. My BMI is 14.8. I know I need to eat at least double the calories, but I get nauseous if I eat too much. I'm also lactose intolerant and allergic to tree nuts, so it makes it hard to supplement with protein shakes. I tried the fairlife protein shakes but I think my digestive tract doesn't agree with monkfruit.

I don't know what to do. I'm tired of feeling weak all of the time, and having no energy. It feels like my bones themselves hurt. I have a doctor's appointment in a couple of weeks where we're going to discuss testing my thyroid, but I'm feeling like I'm damaging my body beyond repair at the age of 29. I already broke my leg once. I have an implant from it, and the surgeon was very concerned about my weight and that I might have osteoporosis.

This is mostly a ramble. I'm gunna go eat spoonfuls of peanut butter and try to make myself feel better for awhile. If you have any tips, please advise. Thank you.

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[–] shittydwarf@piefed.social 14 points 1 day ago (1 children)

Strength training can really help bone density, but you'll need to eat to grow. Lots of peanut butter in your future. There is peanut butter based protein powder

[–] underweight_twig@piefed.social 8 points 1 day ago (1 children)

I didn't know about peanut butter protein powder, thank you.

[–] xtr0n@sh.itjust.works 5 points 1 day ago

There are many different types of protein powders: soy, pea, hemp, pumpkin seed. It’s hard to find sample sizes so the trial and error to find one that doesn’t bother your stomach will be a bit of pain in the butt.

There are also protein bars, which can be a little high in sugar and calories, but if they don’t upset your stomach, they might be a good small on the go snack. It might be a little tricky finding one without lactose and tree nuts, but once you find one that you tolerate well, you can order them by the case.

Eggs, tinned fish and tofu are all huge staples for folks trying to up their protein intake.

Hopefully the doctor will figure out what’s causing your struggles. Good luck.