You don't do your body any favors undereating and just cause yourself more medical issues. Though sometimes there are underlying issues like thyroid, iron anemia, lack of sleep contributing to issues as well. There can be issues like fibromyalgia causing severe body aches, and that really doesn't have a firm medical test for diagnosis, just pain at pressure points. Have you seen a rheumatologist? Rheumatologists diagnose issues such as fibro, arthritis, lupus that can cause some of those same issues, so you should rule those out too. I have fibromyalgia and when it flares up, it causes me a lot of pain. I am on Cymbalta (prescribed by pdoc though), and that has helped my fibro and neuropathy. And some things like peripheral neuropathy (which can be caused by prediabetes though mine is idiopathic with no definitive cause) can cause issues with being cold. For example, my feet are always cold from the neuropathy even during summer, and I live in Texas. My body is often very cold during my menstrual cycle at the beginning and midway through no matter the season. And if you're at the age for perimenopause that can cause all sorts of hormone issues too.
But undereating makes everything worse. Bad eating habits don't help anything. All that does is slow your metabolism so that your body burns fewer calories daily resulting in weight gain. Though if the restriction is bad enough you do lose weight such as in anorexia & certain ED behaviors; you can look at Holocaust survivors, people living without adequate food sources in 3rd world countries and see what prolonged starvation does to the body. I still have problems associated with ED behavior such as grinding my teeth (especially at night) which I am told started due to a lack of vitamins during my ED. That has caused me a fortune in dental work, so many crowns I can't even count, teeth breaking off, root canals. Better off nipping bad eating habits in the bud; the longer it goes on, the harder & harder it is to recover. And I still fight to be rid of the ED thoughts as I have posted on this forum, so yes, make an effort to eat enough calories even if you are not hungry or you feel you are really overeating. Trust me, your body will feel so much better physically. It also helps sleep problems and your overall mental health.
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Bipolar 1, PTSD, anorexia, panic disorder, ADHD
Seroquel, Cymbalta, propanolol, buspirone, Trazodone, gabapentin, lamotrigine, hydroxyzine,
There's a crack in everything. That is how the light gets in.
--Leonard Cohen
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