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12 Signs You’re Undereating – The Fed and Fearless Podcast Episode 22

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Could you be undereating and not even know it? If you have more than one of the twelve common signs and symptoms I’m talking about today, you might need to take a look at your caloric intake!



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signs you may be undereating

On today’s episode, I’m talking about 12 signs that you could be undereating.

Did you know that it’s possible to be undereating for so long that you actually stop losing weight? This is one of the reasons why so many people believe they can’t be undereating since their weight isn’t going down, which often leads them to eat even fewer calories. 

You should be having a bowel movement at least once a day. If it’s less often, this could be a sign that you’re not eating enough calories. Another sign is if you’re cold all the time since your body isn’t getting enough calories to keep it warm.

One of the biggest signs of undereating, and one that I work with a lot of women for, is the lack of a menstrual cycle. If you’re malnourished, your body will think that you’re not in a position to bear and raise children, common during times of famine, so will naturally stop producing a period.

Have you ever found that after a challenging mental day, you’re feeling even more tired than if you do physical activity? This is because your brain uses glucose, a type of sugar, to function – and thinking can take a lot out of you!

The last sign is a surprising one: getting up to pee during the night, even once, could indicate a lack of calories in your diet. When you’re eating enough, you should be sleeping through the night. And your bladder, along with most of your other organs, should be resting, too. 

Are you finding yourself checking off more than one of the items on this list? Are you someone who used to feel this way and find that eating more helped resolve these issues? Let me know in the comments below! 


Got a question you’d love to hear me answer on the show? Leave me a voice message here!



  • The role of cortisol in our body
  • Circumstances that could lead to undereating
  • How weight stability might not be an indication that you’re eating enough
  • How many times a day you should go to the bathroom
  • The number your basal body temperature should never drop below
  • How inadequate calorie intake can affect your menstrual cycle
  • Why we feel more tired when we are using a lot of brainpower
  • What it can mean if you’re getting up to pee during the night



“If undereating is creating a chronic stress response in your body, dropping those stress hormones by eating more is something that initially can make you feel more tired.” (19:32)

“The truth is that being underfed chronically keeps your nervous system in a fight or flight mode. So, essentially you’re body is going to think anything that’s a threat is going to be much larger a threat than it actually is and it’s going to have that heightened stress response, even in the face of simple daily stressors..” (37:22)

“In a perfect world, if we’re not having any stress at all, our cortisol should be at it’s highest point within 30 minutes of waking up. So if you’re having a spike in cortisol at night when you’re supposed to be asleep, this can actually wake you and your organs up.” (45:31)



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  1. I can relate to almost every symptom you’ve shared, and it’s crazy to reflect on how long I’ve been truly under-eating and the health issues that have emerged from that; I have never connected anxiety, sleep disturbances, being cold, hair thinning, and my tipping point, loss of period, to my diet! Thanks for being such an eye-opener, Laura.