Vitamin D, Fatigue & Midlife: The Reason You Still Feel Exhausted After 40

Are you exhausted even though your labs are “normal”?
Do you feel wired at night, drained during the day, foggy, achy, and wondering what happened to your energy after 40?

In this episode of Discover Your Personal Power: Hormones, Metabolism & Midlife, Peggy Moore, RN and Functional Medicine Practitioner, breaks down the surprising connection between Vitamin D, fatigue, hormones, metabolism, circadian rhythm, inflammation, and midlife energy crashes.

Peggy explains why Vitamin D acts more like a hormone than a vitamin, why so many women are deficient or functionally low, and why “normal” lab ranges don’t always mean your body is thriving.

This episode dives into:

•  Vitamin D deficiency symptoms in women over 40 
•  Why midlife women often feel exhausted despite normal labs 
•  The connection between Vitamin D, hormones, metabolism, and inflammation 
•  How stress, poor sleep, indoor lifestyles, and hormonal shifts impact energy 
•  Vitamin D and blood sugar regulation 
•  Circadian rhythm and morning sunlight exposure 
•  Why sunlight matters for mood, energy, sleep, and nervous system regulation 
•  The difference between surviving and actually feeling good 
•  Simple lifestyle shifts that support energy naturally 

Peggy also explains:

•  Why your body is not broken 
•  Why pushing harder is not the answer 
•  How your body adapts to stress before it crashes 
•  Why small consistent changes matter more than perfection 

If you’re tired of being told everything is “fine” while still feeling exhausted, this episode will help you better understand your physiology and start supporting your body instead of fighting against it.

Mentioned in This Episode

•  Circadian rhythm 
•  Morning sunlight exposure 
•  Nervous system regulation 
•  Blood sugar stability 
•  Midlife metabolism 
•  Hormonal shifts after 40 
•  Functional medicine approach to fatigue

 If you found this episode helpful, follow the podcast and share it with a friend who may need it. 

Check us out on Youtube:  https://www.youtube.com/@peggymoorehealthandwellness

Website: www.moorefunctionalhealthandwellness.com

Facebook: https://www.facebook.com/Peggy.MooreHealthandwellness

Instagram: https://www.instagram.com/moorehealthandwellness/

Linkedin: www.linkedin.com/in/peggy-moore-5b295247

Transcript

SPEAKER_00 0:00

Hi my friends! Welcome back to Hormones, Metabolism, and Midlife. My name is Peggy Moore, and I'm a registered nurse and functional medicine consultant, and basically your translator for what your body is actually doing after 40. Because let's be honest, midlife can feel like your body stopped following all the rules. The weight changes, the sleep changes, your energy disappears, and half the time you're left wondering what is happening to me. That's exactly why I'm here, to help you understand what's going on inside your body so you can stop blaming yourself and start working with your physiology instead of against it. So, my friends, please stop thinking I just need to push harder. I just need to do more. Because I want you to know this is not a discipline problem. It's a physiological situation. And I'm going to show you how to work with your body instead of fighting against it. Today, we're talking about one of the most common things I see in midlife women: vitamin D and fatigue. Maybe lately you've been feeling exhausted, no matter how much sleep you get. Your body feels heavy, your mood feels off. You're dragging yourself through the day like a phone stuck on an 8% battery. You wake up already tired, you need caffeine just to become a functioning member of society. And by 2:30 in the afternoon, you're staring at the computer, wondering if lying face down on the floor counts as self-care. And then somehow around 9 p.m., your body suddenly decides, wow, now we have some energy. And you're like, hey girl, where was this energy at 10 a.m. this morning when we were forgetting why we walked into rooms? So you finally decide to get some labs done, hoping maybe there's an answer hiding in there somewhere. Your provider decides to check a vitamin D level. And honestly, there's a reason doctors often check vitamin D first for symptoms like fatigue, low mood, body aches, and low energy. Low vitamin D is incredibly common. Studies actually estimate that around four out of 10 adults in the US are deficient. And the risk gets even higher in midlife women because of hormonal shifts, stress, indoor lifestyles, and changes in body composition. Vitamin D affects your energy, muscles, mood, immune function, inflammation, and even metabolism. Plus, it's an easy lab to run and relatively easy to correct if levels are low. But what if your levels come back normal and you still feel terrible? Your provider says, good news, your vitamin D levels are normal. And you're sitting there thinking, well, that's amazing for my lab work. But unfortunately, my actual body did not get the memo. Because many women leave those appointments feeling confused. I get it. Like, if everything's normal, then why do I feel like a human stressed potato? So today that's why we're going to talk about vitamin D, what it actually does in the body, why it matters so much in midlife, and why normal labs do not always mean you're feeling great. So first things first, vitamin D is basically your body's little manager. Vitamin D is technically called a vitamin, but honestly, it behaves more like a hormone. Vitamin D is involved in energy, mood, muscles, immune system, blood sugar regulation, inflammation, and even thyroid health. This is not just about bones. Vitamin D receptors exist all over the body. It's kind of like Wi-Fi when the signal gets weak and weird and things start glitching. Low vitamin D symptoms are also often sneaky, sometimes not very dramatic. They just, you just slowly start feeling tired, achy, foggy, moody, weak, and run down. You wake up tired, you hit the afternoon wall, your body feels older than it should. And many women start to think, I guess this is just aging. Maybe, but maybe not. Honestly, modern life is terrible for vitamin D. We work indoors, we drive everywhere, we wear sunscreen, we stay stressed, and we spend half our lives under fluorescent lighting. Meanwhile, your body is over here whispering, ma'am, I'm designed for sunlight. Honestly, humans are kind of like houseplants with anxiety at this point. We need sunlight, water, movement, sleep, and less stress. And instead, we're indoors all day under fluorescent lighting, eating protein bars and parking lots while answering emails. As a nurse, I thought I would go back and ask my elders to help guide me. Florence Nightingale, the mother of modern nursing, strongly believed that fresh air and sunlight were essential for healing. During the Crimean War, she noticed soldiers recovered better in clean environments with access to light and ventilation. She actually wrote that sunlight was not just important, but essential for recovery. Now, obviously, Florence Nightingale did not know about vitamin D receptors or circadian rhythm back in the 1800s, but she understood something powerful. The human body was designed to need light. And honestly, modern life has pulled many of us so far from that. We wake up in the dark, drive to work, sit indoors all day, stare at screens, and then wonder why our energy, mood, and sleep feel completely off. And during midlife, things get even trickier because you've got to add in hormone shifts, stress, inflammation, increased body fat, poor sleep, and metabolic changes. All these things can affect how vitamin D levels are used in your body. So, yes, you can technically be normal on paper and still not feel great. So let's talk about these vitamin D labs. Now, when your doctor checks your vitamin D, they're usually looking to see if you're low enough to officially be considered deficient. But here's the important part: there's a big difference between your body is surviving and your body actually feels good. And a lot of women get told their labs are normal while still feeling exhausted, foggy, icky, and drained. Because sometimes your labs may be technically okay on paper, but not necessarily optimal or how you want to feel in real life. And honestly, we're not trying to create perfect labs. We're trying to create better energy, better recovery, better resilience, and a body that actually feels good to live in. Vitamin D does so many things in the body. Let's talk about that. Vitamin D helps with the immune system. Think of it like the volume control. It helps the immune system know when to activate, calm down, and stop overreacting, which is one reason vitamin D often comes up in conversations about thyroid issues, inflammation, autoimmune conditions, and chronic fatigue. That's one piece of the puzzle. It does not magically cure everything, but the body works like a team. And vitamin D is one of those players. It helps certain processes in the body work the way that they're actually supposed to work. It's kind of like trying to build the huge Harry Potter Hogwarts castle out of Lagos. You're expecting this beautiful magical castle, but a few important pieces are missing. So the whole thing ends up looking more like Hagrid's hut. That's how the body works sometimes. One missing piece may not completely break everything, but it can absolutely affect how well the whole system functions. Next, vitamin D and blood sugar. Here's another interesting piece. Vitamin D affects insulin and blood sugar regulation. So if you're dealing with cravings, body weight, energy crashes, or hangry in the afternoon, vitamin D could be a piece of a missing puzzle. Not the only piece, but part of the bigger picture. Now, I do want to make sure you hear me when I say, please do not hear this episode and immediately order mega ultra vitamin D 50,000 super strength from the internet. Vitamin D is actually fat soluble, which means your body stores it, and too much can become harmful, and more is not always better. This is why testing matters. But there is some good news. There are natural ways to support vitamin D. There are foods that include salmon, sardines, egg yolks, fortified milk, and cod liver oil. But honestly, food alone is usually not enough for many women today. And that's why deficiency is so common. The number one best source of vitamin D is sunlight. Even short amounts of sunlight exposure can help your body naturally produce more vitamin D. And getting outside regularly, walking, gardening, morning sunlight can also support your circadian rhythm, mood, sleep, and your nervous system. Now, whenever I talk about sunlight and vitamin D, somebody immediately says, but what about sunscreen? And honestly, this is where the conversation can get just a little complicated. Because yes, we absolutely want to reduce the risk of sick skin damage and skin cancer. And I'm not telling you to go bake in the sun like a rotisserie chicken at Costco. That's not the assignment. But at the same time, our bodies were designed to interact with sunlight. Sunlight helps regulate processes in the body, it helps to regulate vitamin D, circadian rhythms so that you sleep better. It helps with mood, hormones, and your nervous system. The controversy comes from the fact that sunscreen can reduce the skin's ability to make vitamin D. Now that doesn't mean to throw away the sunscreen, it just means balance matters. Some experts believe that short period of sensible sunlight exposure, especially in the morning or late afternoon, helps to support health before applying sunscreen. Just a simple 10 minutes can help. I think so often in modern life, it has pushed us into extremes, and either it's never seen sunlight or burning at the beach for six hours. But your body wants something more reasonable and in the middle. Fresh air, natural light, regular outdoor time, and supporting your body instead of hiding from the sun completely. And remember, I'm not saying go lay outside covered in baby oil like it's 1987. I've been there, I've done that. Let's not do that. We are talking about reasonable sunlight exposure, a short morning walk, having coffee outside, sitting in the sun for a little bit while your nervous system remembers who you are, in fact, a human being and not an exhausted office goblin. When sunlight hits your eyes and your skin, especially in the morning, it sends a signal to the brain that basically says, it's daytime, time to wake up, time to create energy, time to regulate hormones. This helps support your circadian rhythm, which is your body's internal clock. And your circadian rhythm affects way more than just sleep. It influences cortisol patterns, melatonin production, insulin sensitivity, hunger hormones, and body temperature. This is one of the reasons people often feel better after sitting outside, walking in the morning light, gardening, or spending time in nature. It's not just in your head. Your body is responding to real biological signals from the environment. So if you're listening to this episode and thinking, okay, what do I actually do with this information? Start simple. Open the blinds in the morning, step outside for 10 minutes, take a walk after dinner, eat more nutrient-dense food, get your labs checked if you've been exhausted for a long time. Small, consistent signals matter more than dramatic perfection. And remember, midlife is just a time of transition. Most of the time, your body is just trying to protect you, adapt, and survive the environment that it's been given. If you're a woman in midlife and you're finding that the rules suddenly change, like the weight is shifted, sleep is sketchy, and your energy is drained, hop on a midlife metabolism clarity call with me. And together we'll identify one missing nutritional or lifestyle support your body may be craving right now. And one simple shift to help you feel more energized, emotionally steady, and like yourself again. If this episode helped you connect the dots between metabolism hormones and midlife, hit the like button and subscribe so you don't miss an episode. And share this with a friend who just may need a little more sunlight too. Because we midlife women have to stick together. This is Peggy Moore with Metabolism, Hormones, and Midlife. See you next time.