Why You Feel Wired but Tired: Low Ferritin and the Nervous System
We often talk about "low energy" as a lifestyle problem. We reach for more caffeine, try to sleep longer, or blame our busy schedules. But for many of us, the problem isn't our schedule, it’s our internal oxygen delivery system.
Iron is the "Invisible Engine." If you don’t have enough, your body simply cannot move oxygen to your brain, muscles, and heart. It is the most common nutritional deficiency worldwide, yet it is frequently misunderstood.
Why "Normal" Isn't Always "Optimal"
The biggest mistake people make is looking at their blood test and seeing the word "Normal." Standard lab ranges for Ferritin (your iron storage) often go as low as 15 or 20 ng/mL. While that might be enough to keep you out of the hospital, it isn't enough to help you thrive.
The Thriving Range: Most functional health experts look for a Ferritin level between 75–100 ng/mL. Most clients I see have ferritin levels of 30-50 ng/mL. They feel ok - but off in some way.
The Red Flag: If you feel "heavy" in your limbs, breathless on the stairs, or perpetually "foggy," your stores might be "normal" but functionally empty.
6 Signs You Are Running on Empty
Persistent Fatigue: Feeling drained even after 8 hours of sleep or hitting a massive "3 pm slump."
Physical Weakness: Feeling "heavy everywhere," particularly in the legs.
Brain Fog: Difficulties with concentration, feeling vague, or "not sharp."
Dizziness: Experiencing "dizzy spells" or lightheadedness when you stand up.
Hair & Nail Changes: Significant thinning/hair loss or brittle nails with white spots.
Restless Legs: An irresistible urge to move your legs or experience cramps during sleep.
Serum Iron vs. Ferritin:
To understand your energy, stop thinking about blood and start thinking about your Smartphone Battery.
Serum Iron (The Charging Icon)
This is the "lightning bolt" on your screen. It shows that iron is currently moving through your cables and into your system for immediate use.
The Role: It keeps the screen lit and the apps running right now.
The Trap: You can be "plugged in" (normal serum iron), but that doesn’t tell you how much actual charge you have stored for the day ahead.
Ferritin (The Battery Percentage)
This is your Stored Iron. It is the actual 0% to 100% charge of your internal battery.
The Role: This is the energy you rely on when you aren't "plugged in", when you’re exercising, working, or getting through your menstrual cycle.
The Outcome: If your battery is at 5% (low ferritin), your phone will automatically enter "Low Power Mode." It dims the screen, slows down the processor, and stops background tasks.
Why You Feel "Wired but Tired"
When your internal battery (Ferritin) is stuck at 5%, your nervous system starts to panic. It knows it doesn't have the "charge" to get you through the day, so it pumps out adrenaline to keep you moving.
This is the "Wired" part. You are running on emergency backup power (stress hormones) because your actual battery is depleted. You aren't "anxious" in your head; your body is simply trying to keep a 5% battery alive by over-revving the engine.
The "Pea" Revolution & Absorption Hacks
You can eat all the steak and spinach in the world, but if you have Absorption Blockers in your system, you aren't getting the iron.
The Blockers: Avoid Coffee/Tea (tannins), Dairy (calcium), and unsoaked grains (phytic acid) within 2 hours of your iron-rich meals.
The New Science: New research into Hydrolysed Pea Protein has found that enzymes can create "iron-binding peptides." These act as a shield, making plant-based iron up to 15 times more absorbable. (And don't worry, this is achieved through natural breeding and enzymes, not GMOs).
How to Build Your Iron Today
The Vitamin C Rule: Always pair iron with Vitamin C (lemon, berries, peppers) to "unlock" absorption.
The Liver "Ice Cube" Hack: Freeze fresh liver in ice trays. Grate one "cube" into stews or smoothies, you won't taste it, but your Ferritin will soar.
Cast Iron Cooking: Using a cast-iron skillet for acidic foods (like tomato sauce) leaches beneficial iron into your meal.
Daily Goals: How Much Do You Need?
Women (19–50)
18mg
Pregnant Women
27mg
Men / Post-Menopause
8mg
Deficient/Anaemic
80–100mg*
*Note: If you are already deficient, food alone is often not enough. This is where supplements like Iron Bisglycinate or Chicken Liver Capsules become essential. You need around 80mg of elemental iron for low iron cases. You need to iron to build storage, plus iron for everyday use.
Top 5 Iron-Rich Foods
Beef Liver (100g): 6.5mg
Oysters (6 Medium): 5.9mg
Lentils (1 Cup cooked): 6.6mg
Spinach (1 Cup cooked): 6.4mg
Pumpkin Seeds (30g): 2.5mg
The Recovery Phase: Charging your battery
If your Ferritin is currently sitting below 30 ng/mL, eating an extra bowl of spinach won’t be enough. To move the needle from "Deficient" to "Optimal," you need a therapeutic recovery plan.
The 80mg–100mg Target (elemental)
When you are in a state of deficiency or anaemia, specialists often recommend 80mg–100mg of elemental iron per day. This is a high dose designed to force the body to start restacking its storage "vault."
Look for Iron Bisglycinate. It is a "chelated" form of iron, meaning it’s bound to an amino acid. This makes it much gentler on the stomach and significantly reduces the risk of constipation compared to standard ferrous sulfate.
The "Every Other Day" Science (Hepcidin)
Recent research has revolutionised how we take iron. Taking a high-dose iron supplement every single day can actually backfire.
When you take a large dose of iron, your liver produces a hormone called Hepcidin.
Hepcidin’s job is to stop iron absorption to prevent toxicity. It stays elevated for about 24 hours.
If you take iron every morning, your Hepcidin from yesterday might still be high, blocking today's dose. By switching to alternate-day dosing (e.g., Monday, Wednesday, Friday), you allow Hepcidin levels to drop, meaning you actually absorb more iron with fewer side effects.
My Top 3 Supplemental Supports
If you aren't ready for a heavy synthetic pill, these are the "Bio-Identical" ways to hit those higher numbers:
Chicken Liver Capsules: A fantastic way to get "Heme" iron (the most absorbable kind) without the taste of organ meats.
Iron Bisglycinate: As mentioned, the gold standard for high-dose supplementation with minimal digestive upset.
Hydrolysed Pea Protein with Iron: Using the new "enzyme-shield" technology we discussed earlier to ensure the iron survives the trip through your stomach. Dr Libby was one of the first to pioneer this blend - Bio Blends
What are the symptoms of low iron in the nervous system?
Restless Leg Syndrome (RLS) or "fizzing" limbs.
Internal anxiety or feeling "on guard" without a mental cause.
Brain fog and poor concentration.
Sensitivity to light, sound, or touch.
Sleep disturbances and waking up unrefreshed.
Ready to stop the exhaustion and reset your system?
[Join the 5 Day Nervous System Reset]
Frequently Asked Questions
Can I have low iron if my Haemoglobin is normal?
Absolutely. This is the most common trap. Your Haemoglobin (the "Cash in your Pocket") can look perfect while your Ferritin (your Battery Charge) is at a critical 5%. If your Ferritin is under 30 ng/mL, your nervous system is likely already in "Low Power Mode."
Why do my restless legs get worse the week before my period?
This is the Luteal Phase Crash. When estrogen drops, it takes your dopamine efficiency with it. If your iron stores are already low, your brain lacks the "fuel" to manufacture enough dopamine to keep your legs still and your mind calm.
Will an iron supplement make me constipated?
Traditional iron often does because it isn't absorbed well, leaving "scrap metal" in your gut. By using the Every Other Day protocol and choosing Iron Bisglycinate (a gentle, chelated form), you significantly reduce digestive upset.
Can I just eat more spinach to fix a deficiency?
Spinach is great, but its iron is locked behind phytic acid. If you are truly deficient (Ferritin under 20), you would need to eat roughly 2kg of spinach a day to hit a recovery dose. This is why targeted supplementation, or "Liver Hacks," is necessary during the rebuilding phase.
How long does it take to feel "recharged"?
Because we are rebuilding a biological "Battery" from the ground up, it typically takes 3 to 4 months of consistent dosing to see a significant rise in Ferritin. However, many women report that the "internal fizzing" starts to settle within the first few weeks of calming the nervous system.