The Cold Truth Nobody Mentions
Twenty-four hours into a 44-hour water fast and I’m layered up like it’s January. Thermals. Indoors. In mild weather.
Bloody freezing to the bone.
But here’s the thing: this isn’t a problem. It’s a signal. When your body switches from burning glucose to burning fat, your metabolism shifts down a gear. Not permanently — just while it’s doing the work. Energy gets redirected to breaking down stored fat. Less heat production, more fat burning.
The cold? That’s your body doing exactly what you asked it to.
Day 1. Monday. 13 stone 11. Down 4.5 stone since Boxing Day 2023. Mood solid, energy steady, mind clear. No hunger drama — just the gentle hum of ketones starting to tick up.
The Numbers: Fuel Switching in Real Time
Morning biometrics tell the story:
- Glucose: 5.6 mmol/L
- Ketones: 0.7 mmol/L
- GKI (Glucose Ketone Index): 6
What does that mean? Glycogen stores are running low. The body’s reaching for fat. Not fully into ketosis yet — that’ll ramp up over the next 12-24 hours — but the switch is happening.
Think of glycogen like your phone battery. When it drains, your body switches to the power bank you’ve been carrying around but rarely using: stored fat. Day 1 is the transition phase. The battery’s low, the power bank’s warming up.
Sleep last night was 8 hours, solid and restful. That’s refeed recovery doing its job. Body’s been rebuilding from the last training block. Now it’s ready to burn again.
Movement Strategy: Keep the Hinges Oiled
Fasted training doesn’t mean brutal intensity. It means smart movement.
This morning:
- 25 minutes rucking with 25 kilos on my back
- 100 squats, 100 lunges
- Light 30-minute walk without the weight
No need to go mad. Just keep things moving. Resistance work preserves muscle while fasting accelerates fat loss. Walking keeps circulation steady and mood lifted.
Movement also helps manage the cold — gets blood flowing, warms you up temporarily. But the thermals? Still needed.
The Transformation Timeline
Current measurements (Day 1):
- Chest: 43.5 inches
- Waist: 40.5 inches
- Hip: 40 inches
- Neck: 15 inches
Boxing Day 2023 baseline:
- Weight: 18 stone
- Medications: 5 (asthma inhalers, statins, ezetimibe, allopurinol, cetirizine)
- Chest: Pushing 48 inches
- Clothing size: XXL (and barely fitting)
February 2024: Stopped all medications. Bloods reviewed, no issues flagged.
Today: 13 stone 11. Zero meds. Waist shrinking month on month.
The before photos? Barely exist. I avoided cameras. Too embarrassed about my size to document it properly.
What This Means For You
The cold isn’t a failure. It’s a feature.
Your body isn’t broken when you feel cold during a fast — it’s conserving energy while pulling from stored fat. The discomfort is proof the system’s working.
Here’s what Day 1 teaches:
Ketones rise slowly. You won’t flip into deep ketosis overnight. It’s a gradual shift as glycogen depletes.
Mood stays stable. No dramatic energy crashes if you’ve refed properly beforehand. Sleep and recovery matter.
Movement helps. Light resistance work + walking keeps muscle engaged and circulation steady.
The cold is temporary. Once ketones ramp up (Day 2-3), body temperature often stabilises. It’s the transition that feels coldest.
Track the data. Glucose, ketones, GKI, weight, measurements — all logged. Patterns emerge when you track consistently.
🎯 Key Takeaways
- Feeling cold on Day 1 is normal — Your metabolism shifts to conserve energy while burning fat
- Fuel switching takes time — Ketones at 0.7 show the transition happening, not a problem
- Movement matters during fasts — Light resistance + walking preserves muscle and steadies mood
- Sleep drives recovery — 8 hours solid means body’s ready to fast effectively
- 4.5 stone lost, zero meds — Transformation happens through consistency, not perfection
Ready to Start Your Own Fasting Journey?
If you’re curious about fasting but unsure where to start, the 14-Day Rhythm Reset Guide walks you through the basics — including how to manage the cold, track your numbers, and avoid common pitfalls.
👉 Get the 14-Day Rhythm Reset Guide (free)
💪 Want ongoing support? Join Rhythm Club for £30/month (includes FREE app access, community, and weekly accountability calls)
🔽 Read the Video Transcript
“Day 1 of a fast and I’m wearing thermals indoors. Freezing cold to the bone — and that’s exactly what’s supposed to happen. Here’s why.”
“Day 1. Monday. 13 stone 11 — down 4.5 stone since Boxing Day. 24-hour into a 44 hour water fast, steady as she goes.”
“Woke at 8. Clear head, solid mood — 8 out of 10 across the board. No hunger drama, just a gentle hum of ketones starting to tick up.
Morning numbers: glucose 5.6, ketones 0.7, GKI at 6. That’s the body switching fuel — glycogen’s running low, so it’s reaching for fat.
Spent 25 Minutes with 25 kilos on my back. doing 100 squats, 100 lunges.
Then a light 30-minute walk without the weight.
Movement keeps the hinges oiled — no need to go mad, just keep things moving.
But bloody hell, the cold. Thermals all day. That’s fasting for you — metabolism slows a fraction to preserve energy. Not a problem but it felt like a lot more than a fraction, just a signal the body’s doing its job.”
“Measurements today: 43.5-inch chest, 40.5 waist, 40 hip, 15-inch neck. All logged, all going to be tracked.
Boxing Day 23: 18 stone and a touch , 5 medications, chest pushing 48 inches. I was in a size XXL
very few photos to embarrassed about my size to take any !
Now: 13.11, zero meds since February 2024, waist shrinking month on month.
“Quick reminder: I’m not your doctor. If you’re on meds or managing conditions, chat to your GP first.”
Sleep last night? 8 hours, solid and restful. That’s the refeed recovery kicking in — body’s been rebuilding, now it’s ready to burn again.”
“Here’s what I’m learning: the cold isn’t a failure — it’s a feature. Your body’s conserving energy while pulling from stored fat. It’s not comfortable, but it’s proof the system’s working.
“Living this journey? The 14-Day Rhythm Reset maps the rough patches and the wins. Grab it free — link below.
And if you’re curious about the cold, the ketones, or what GKI actually means, hit subscribe. I’m tracking every day.”
⚠️ Important: This is educational content based on evidence and personal experience. It is not medical advice. Speak to your GP before making changes to your fasting pattern, diet, or medication.⚠️
Questions? Email hello@waymorethanweightloss.com
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