About This Blog

I'm Marcus Webb. I'm not a doctor or a researcher. I'm a software engineer based in London who spent two years of daily 16:8 fasting — and started writing down what actually changed.

Who I Am

I'm 34, living in London, and I work in software engineer. Screen-heavy days, irregular schedules, and the kind of low-grade fatigue that doesn't get flagged on a standard health check.

I don't have clinical credentials. What I do have is a detailed log going back several years, a habit of tracking one variable at a time, and a tolerance for reading research I don't fully understand on the first pass.

Why I Started This

At 34, I was constantly tired by mid-afternoon despite sleeping enough. A colleague mentioned intermittent fasting as a way to stabilise energy. I was sceptical. I tried it for 30 days to prove it wouldn't work — and ended up not stopping.

This blog is that log made public. It is not a research journal. It is a record of what I tested, what I noticed, and what the evidence says when you dig past the headline claims.

How I Track Things

My method is consistent rather than rigorous. I track fasting window adherence, sleep quality (Oura), morning HRV, afternoon energy (1–10 self-report), and weekly body composition. I introduce one change at a time and give it enough time before drawing conclusions.

• Strict 16:8 window — eating window 12:00–20:00, tracked daily without exceptions
• One variable at a time — if I change meal timing or composition, I note it separately
• Sleep and HRV first — subjective energy is useful but sleep data is harder to fake
• Minimum 4 weeks before conclusions — adaptation takes longer than most people expect

What You'll Find Here

Every post is grounded in my own experience and cross-referenced against peer-reviewed literature. I write in first person because these are my observations — not clinical conclusions.

• Window timing and adjustment — how to shift the eating window without crashing
• What breaks a fast — testing coffee, supplements, and electrolytes during the fasted window
• Energy and workout timing — when training fasted works and when it doesn't
• Mistakes I made — the first month was messy; those posts are the most useful

What This Blog Is Not

16 to 8 Fasting Log is not a medical institution, a product company, or an academic publication. I am not a licensed healthcare professional. Nothing here is medical advice. Please read the Medical Disclaimer before acting on anything you find here.

— Marcus Webb, London