Why I Treated This Like a Network Problem

I've been interested in intermittent fasting for a while but avoided the fitness industry's version of it — which comes wrapped in pseudoscientific jargon, supplement recommendations, and an intensity that makes it feel like a personality rather than a protocol. So I did what I do with new technology: I read the actual research, picked a simple implementation, tested it, measured what I could, and adjusted based on results.

Six months later I have opinions. This is what I found.

The Protocols I Tested

16:8 — Eat within an 8-hour window, fast for 16. The most common implementation. I started here. For most people this means skipping breakfast and eating from noon to 8pm. It's the easiest to maintain socially.

18:6 — Narrower window, slightly more aggressive. I ran this for about ten weeks. The difference from 16:8 was noticeable in the first hour of each morning — more clarity, slightly less background noise in my thinking. Also more constraint: a 6-hour window makes group dinners logistically annoying.

24-hour fasts — Once a week for about eight weeks. Harder than expected psychologically, easier than expected physically. After the first four or five you realize most of the hunger is habitual rather than physiological — it appears at your usual meal times and disappears if you wait 20 minutes.

What Actually Changed

Physically: I lost weight. Not dramatically — consistently, about half a kilogram per week while running 18:6. The mechanism is simple: compressing the eating window reduces total calories without requiring calorie counting. You can eat a lot in 6 hours but it's harder to eat as much as you would across 14.

Cognitively: the mornings improved noticeably. This was unexpected and then consistent enough that I believe it. The first 2-3 hours after waking up are clearer when I haven't eaten. I don't know the exact mechanism and I'm skeptical of the "metabolic switch" narratives the fasting community pushes — but the effect is real enough that I structure difficult work in the morning now.

Relationship with hunger: this was the most interesting change. After about six weeks, hunger became less urgent. It went from "I need to eat now" to "I could eat soon." This seems to be the adaptation the research describes. Ghrelin levels stabilize. The panic response to hunger diminishes.

What Didn't Change and What the Industry Gets Wrong

The eating window is not magic. If you eat garbage in a 6-hour window, you lose some of the benefits. The fasting community implies that the timing creates metabolic effects powerful enough to override food quality. This is broadly not true. Fasting makes it easier to eat less. It doesn't make bad food good.

Supplements are mostly irrelevant for a basic protocol. Black coffee and water are the only things that matter. The entire ecosystem of fasting supplements — BCAAs, electrolytes, "fasting accelerators" — is largely noise unless you're running very extended fasts or doing serious athletic training alongside.

The social friction is real and worth acknowledging. Eating in a narrow window clashes with breakfast meetings, late dinners, and the social expectation that food is how you connect with people. I made peace with the fact that I break the protocol occasionally for good reasons. A single meal outside the window doesn't undo anything.

Where I Landed

I currently run 16:8 most days with occasional 18:6 when I want the morning clarity without social constraint. I don't track macros, I don't count calories, and I don't use any supplements. The protocol is: don't eat before noon, stop eating by 8pm, drink coffee and water until noon, eat normally otherwise.

That's it. The fitness industry would like to sell you more complexity than this. I don't think more complexity helps.