I·Fuel switch
Ketosis
How short fasts shift fuel from glucose to ketones — and why sardines preserve the shift instead of breaking it.
Read the evidence
Evidence · Ritual · Reset
Three days. One food.
A complete metabolic reset.
The science-grounded system for using short sardine fasts to drop visceral fat, restore insulin sensitivity, and clear inflammation — without losing muscle.
Built by a 20+ year body hacker who tested every cycle on himself first.
Three mechanisms, in plain English.
Every claim on this site routes back to a primary source. No appeals to authority, no podcast hot-takes — just the literature.
II·Inflammation
Omega-3
EPA and DHA drive the inflammation-clearing and visceral-fat-mobilizing side of the protocol. The data, with citations.
Read the evidence
III·Cellular
Autophagy
Cellular housekeeping during fasting windows. What the literature actually shows, what it does not, and where short protocols sit.
Read the evidence
Three variants. One food.
Same ingredient. Different intensities. Pick the right one for where you are.
I·On-ramp
3-Day Reset
The variant nearly everyone starts with. Done four times a year, it is enough to keep insulin sensitivity honest.
Read the 3-day protocol
II·Standing baseline
5-Day Deep
The standing monthly baseline for engaged practitioners. Deeper ketosis, fuller autophagic window, harder refeed.
Read the 5-day protocol
III·Advanced
7-Day Extended
The advanced cycle. Once or twice a year, with biomarker tracking. Not a starting point.
Read the 7-day protocol
Citation-grade research, in public.
We track 50+ cited primary sources on sardine fasting, ketosis, omega-3, and metabolic flexibility — updated weekly. Every source gets its own indexable page. The science stays free for everyone.
“Even short, repeated fasting periods improve metabolic flexibility independent of weight loss.”
N=1·Proof of practice
“I’ve done dozens of these cycles. This is what actually works — and what the literature actually says about why.”
Get the 3-Day Sardine Reset Cheat Sheet
A free 4-page PDF: protocol overview, shopping list, day-by-day at a glance, refeed rules, and when to stop.
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Frequently asked.
Why sardines specifically?
Sardines are one of the few foods that supply complete protein, EPA/DHA omega-3s, calcium, and fat-soluble vitamins in a single low-mercury, shelf-stable package. That combination keeps a short fast nutritionally honest in a way water-only fasting cannot. We track the primary literature on each of those claims in the research library.
How is this different from a water-only fast?
Water fasting drops insulin further, but the third and fourth day get brutal — energy crashes, sleep gets weird, and lean-mass loss accelerates. A small amount of protein and omega-3 from sardines preserves most of the metabolic signal while keeping the experience workable enough to repeat monthly.
Will I lose muscle on a 3-day fast?
A 3-day window with adequate protein from sardines (40–60g/day) does not meaningfully threaten lean mass in a healthy adult. We track the protein-sparing modified fast literature, including Vincent Stanko's original studies, in the research library.
What about mercury and heavy metals in sardines?
Sardines are small, short-lived, and low on the food chain. Mercury concentrations are an order of magnitude lower than in tuna or swordfish. We track the FDA and EFSA monitoring data and link to brand-specific testing where it exists.
Can I do this if I take medication?
It depends on the medication. Insulin, sulfonylureas, blood pressure meds, warfarin, lithium, and several others have known interactions with fasting or with sardines themselves. The full list of hard exclusions, soft exclusions, and “when to stop” symptom triggers lives on the Safety page. When in doubt, talk to the clinician who knows your case.
Do I need supplements?
A salt-magnesium-potassium electrolyte stack is the only addition almost everyone benefits from. Detailed dosing and brand-by-brand notes live in the paid Inner Circle, where we can be specific without giving generalised health advice. The free guide includes the basics.