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Why One Meal A Day Is Good For You | The Unknown Secret

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Twenty-two hours fasted, one hour to eat — and Dr. Nick Zyrowski says that’s the whole trick.

In “Why One Meal A Day Is Good For You | The Unknown Secret,” holistic health practitioner Dr. Nick Zyrowski walks through the mechanics behind OMAD, the intermittent fasting protocol that collapses a full day’s calories into a single one-to-two-hour window. He frames it not as a starvation stunt but as a deliberate metabolic reset — a way to force the body off glucose and onto stored fat, then let it clean house at the cellular level. Zyrowski’s version of the protocol is also less rigid than the internet caricature: he doesn’t do OMAD every day, and he explains exactly why.

• OMAD is defined by a 22-to-23-hour fasting window paired with a 1-to-2-hour eating window, an escalation beyond standard intermittent fasting schedules like 16:8.
• Zyrowski says extending the fast this long exhausts glycogen stores, pushing the body into ketosis and suppressing circulating insulin — a mechanism he ties to reversing insulin resistance and stabilizing cholesterol and hormone balance.
• Zyrowski practices OMAD only about two days a week, running 16:8 the rest of the time, arguing that periodic cycling captures the ketosis and autophagy benefits without the burnout or nutrient deficiencies of doing it daily.

The Mechanics of a 22-to-23-Hour Fast

Standard intermittent fasting protocols like 16:8 leave an 8-hour eating window; OMAD shrinks that down to 1 or 2 hours, stretching the fast itself to 22 or 23 hours. Zyrowski explains that this extended duration is what separates OMAD from ordinary time-restricted eating — it’s long enough to fully deplete liver and muscle glycogen, the body’s readily available carbohydrate fuel. Once glycogen runs dry, the body has no choice but to pull from adipose tissue for energy, which is the metabolic shift Zyrowski centers his entire pitch on.

Metabolic Switching and Insulin Suppression

Zyrowski’s core argument rests on what fasting researchers call metabolic flexibility — the body’s ability to toggle efficiently between burning glucose and burning fat. He says the long OMAD fasting window suppresses circulating insulin for a sustained stretch, and that lower insulin exposure over time is what allows insulin resistance to reverse. He connects this same insulin suppression to downstream improvements in cholesterol and hormone balance, positioning OMAD as less of a weight-loss gimmick and more of a metabolic maintenance tool.

Autophagy and Cellular Cleanup

Beyond fat-burning, Zyrowski points to autophagy — the process by which cells break down and clear out damaged components — as the deeper payoff of prolonged fasting. He argues this cellular housekeeping is what links extended fasts to longevity and anti-aging claims, since clearing out dysfunctional cellular material is thought to reduce the buildup associated with age-related decline. It’s the mechanism Zyrowski returns to repeatedly as the “unknown secret” in the video’s title.

Two days of OMAD, five days of 16:8 — that’s the whole protocol Zyrowski runs on himself.

Zyrowski’s Two-Day Protocol

Rather than pitching OMAD as a permanent daily rule, Zyrowski details his own routine: he practices true one-meal-a-day fasting roughly two days a week and relies on a standard 16:8 intermittent fasting split, similar to what’s covered in What I Eat In A Day, for the remaining five. His reasoning is that cycling in and out of deep ketosis lets him capture the autophagy and fat-adaptation benefits of extended fasting without the chronic stress, nutrient shortfalls, or burnout that can come from running OMAD every single day — a middle path closer in spirit to the structured fat-loss windows described in 30 Days of Alternate-Day Fasting than to a strict daily OMAD regimen.

Zyrowski’s pitch isn’t “do this forever” — it’s two days a week, then back to a normal eating window, which is exactly the kind of protocol a viewer could test on their own calendar starting this Monday without overhauling their entire diet.