How it works
Two twos, two numbers
Eat twice. Move twice. Weigh twice. Under a minute a day of actually doing anything, and nothing to count.
The Two Twos
What’s the rule here? There are two, and they’re both the number two.
Two meals a day
Your last meal ends at 2:00 pm. Nothing’s banned and nothing’s weighed. Water is free, and your own numbers will teach you how late in the day you can drink it before it shows up on the next morning’s reading.
Two workouts a day
20 minutes, twice, hard enough to get your heart rate up. Walk fast, cycle, lift, dance, whatever you’ll actually do. The intensity is the condition, not the activity: a stroll is good for you but it doesn’t produce the effect the research measured.
Not up at 6am? Work nights? Then the rule is really “last meal ends 8 hours after you wake.” A 2pm cutoff is just what that looks like for someone up at 6. Shift workers, night owls, parents of newborns: keep the ratio, not the clock. The evidence is for an early window in your day.
It’s not about perfection
Got a dinner planned? Then dinner is meal two. Drop the 2pm cutoff that day and keep the two-meal count instead: one meal earlier, the dinner, done. What you’re avoiding isn’t the dinner. It’s eating twice by 2pm and then going out for a third, big one on top. Just knowing which of those you’re doing does most of the work.
Log the late meal as late, weigh after it, and the next morning’s number will tell you what it cost. Usually less than you’d think, occasionally more. Either way it’s a reading, not a verdict. The people who make this work aren’t the ones who never miss the cutoff. They’re the ones who keep writing the numbers down when they do.
The Two Numbers
| Number | When | What it is |
|---|---|---|
| Morning | On waking, before breakfast or water. Always the first number of your day. | Your floor (your MIN, in the book) |
| Night | Right after your last meal (by 2pm) | Your ceiling for the day (your MAX, in the book) |
delta = Night − next Morning
Your delta is what leaves between your last meal and the next morning. Most of it is water: what you breathe out, what leaves through your skin, sixteen or so hours with nothing coming in. We don’t call it fat loss because it isn’t. What it actually is, measured over a week, is steady enough to plan against. That’s all it needs to be.
Days 1 to 7: just write down two numbers
Run the protocol and log both numbers. No targets, no adjustments, no goals. Your only job is do the thing and write it down. Here’s a free sheet to write it on, or the spreadsheet if you’d rather it did the arithmetic.
Why a week? Because your weight has a weekly rhythm. In 80 people logging 4,657 weigh-ins, the high came on Sunday or Monday and the low on Friday or Saturday, most weeks. Seven days hold every day of the week exactly once, so the weekend high and the Friday low both land in your baseline and neither one gets counted twice. And because the app plans from your median, one salty Sunday can’t drag the number around the way it drags an average.
After your first seven nights the app shows you your average overnight drop and your median. That’s your baseline overnight rate, and it’s the moment the number stops being random and starts being yours.
Day 8 onward: you manage one lever
From here you manage a single thing: tonight’s Night weight. The app sets that ceiling from this morning’s weight, your median overnight drop, and the rate of loss you picked, half a pound a week by default. You can change it. You can’t push it past 2, because that’s the top of the range the CDC calls safe.
tonight’s ceiling = this morning + your median overnight drop − (weekly rate ÷ 7)
You eat and drink until you’re near the ceiling, then you stop. You keep logging your Morning weight so the delta stays honest and the trend line keeps moving. That’s the whole discipline. You don’t count anything. You weigh, so you know.
What a day actually looks like
- Wake. Bathroom. Weigh. Log your Morning weight. Twenty minutes of movement.
- Meal one. Whenever you like.
- Meal two. Done by 2pm (or 8 hours after waking). Weigh. Log your Night weight.
- Later. Twenty minutes of movement. Then nothing but water until morning, and you’ll learn from your own numbers how late is too late for that.
There’s no such thing as a failed day
This is a design rule. Ate at 9pm because it was your anniversary? Log 9pm. Skipped a workout? Nothing happens. Blew past your ceiling? The number’s higher. The app says “Logged.” and that’s it.
No streaks, no chains, no badges for showing up, no red. Streak mechanics turn a measurement tool into a compliance tool, and compliance tools are exactly what make weight apps dangerous for the people who shouldn’t be using them. The data is observational. You’re not on trial.
Things that will happen, and what the app does about them
| Case | Handling |
|---|---|
| Missed a weigh-in | Leave the gap. The trend line skips it. |
| Travel, different scale | Flag the entry. It’s left out of your baseline. |
| Illness | Optional “unwell” flag, left out of the trend. |
| Menstrual cycle | Optional cycle marker so the trend can account for water retention. |
| Delta goes negative | It can (late fluid, salty dinner). A reading far outside your usual run drops out automatically, measured from your median so one typo can’t hide itself. |
| Plateau | Your delta changes as your mass changes. The app prompts a fresh 7-day recalibration every 4 to 6 weeks, or sooner if the observed delta drifts. |
Will your delta be 1.5, or 2.5, or 0.9? I actually can’t tell you. That’s why the first week exists.