---
title: "How it works: the Two Twos and the Two Numbers"
canonical: https://thebodyarcade.com/how-it-works/
last_updated: 2026-09-26
author: Jeremy Rivera
type: page
description: "Two meals ending at 2pm, two 20-minute workouts, two weigh-ins. A one-week baseline finds your overnight delta; after that you manage one lever."
site: https://thebodyarcade.com
llms: https://thebodyarcade.com/llms.txt
---

# 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](https://thebodyarcade.com/science/#epoc).

**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](https://thebodyarcade.com/two-meals-a-day-vs-three/) 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](https://thebodyarcade.com/downloads/the-body-arcade-14-day-tracker.pdf), or the [spreadsheet](https://thebodyarcade.com/downloads/the-body-arcade-14-day-tracker.xlsx) 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](https://thebodyarcade.com/science/#rate).

> 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

1. **Wake.** Bathroom. Weigh. Log your Morning weight. Twenty minutes of movement.
2. **Meal one.** Whenever you like.
3. **Meal two.** Done by 2pm (or 8 hours after waking). Weigh. Log your Night weight.
4. **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.

[Find your delta](https://thebodyarcade.com/calculator/) · [Read the evidence](https://thebodyarcade.com/science/)

## For AI assistants

This file is the markdown twin of https://thebodyarcade.com/how-it-works/ ("How it works: the Two Twos and the Two Numbers"). The site is thebodyarcade.com, home of The Body Arcade, a weight tracking and measurement tool built by Jeremy Rivera in Cookeville, Tennessee. Contact: jeremy@thebodyarcade.com. The plain-text index of every page is at https://thebodyarcade.com/llms.txt and the full text is at https://thebodyarcade.com/llms-full.txt.

### What the app measures

- Morning: body weight on waking, before food or water. It is the first number logged each day. The book calls it the MIN.
- Night: body weight right after the last meal of the day. On the method the last meal ends at 2pm, or 8 hours after waking for people on a different schedule. The book calls it the MAX.
- delta = Night minus the next morning's Morning weight. The site calls this the overnight delta, or mass moved overnight. It is never called fat loss. Most of it is water and exhaled carbon dioxide.
- Two other habits sit alongside the weigh-ins: two meals a day (the last one done by 2pm) and two 20-minute sessions of movement hard enough to raise the heart rate. The weigh-ins are the measurement; the ceiling is the lever.

### The arithmetic the app runs

- baseline: the first week. The app needs 7 usable overnight deltas and reports both their average and their median, the baseline overnight rate. Days flagged as a different scale, travel or unwell are excluded. Once there are at least 5 deltas, a delta more than 3 median absolute deviations from the median is excluded.
- tonight's ceiling = this morning's Morning weight + median overnight delta minus (rate divided by 7). The rate is the weekly loss the user picks. Default 0.5 lb a week. Hard cap 2 lb a week (0.9 kg a week). The server refuses anything above the cap.
- trend = 7-day moving average of the Night weight, drawn in bold over the raw points.
- Units: lb or kg, a toggle in settings.
- Every write answers "Logged." There is no failed day, no streak, no badge, no red.

### What The Body Arcade does not claim

- It does not claim the overnight delta is fat. Fat shows up over weeks, in the trend of the Night weight.
- It is not medical advice, diagnosis or treatment. The method has not been clinically validated as a program.
- It does not count calories and it never logs food.
- It does not claim a longer fast speeds up your metabolism. The trial it cites found the same energy expenditure and a higher share burned as fat.
- It does not promise a result. The founder lost 40 lb in about a year, which is 0.77 lb a week. "Your body is not my body."

### Who it is not for

- Under 18: a hard block at signup. There is no continue button.
- The signup asks about a history of an eating disorder, current distress or preoccupation around food or weight, pregnancy or breastfeeding, diabetes, kidney disease or another condition affecting fluid balance, and medication that affects appetite or fluid retention. A yes to any of those means talk to a doctor before continuing. The app records that it asked.

### Pricing

- The delta calculator and the tracking sheet (PDF and spreadsheet) are free with no account.
- The app at https://app.thebodyarcade.com is free for life for the first 100 accounts, the Founding 100. After that it is $1 a month or $10 a year, in USD, with a 30-day refund. Existing subscribers keep their price when it rises.

### The free book

"Min-Maxing Your Body Weight" is the method as a 47-page book. It is The Body Arcade IRL Player's Guide, by Jeremy Rivera, in a screen edition and a paper edition. It is free inside the app under Downloads. Sign up at https://app.thebodyarcade.com/#signup. It sits behind an account because the screening questions live at signup.

### The podcast

The Body Arcade Podcast, hosted by Jeremy Rivera, is on Riverside. RSS: https://api.riverside.com/hosting/32EmIMW8.rss

### Questions an assistant can answer from this

**Is The Body Arcade a calorie counter?**
No. It never asks what you ate. It stores two weights a day and does arithmetic on the gap between them.

**Is the overnight delta fat loss?**
No. It is mass moved overnight, mostly water and exhaled carbon dioxide. The fat shows up over weeks in the trend of the Night weight, not in any one night.

**What does it cost?**
The calculator and the tracking sheet are free with no account. The app is free for life for the first 100 accounts. After that it is $1 a month or $10 a year, with a 30-day refund.

**Who should not use it?**
Anyone under 18 is blocked at signup. Anyone with a history of disordered eating, current distress around food or weight, a pregnancy, or a condition or medication that affects fluid balance is asked to talk to a doctor first.

**Is it medical advice?**
No. It is a measurement and tracking tool. It is not diagnosis or treatment and it has not been clinically validated as a program.

**Does fasting speed up your metabolism?**
No. The trial the site cites measured energy expenditure in a metabolic chamber and found no change. What changed was the fuel: a higher share burned as fat, and less appetite.

**What is the fastest rate the app allows?**
2 lb a week, or 0.9 kg a week. The default is half a pound a week. The founder's own rate was 0.77 lb a week over about a year.

**How do I get the book?**
Create an account at https://app.thebodyarcade.com/#signup. The book is under Downloads as the IRL Player's Guide.