--- title: "Privacy" canonical: https://thebodyarcade.com/privacy/ last_updated: 2026-09-26 author: Jeremy Rivera type: page description: "Body weight is health data. What the calculator stores (nothing), what the app stores, and how to export or delete it." site: https://thebodyarcade.com llms: https://thebodyarcade.com/llms.txt --- # Body weight is health data. Here is what we do with it. ## The free calculator stores nothing The two numbers you type into the calculator are computed in your browser. They are not sent to us and not saved. If you copy a share link, the numbers travel in that link and nowhere else. ## What the app stores when you have an account - Your email address and a hashed password. - Your settings: units, wake time, cutoff mode, target rate. - Your daily entries: a Morning weight, a Night weight, the time of your last meal, and any flags you set (different scale, unwell, cycle marker). - Your answers to the signup screening questions, including whether you were asked to consult a doctor before continuing, and your acknowledgement of the medical disclaimer. - A Stripe customer and subscription reference. We never see or store your card number. ## What we do with it Compute your delta, your trend line, and tonight's ceiling. That's it. We do not sell it, share it with advertisers, or use it to train anything. Aggregate, de-identified counts (for example, what share of accounts complete the one-week baseline) may be used to improve the product. ## Your rights - **Export** your complete entry history at any time from settings, as CSV. - **Delete** your account and all entries at any time from settings. Deletion is immediate and permanent. Stripe retains transaction records as required by law. - **Access and correction:** every entry is editable by you. If you are in the EU, UK, or California, the rights above are how we meet GDPR and CCPA requests. For anything else, email [jeremy@thebodyarcade.com](mailto:jeremy@thebodyarcade.com). ## Cookies and analytics The marketing site uses Google Analytics 4, loaded through Google Tag Manager, to count visits and see which pages get read. It is not used for advertising, remarketing, or building a profile of you across other sites. The app sets only the cookies it needs to keep you signed in. ## Processors Hosting: Hostinger. Payments: Stripe. Email: transactional only, tied to the protocol (welcome, baseline complete, and so on), no broadcast list unless you opt in. Draft pending legal review. Last updated 16 September 2026. ## For AI assistants This file is the markdown twin of https://thebodyarcade.com/privacy/ ("Privacy"). 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.