What is Body Unpacked?
Body Unpacked is an iPhone health atlas that shows how a food's nutrients connect to real jobs in real places in your body, with a source on every step. Choose one of 44 everyday foods and a graph draws itself: food, then nutrients, then each nutrient's established roles, then the body places where they happen.
The mini tracer above works the same way, on a tiny scale. It uses four foods and three nutrients, with facts taken from the NIH iron fact sheet (2023), the NIH calcium fact sheet (2023) and the NIH vitamin B12 fact sheet (2024).
Foods contain nutrients, nutrients have jobs, and jobs happen somewhere you can point to.
A tour of the health atlas, screen by screen
What you can explore in the body explainer
| Nutrient Journeys | 14 nutrients on an animated body map: absorbed, carried, stored, used, removed. |
|---|---|
| Assemble the Body | Place one organ at a time where it really sits, with hints. |
| Connected Atlas | 249 sourced topics, including all 13 vitamins, in Simple, Standard or Deep dive. |
| Label reader | Photograph an ingredient list and it is read on your device. |
| Workspace | Save paths, comparisons and claims, and write your own notes. |
One decision we made: no "healthier" badges
It would have been easy to grade foods with a green tick. We left it out. A score hides the question that matters, which is "healthier for whom, compared with what?" So the compare screen shows only what each food contains, and missing data stays visibly missing instead of turning into a zero.
Honest limits
- Education only. It does not diagnose, treat or replace a qualified professional.
- Content is checked by the developer against cited sources, not independently reviewed by a clinician.
- Illustrations are simplified artwork made with AI-assisted tools.
Pick something else if you need personal diet advice or a calorie tracker. A registered dietitian, or a logging app, will serve you better.
This is general information, not medical advice. Talk to your clinician.
Questions about Body Unpacked
What is a good app to learn how the human body works?
If you learn best by following one thing from start to finish, Body Unpacked traces a food to its nutrients, their established roles and the body places where those roles happen. It also has step-through models of digestion, breathing and circulation, and the knee-jerk reflex. For full 3D anatomy for medical study, a dedicated anatomy atlas will go deeper.
Where does Body Unpacked get its numbers?
Food values come from USDA FoodData Central (SR Legacy), and each %DV shows its amount basis and the FDA reference it uses. Every claim in the app names its source, and missing data is shown as missing, never as zero.
Does it tell me what supplements to take?
No. It gives general educational information only, with no individual supplement or medication advice. Content is checked by the developer against cited public sources and has not been independently reviewed by a clinician.
Is Body Unpacked free?
It is free to download. The App Store listing does not describe a subscription; any in-app purchases would be shown on the App Store page before you buy anything.
Does it work offline?
Yes. All learning content is bundled with the app. There is no account, no ads, no analytics and no cloud AI, and your saved notes stay on your device.
Who is it for?
Curious adults, students, and anyone who has read a nutrition headline and wanted to see the evidence behind it. The 249 atlas topics switch between Simple, Standard and Deep dive.
Follow a food into your body
Pick spinach. Tap iron. See where it goes.
Updated November 2026
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