Your iPhone knows a lot about your health, especially if you use apps like MyFitnessPal or track your activities with your Apple Watch. If permission is given, applications can access this data. Here’s how to check which apps have access to your data.

We’ve shown how it can track your location and provide that data to apps before, but what about your health data? The Health app collects as much data as you can provide, and if you use apps to track your weight, calories, blood pressure, and more, that can be a lot. If you’re wearing an Apple Watch, it may contain even more information than you might think.

How to control which apps can access your health data

There may be some health data that you don’t want to track at all, or there may be others that you don’t mind Apple but prefer not to share with apps. These are all things you can control from the Health app.

To get started, open the Health app on your iPhone and tap Sources at the bottom of the screen.

Open Health and click Sources

Here you can see all apps that have requested access to your health data, either to read existing health data or to add new health data. By clicking on an individual application, you will get more information about the data to which it has access.

You can even see the data that remote apps have accessed by tapping «Remote Apps».

Click on the application you want to work on

There’s a handy button at the top of the screen that removes all access, but if you want more granular control, it’s possible with a series of toggles. There’s also a brief explanation of why the app needs access so your memory might be running out if it’s an old app that you may have forgotten about.

To turn off the app’s access to all types of health data, tap Turn off all categories. If you just want to turn off certain categories, move the appropriate switch to the Off position.

Disable access or click

Repeat this process for each app shown here to configure which app has access to which health data.

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