This app allows you to save food items the consumption of which can then be tracked in AppleHealth.
You can either add your own items, or import them by EAN using data from Open Food Facts.
Additionally to being able to track "current" consumption, you can also track a previous consumption by long-pressing the tracking button.
The App saves the tracking events only in Apple Health, the items that can be tracked are stored in the users iCloud app storage; an optional JSON import/export is also available.