Published on in Vol 7, No 5 (2019): May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9232, first published
.
![A Focused Review of Smartphone Diet-Tracking Apps: Usability, Functionality, Coherence With Behavior Change Theory, and Comparative Validity of Nutrient Intake and Energy Estimates A Focused Review of Smartphone Diet-Tracking Apps: Usability, Functionality, Coherence With Behavior Change Theory, and Comparative Validity of Nutrient Intake and Energy Estimates](https://asset.jmir.pub/assets/7c877643207176f57300fbc012351f95.png 480w,https://asset.jmir.pub/assets/7c877643207176f57300fbc012351f95.png 960w,https://asset.jmir.pub/assets/7c877643207176f57300fbc012351f95.png 1920w,https://asset.jmir.pub/assets/7c877643207176f57300fbc012351f95.png 2500w)
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