Published on in Vol 8 (2024)
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/48185, first published
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![Effectiveness of a Smartphone App (Heia Meg) in Improving Decisions About Nutrition and Physical Activity: Prospective Longitudinal Study Effectiveness of a Smartphone App (Heia Meg) in Improving Decisions About Nutrition and Physical Activity: Prospective Longitudinal Study](https://asset.jmir.pub/assets/3274be4dc9224be1b4ce2deccf00ca09.png 480w,https://asset.jmir.pub/assets/3274be4dc9224be1b4ce2deccf00ca09.png 960w,https://asset.jmir.pub/assets/3274be4dc9224be1b4ce2deccf00ca09.png 1920w,https://asset.jmir.pub/assets/3274be4dc9224be1b4ce2deccf00ca09.png 2500w)
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