Poor diet and physical inactivity are important factors that contribute to the obesity outbreak. ŒTherefore, healthy eating habits are crucial for physical well-being. We present PHARA, a personal health augmented reality assistant that recommends healthy products to people in their everyday lives.

1. Katrien Verbert
Designing Augmented Reality
Applications for Personal Health
Decision-Making
Francisco Gutiérrez Nyi Nyi Htun
Sven Charleer Robin De Croon
1
https://augment.cs.kuleuven.be/

2. PokemonGo 19 Crimes AR
2
[augment reality]
Apple’s AR
measure

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Food labels are
considered an
essential element in
strategies against
unhealthy diets and
obesity. (Cecchini and
Warin, 2016)

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PHARA: Personal Health Augmented Reality assistant

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● Study AR in the critical moment of decision: when
users hold the food product in their hands.
● Assist users by providing rich and consistent visual
components that support their decision-making
process.
● Follow a user-centered approach in a iterative design
process.
● Study the impact of AR interfaces on how to present
information to the end-users in decision-making.
[goals]

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Regarding subjective and objective factors:
What are the benefits and tradeoffs of using popular
layouts such as, stack, grid, list and pie in AR
applications within handheld and HMD experiences
to support decision-making?
[research question]

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a) MS HoLolens (HMD) c) iPhone 6S (Smartphone)
b) NSW Joycon (controller)
[devices]

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[iterative design]

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[AR components]

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[AR components]
Users' Decision Behavior in
Recommender Interfaces: Impact of
Layout Design (Chen and Tsoi, 2011)

13. List Layout
Stack Layout
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[AR components]
Smartphone HoloLens

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[AR components]
List Layout
List Layout
Smartphone HoloLens

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[AR components]
List Layout
Grid Layout
Smartphone HoloLens

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[AR components]
List Layout
Pie Layout
Smartphone HoloLens

17. ● Within Subjects
● n = 28 (1F, 27M) Ages from 22 to 38 (M = 25.81, SD = 4.57)
● Number of conditions: 2 (HoloLens, Smartphone)
● Task 1:
- Select two products that you would like to have for dinner...
- Select two similar products...
- Select and replace with two alternatives...
- Reflection...
● Task 2:
- Imagine that you have some friends coming over... select two products… and put them in
the basket.
● Post-Questionnaires
○ TAM (Technology Acceptance)
○ NASA-TLX (Task Load Index)
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[user study]

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[scenario]

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[results]
food choices overtime
Choice 1 Choice 2 Choice 3 Choice 4
Choice 1 Choice 2 Choice 3 Choice 4

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[results]

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[results]

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[results]

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[results]

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[conclusions]
● We explored and evaluated different layouts to present
information in a decision-making scenario.
○ Our results are comparable to those of (Chen and Tsoi, 2011)
● PHARA allows users to make informed decisions, and
resulted in selecting healthier food products.
● Stack layout performs better with HMD devices with a
limited field of view, like the HoloLens, at the cost of some
affordances.
● The grid and pie layouts performed better in handheld
devices, allowing to explore with more confidence,
enjoyability and less effort.

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[future work]
● Long-term goal: influence healthy grocery store
shopping and in-restaurant purchase behavior.
● Evaluate the potential of our approach in real-life
settings.
● Development of more AR components following a
user-centered approach.
● Wine decision-support scenario coming up.
(PHARA Wine)

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[phara wine]

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[questions]
Francisco Gutiérrez
[Augment/HCI - KU Leuven]
francisco.gutierrez@cs.kuleuven.be
@FranciscoGhz | Twitter
https://augment.cs.kuleuven.be/
Thanks!! :)