Recruiting

Testing a Smart App to Help Prevent Weight Gain

Plain-English translation of NCT07120802 on ClinicalTrials.gov ↗ · Source last updated August 2025 · Translation generated June 2026 · How we translate trials

This study doesn't follow the usual testing phases — it may be an observational study or a different type of research.

What is this trial?

The BETTER4All study is testing a new smartphone app and smartwatch system designed to automatically track your daily habits—like how much you move, sleep, and eat—using artificial intelligence to give you personalized support. The system is being tested with about 490 adults across seven European countries to see if it's easy to use, actually works, and helps people stay healthy.

Many people struggle with weight gain, and current tools don't always provide the right help at the right time. This research aims to create a smarter, more personalized system that learns your habits and can offer timely, tailored support to prevent weight problems.

Do you qualify?

You likely qualify if…

you are between 18 and 65 years old
you have a normal weight, are overweight, or have obesity
you own an Android smartphone and are willing to use it for the study
you are able to read and understand the language in which the app is available in your country
you can commit to using the app and smartwatch for the full 21 days of the study
you live in one of the seven participating countries: Cyprus, France, Greece, Poland, Portugal, Spain, or Sweden

You likely don't qualify if…

you are pregnant or breastfeeding
you have a physical or mental health condition that would prevent you from using the smartwatch or app
you regularly eat with chopsticks as your main eating utensil
you do not have a compatible Android smartphone or cannot wear the smartwatch for technical reasons

What participation looks like

If you join, you'll wear a smartwatch and use a smartphone app for 21 days. The smartwatch automatically tracks your movement, heart rate, sleep, and location, while the app may ask you to answer some quick questions about your health and habits. You won't need to visit a clinic—everything happens on your phone and wearable device at home.

AI-generated summary from trial data · Jun 13, 2026 · Not medical advice

Trial locations(7 sites)

Cyprus

University of Cyprus (Ucy), Nicosia

France

Universite Lyon 1 Claude Bernard (Ucbl), Villeurbanne

Greece

Harokopio University, Athens, Aticca

Poland

Uniwersytet Swps (Swps), Wroclaw

Portugal

Centro de Estudos E Investigacao Em Dinamicas Sociais E Saude Associacao Sem Fins Lucrativos (Ceidss), Lisbon

Key details

Sponsor

Harokopio University

Collaborators

University of Navarra, University of Cyprus

Enrollment target

~490 participants

Started

June 2025

Primary completion

September 2025

This trial's estimated completion date has passed — the record may not be fully up to date.

Age range

18 Years – 65 Years

Last updated on clinicaltrials.gov in August 2025.

Contact the research team directly

Reach out to the team running this trial. Response times vary — some teams are faster than others.

Central contact

Yannis Manios, Professor

Department of Nutrition and Dietetics, School of Health Science & Education, Harokopio University, Athens, Greece

Interested in joining?

Tell us you're interested and we'll help connect you with the research team. We'll walk you through what to expect first — no email needed to get started.

View full record on ClinicalTrials.gov