Study protocol for a randomized clinical trial evaluating the effectiveness of a Brazilian lifestyle-based diabetes prevention program: the PROVEN-DIA trial
The PROVEN-DIA trial is a multicenter, randomized controlled superiority study designed to evaluate the effectiveness of a structured 36-month Brazilian lifestyle-based diabetes prevention program delivered via hybrid or telehealth formats compared to standard unstructured care in preventing type 2 diabetes among 1,305 adults with prediabetes.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of a preprint that has not been peer-reviewed. It is not medical advice. Do not make health decisions based on this content. Read full disclaimer
Imagine Brazil as a giant, bustling city where a sneaky thief called Type 2 Diabetes is trying to break into the homes of millions of people. Right now, this thief has already knocked on the doors of over 16 million Brazilians, and the number is growing fast. But before the thief breaks in, there's a "warning period" called prediabetes, where the house is unlocked but the thief hasn't entered yet. This is the perfect time to install a security system!
For a long time, scientists in other countries have built amazing security systems (lifestyle programs) that can stop the thief. But Brazil is huge, with different neighborhoods, cultures, and distances that make copying those foreign systems tricky. Plus, nobody knew if a security system delivered entirely by video call (telehealth) could work just as well as one where you meet a guard in person.
That's where the PROVEN-DIA trial comes in. Think of this study as a massive, 36-month experiment to test two different ways of installing a "Lifestyle Security System" for 1,305 adults who are currently in that "prediabetes" warning zone.
The Three Teams
The researchers split the participants into three teams to see which strategy works best:
- The Hybrid Team (PROVEN-DIA): These folks get the full treatment. They meet a "Lifestyle Counselor" in person for deep talks, but they also get remote check-ins from a "Lifestyle Coach" via video or phone. It's like having a personal trainer you meet at the gym, plus a coach who texts you daily to keep you on track.
- The Telehealth Team (TelePROVEN-DIA): This group gets the exact same advice, goals, and support, but it happens 100% online. No in-person meetings, just video calls and digital check-ins.
- The "Usual Care" Team: This group is the control group. They get the standard, basic advice you might get at a regular doctor's visit—general tips on eating and moving—but without the structured plan, the frequent check-ins, or the specific goal-setting tools. It's like getting a pamphlet instead of a personal coach.
The Mission
The main goal is to see if the Hybrid or Telehealth teams can stop the "Diabetes Thief" from breaking in over the next 36 months. The researchers are measuring if these structured programs can keep people from developing Type 2 diabetes.
They aren't just looking at blood sugar, though. They are also tracking how much weight people lose, how well they sleep, how stressed they feel, and how much they move. It's a full-body check-up of the "security system."
The Rules of the Game
- The Target: The study is looking for a specific result: preventing the cumulative incidence of Type 2 diabetes. This means they are counting how many people in each group actually get the disease by the end of the 36 months.
- The Numbers: They started with a plan to recruit 1,305 people. By June 2026, they had already enrolled 944 of them. They expect to finish recruiting by late 2026, and the final results won't be ready until around 2030 because they need to wait for the full 3 years to pass.
- The "No-Go" Zone: The study explicitly rules out people who already have diabetes, are pregnant, or are taking certain medications that mess with blood sugar. They also made sure to exclude anyone who had already been in a similar strict diet or exercise program recently, so the results are clean.
- The "Maybe" Zone: The paper suggests that structured programs work (based on past studies in other countries), but it does not claim to know yet which of the two Brazilian methods (Hybrid vs. Telehealth) is the winner. That is exactly what this trial is trying to find out. It is a test, not a finished report.
Why This Matters
The researchers are trying to solve a puzzle: Can a digital-only security system work just as well as a mix of in-person and digital? If the Telehealth team does just as well as the Hybrid team, it could be a game-changer for remote areas in Brazil where driving to a clinic is impossible.
However, the paper is very clear: We don't know the answer yet. This is a protocol—a plan for the experiment. The results are still in the future. The study is designed to be fair, using strict rules and random selection, but until the 36 months are up and the data is analyzed, the "Diabetes Thief" is still out there, and the best defense remains a mystery waiting to be solved.
The study is currently running, and by December 2029, they hope to have all the data needed to tell us which security system is the real champion for Brazil. Until then, it's all about watching, waiting, and collecting the clues.
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