Going Deeper Into HFA’s Ground-breaking GLP-1 White Paper

Kristy Piccinini, Ph.D., co-author of the report, explains why the research has shifted the conversation around GLP-1 treatment by providing evidence that can influence global health policy.


BY JIM SCHMALTZ

Since it was released on June 14, HFA’s white paper From Weight Loss to Lasting Value: Structured Exercise and the Economics of GLP-1 Therapy has shifted the debate on GLP-1 treatments and physical activity. Commissioned by HFA and produced by FTI Consulting’s Center for Healthcare Economics and Policy, the paper uses a five-country economic model that projects what happens when structured exercise is integrated into GLP-1 treatments.

Kristy Piccinini, director of FTI Consulting’s Center for Healthcare Economics and Policy, led the research team behind the GLP-1 white paper. She holds a Ph.D. in economics from UC Berkeley and an undergraduate degree in economics from Harvard.

With more than 20 years of experience in health economics research, public policy, and simulation modeling, Piccinini has advised federal agencies on everything from Affordable Care Act insurance exchanges to Medicare payment reform. Her explanation of what the study actually does—and why it matters—offers the clearest window into how the research is reshaping the conversation around treating the global health crisis of obesity.

Piccinini

Filling the Evidence Gap

The starting point, Piccinini explains, was a gap in existing research. Clinical studies had established that GLP-1s produce meaningful weight loss, and emerging evidence had shown that adding exercise to GLP-1 therapy could help preserve lean muscle mass and improve weight maintenance after patients stop the medication. But no one had translated those short-term clinical results into more detailed health outcomes and long-term economic value.

“As most of us are aware, GLP-1 therapies are proven to reduce weight, and there is a fair amount of evidence in the short term related to how structured exercise can be a part of that,” Piccinini says. “But what this research is looking at is trying to understand the long-term impact of combining structured exercise with GLP-1 therapies. And that’s where the strategies and techniques of health economics outcomes modeling really come in—to help us think about the long-term impacts, and not just what we know from pure clinical research.”

That distinction is critical. Clinical trials are designed to measure what happens during a study under controlled conditions over a defined and usually limited time. Health economic modeling does something different: It takes the available clinical evidence and uses simulation to extrapolate what those findings mean for patients, payers, and societies over years and decades. It also applies a monetary value to health gains, accounts for the downstream costs of obesity-related complications, and produces the kind of numbers—ROI percentages, national net monetary benefit figures—that dominate discussions in policy circles.

The FTI model tracked patients through BMI levels, cardiovascular health, diabetes status, joint replacement procedures, and mortality across a 30-year horizon in five countries: the United States, Australia, Canada, New Zealand, and the United Kingdom. The cost of the structured exercise intervention was modeled as a standard gym membership—a practical and accessible benchmark that kept the analysis grounded in the real world.

What Patients Should Know

When asked what the research means for individuals currently on GLP-1s or considering them, Piccinini’s answer is direct and practical—and it reflects a deeper message embedded in the model.

“What you can learn as a person considering taking GLP-1s, or on them already, is that structured exercise is really a way to cement the gains in your health that you can get from being on a GLP-1,” she says. “It can help you maintain weight loss if you need to stop taking it for any particular reason.”

One of the most well-documented limitations of GLP-1 therapy is what happens when patients stop: Clinical evidence shows that, within the first year after discontinuation, patients regain an average of roughly 67% of the weight they lost. Real-world data also shows that most patients who discontinue GLP-1s do so within the first two years of treatment. The combination creates a significant sustainability problem that the drug alone cannot solve.

Structured exercise, the model suggests, materially changes that trajectory. By helping patients to sustain lower BMI levels longer and to preserve the lean muscle mass that GLP-1s can reduce, structured exercise extends the health benefits of treatment past the point where the medication stops.

Piccinini is careful to note what the model does not fully capture—and why that matters for understanding the scope of what exercise can do.

“Although we don’t necessarily incorporate this yet, [structured exercise] can also help with preventing lean muscle mass loss and improving health in general,” she says. “One of the things that this research is doing—because it’s specifically comparing structured exercise as a treatment with GLP-1s—is it doesn’t get into all the other health benefits that exercise has for people. Of course, there’s lots of research about that. Since we’re doing a specific comparison, we don’t put that in there as well.”

The implication is significant: The white paper’s findings are conservative. The model was designed to estimate the incremental value of adding structured exercise to GLP-1 therapy, compared to GLP-1 therapy alone. The broader and well-established benefits of exercise—for cardiovascular health, mental health, bone density, independence in aging, and so on—were intentionally excluded to avoid estimates beyond the core question. The numbers the study produced, already substantial, thus represent a floor, not a ceiling.


“The big takeaways are that on an individual patient level, there are significant benefits in terms of adverse outcomes that are prevented.”
• Kristy Piccinini, Ph.D.


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The Investment Frame

If there is a single phrase from Piccinini’s analysis that captures the white paper’s policy argument most economically, it is this: Structured exercise is an investment in health.

“The key message is that what our modeling shows is that incorporating structured exercise—and paying for structured exercise—has a positive return on investment,” she says. “It is an investment in health. It’s an investment in long-term better health outcomes that actually reaps a reward. We are finding that there is positive return on investment for the resources you put into funding structured exercise.”

The numbers behind that argument are hard to dismiss. In the United States, the model found that pairing structured exercise with GLP-1 therapy produced a 496% return on investment (ROI) over 10 years—meaning every dollar spent on a gym membership generated approximately five dollars in total societal value. Over 30 years, that figure reaches 1,572%. National net monetary benefit in the US alone was estimated at $120 billion over 10 years and $393 billion over 30.

Critically, those returns held across every country studied and across healthcare systems structured in fundamentally different ways. That consistency is not incidental; it is one of the research findings Piccinini finds most meaningful.

“I think the big takeaways are that on an individual patient level, there are significant benefits in terms of adverse outcomes that are prevented,” she says. “From a payer perspective, there are a lot of benefits in not having to have medical costs associated with those adverse outcomes.”

For instance, the research showed that adding structured exercise to GLP-1 therapy meaningfully reduced cardiovascular events and joint replacements. This led to a combined medical and societal cost savings over 10 years that reached roughly $28 billion in the US, A$143 million in Australia, CAD$2.1 billion in Canada, NZ$54 million in New Zealand, and £1 billion in the UK.

“It is reassuring that we found such positive results across all the countries that we studied—because that indicates that these clinical pathways that we’re modeling really will generate savings no matter how healthcare is organized or delivered across different countries.”

A Credibility Shift for the Fitness Sector

The research arrives at a moment when the fitness industry is actively working to reposition itself within the healthcare conversation—not as a wellness amenity but as a measurable contributor to preventive health and healthcare savings. The GLP-1 white paper provides something that public health messaging about exercise has rarely delivered: a specific, quantified economic argument tied to one of the most consequential healthcare developments of the decade.

Piccinini frames the study’s contribution this way: It takes the existing clinical research and applies the tools of health economics to assign value to what that evidence suggests. In doing so, it gives policymakers, payers, and employers a way to evaluate structured exercise using the same economic framework they apply to pharmaceutical interventions.

“I think that what our research really supports is the idea that GLP-1s with structured exercise is a really effective way to reduce the incidence of obesity and reduce the costs associated with that over time,” she says. “The value of our contribution is in taking the existing clinical research that’s out there and using our economist tools to think about how to put value on that as a way to understand what the gain [and] benefit from these treatments [are].”

For policymakers, the message offers clear policy recommendations:

• reimbursement for structured exercise programs;

• tax-preferred treatment of fitness expenses; and

• referral pathways that connect patients receiving GLP-1 prescriptions to qualified exercise professionals and fitness facilities.

These are not aspirational requests—they are proposals grounded in an ROI framework that healthcare economists, insurers, and government agencies are already equipped to evaluate.

The GLP-1 era has spent its first several years asking whether or how patients can access the drug. The research that HFA and Piccinini and her team produced suggests the next question is already overdue: Once they have it, what does the system do to make the results—and societal benefits—last?

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