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Cleveland Clinic Functional Medicine Outcomes Study Review

By Dr. Laura Bennett · Endocrinologist & Obesity Medicine Editor, The GLP-1 Daily

Updated May 2026

April 11, 2026 · 16 min read

Last updated: April 2026

Disclaimer: This article is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before starting any treatment.

Affiliate Disclosure: We may earn a commission when you purchase through our links. This does not affect our editorial independence.

Quick Answer

The Cleveland Clinic has conducted significant research into the effectiveness and delivery of functional medicine care, offering valuable insights into its patient outcomes and cost-efficiency. Their studies show that the functional medicine model is associated with improvements in health-related quality of life, particularly in global physical health. For example, in a two-year study, 31% of patients treated at the Center for Functional Medicine improved their PROMIS global physical health scores by 5 points or more at 6 months. This is considered a noticeable and clinically meaningful effect on daily life [https://newsroom.clevelandclinic.org/2019/10/25/cleveland-clinic-study-finds-functional-medicine-model-is-associated-with-improvements-in-health-related-quality-of-life]. Furthermore, when functional medicine care is delivered through shared medical appointments, patients experience even greater improvements in both physical and mental health, along with significant cost savings compared to traditional individual appointments. These findings suggest that functional medicine offers a promising approach to addressing chronic disease, focusing on root causes and delivering measurable benefits to patients.

What is Functional Medicine and How Does it Differ?

Functional medicine is an approach to healthcare that focuses on identifying and addressing the root causes of chronic disease, rather than just treating symptoms. It takes a personalized approach, considering each patient's unique genetic makeup, environment, and lifestyle factors. This model stands apart from conventional medicine by emphasizing prevention through diet, exercise, and stress management, and by utilizing a systems-oriented approach to understand the complex interactions in the body.

A Deeper Look at the Functional Medicine Model

The functional medicine model differs from conventional primary care in several key ways. While traditional medicine often focuses on acute care and managing symptoms with medication, functional medicine aims to uncover the underlying imbalances that lead to chronic conditions. This often involves detailed patient histories, advanced diagnostic testing, and comprehensive lifestyle interventions. We look at the body as an interconnected system, recognizing that issues in one area can impact others. This holistic perspective allows for more targeted and personalized treatment plans, which can include dietary changes, nutritional supplements, stress reduction techniques, and personalized exercise regimens. The goal is not just to alleviate discomfort but to restore optimal body function and promote long-term well-being.

Cleveland Clinic's Research on Functional Medicine

Cleveland Clinic's Center for Functional Medicine has been at the forefront of studying this model of care. In their initial two-year retrospective cohort study, researchers examined 1,595 patients treated at the Center for Functional Medicine. This group was compared to 5,657 patients who received care in a primary care setting at a family health center [https://newsroom.clevelandclinic.org/2019/10/25/cleveland-clinic-study-finds-functional-medicine-model-is-associated-with-improvements-in-health-related-quality-of-life]. The study aimed to understand the association between the functional medicine model of care and improvements in health-related quality of life. By comparing these two distinct patient groups, researchers could assess whether the functional medicine approach yielded different outcomes.

The demographics of the patient populations in the study revealed some interesting differences. Patients receiving functional medicine care at the Cleveland Clinic Center for Functional Medicine had a mean age of 49.4 years, while patients in the family health center had a mean age of 55.4 years [https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2753520]. This age difference suggests that patients seeking functional medicine might be slightly younger on average, potentially seeking proactive health solutions earlier in their lives. The functional medicine model is inherently personalized, meaning that recommendations for nutrition and lifestyle are tailored to the individual, a concept supported by research into personalized lifestyle medicine [https://pubmed.ncbi.nlm.nih.gov/23878520/]. This individualized approach is a hallmark of functional medicine, moving away from a one-size-fits-all model of care. The Cleveland Clinic study provides robust, real-world data on how this model translates into tangible patient benefits.

Does Functional Medicine Improve Health-Related Quality of Life?

Yes, functional medicine care has been associated with significant improvements in patients' health-related quality of life. Patients receiving care at the Cleveland Clinic's Center for Functional Medicine showed beneficial and sustainable improvements in their global physical health, as measured by a validated questionnaire. These improvements were particularly noticeable in the short term, demonstrating a measurable impact on daily life for a substantial portion of patients.

Measuring Health-Related Quality of Life

To assess health-related quality of life, the Cleveland Clinic researchers utilized PROMIS® (Patient-Reported Outcome Measurement Information System). PROMIS is a questionnaire validated by the National Institutes of Health (NIH) that measures various aspects of a patient's global physical and mental health over time [https://newsroom.clevelandclinic.org/2019/10/25/cleveland-clinic-study-finds-functional-medicine-model-is-associated-with-improvements-in-health-related-quality-of-life]. It covers important factors such as fatigue levels, physical function, the experience of pain, gastrointestinal issues, and overall emotional well-being. By using a standardized and validated tool like PROMIS, researchers could objectively compare outcomes between different care models. A change of 5 points or more on the PROMIS Global Health T-score scales is considered a clinically meaningful improvement, indicating a noticeable effect on a patient's daily life. This threshold helps distinguish between minor fluctuations and significant, impactful changes in health.

Outcomes in Global Physical Health

The study found that patients treated at the Center for Functional Medicine experienced significantly larger improvements in their PROMIS global physical health compared to those seen in a primary care setting at the 6-month mark. Specifically, approximately 31% of patients receiving functional medicine care improved their PROMIS global physical health scores by 5 points or more [https://newsroom.clevelandclinic.org/2019/10/25/cleveland-clinic-study-finds-functional-medicine-model-is-associated-with-improvements-in-health-related-quality-of-life]. In contrast, only 22% of primary care patients achieved similar improvements of 5 points or more in their scores during the same period. This difference highlights the potential effectiveness of the functional medicine approach in enhancing physical well-being.

When researchers looked at continuous changes over time in a smaller, matched group of patients, they found that functional medicine patients consistently showed greater improvements in PROMIS global physical health at both 6 and 12 months. These continuous improvements were significantly larger than those observed in patients receiving primary care [https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2753520]. While the initial significant difference at 6 months wasn't maintained at 12 months when comparing the full cohorts, the continuous change analysis for matched patients underscores a sustained positive trajectory for those in functional medicine. This suggests that the interventions and personalized care plans implemented in functional medicine can lead to lasting, positive changes in how patients experience their physical health. The focus on root causes, rather than just symptom management, likely plays a critical role in these sustained improvements.

Broader Impact on Quality of Life

Improvements in global physical health can have a cascading positive effect on a patient's overall quality of life. When physical pain decreases, energy levels increase, and physical function improves, individuals are better able to engage in daily activities, hobbies, and social interactions. This can lead to enhanced emotional well-being, reduced fatigue, and a greater sense of control over one's health. The functional medicine model, with its emphasis on diet, lifestyle, and addressing underlying imbalances, is designed to create these foundational changes that support a healthier, more vibrant life. The initial study, which was the first retrospective cohort study of the functional medicine model, confirmed that this approach is associated with improvements in health-related quality of life, according to Michelle Beidelschies, Ph.D. [https://newsroom.clevelandclinic.org/2019/10/25/cleveland-clinic-study-finds-functional-medicine-model-is-associated-with-improvements-in-health-related-quality-of-life]. This foundational research provides a strong basis for understanding the real-world benefits experienced by patients. For more details, see Cleveland Clinic Functional Medicine Study.

What Are Shared Medical Appointments in Functional Medicine?

Shared medical appointments (SMAs) are a unique way of delivering healthcare in a group setting. In functional medicine, SMAs allow multiple patients with similar chronic conditions to meet with a healthcare provider simultaneously, fostering a sense of community and shared learning. This model provides an alternative to traditional one-on-one appointments, aiming to make care more efficient and impactful.

The Structure of Shared Medical Appointments

Shared medical appointments at the Cleveland Clinic Center for Functional Medicine, such as their "Functioning For Life®" (FFL) program, are typically structured as a series of sessions over a set period. The FFL program, for instance, is a 10-week SMA designed to address various chronic conditions, with a strong emphasis on using food as medicine [https://newsroom.clevelandclinic.org/2021/04/13/cleveland-clinic-study-finds-functional-medicines-shared-medical-appointments-deliver-improved-patient-outcomes-at-less-cost]. During these sessions, patients receive education, engage in discussions, and participate in practical exercises related to their health. A healthcare provider leads the group, offering guidance and answering questions, while also facilitating peer support and interaction among patients. This format allows for extended time with the provider compared to typical individual appointments, and it also leverages the collective wisdom and experiences of the group.

The "Functioning For Life®" Program

The "Functioning For Life®" program is a prime example of how functional medicine is delivered through SMAs. It focuses on empowering patients to make positive decisions about their diet and lifestyle. The curriculum is designed to educate patients on the principles of functional medicine, including the impact of nutrition on chronic disease, stress management techniques, and the importance of physical activity. By the end of the program, patients are often better equipped to advocate for healthy lifestyles not only for themselves but also within their homes and communities. This community-based approach can be particularly powerful in fostering long-term adherence to healthy habits, as patients gain support and accountability from their peers. The program's design, emphasizing food as medicine, aligns with the core principles of functional medicine, which recognizes the profound impact of nutrition on overall health and disease prevention. This model offers a comprehensive and supportive environment for patients seeking to make significant and lasting health changes.

Patient Participation in SMAs

A study comparing SMAs to individual appointments included a total of 2,455 patients. Of these, 226 participated in in-person SMAs, while 2,229 received care through individual appointments between March 1, 2017, and December 31, 2019 [https://pubmed.ncbi.nlm.nih.gov/33849860/]. To ensure a fair comparison, researchers created 213 propensity score-matched pairs. This matching process carefully considered factors such as age, sex, race, marital status, income, weight, body mass index (BMI), blood pressure (BP), baseline PROMIS scores, and functional medicine diagnostic category. By matching patients with similar characteristics, the study could more accurately attribute differences in outcomes to the care delivery model (SMA vs. individual appointment) rather than pre-existing patient differences. This rigorous methodology strengthens the conclusions drawn about the effectiveness and efficiency of SMAs in delivering functional medicine-based care. The findings from this study suggest that the group dynamic inherent in SMAs may contribute to improved patient engagement and adherence, leading to better outcomes.

Are Shared Medical Appointments More Effective and Cost-Efficient?

Yes, research from the Cleveland Clinic demonstrates that shared medical appointments (SMAs) are both more effective in improving patient outcomes and less costly to deliver compared to individual appointments. This makes SMAs a highly promising model for expanding access to functional medicine care.

Enhanced Health Improvements in SMAs

Patients participating in shared medical appointments showed greater improvements in both their physical and mental health. At the 3-month mark, SMA patients exhibited a mean difference of 1.18 points greater improvement in PROMIS Global Physical Health T-scores compared to patients in individual appointments (p=0.03) [https://pubmed.ncbi.nlm.nih.gov/33849860/]. This statistically significant difference indicates a tangible benefit in how SMA patients experienced their physical well-being. Beyond physical health, SMAs also positively impacted mental health. Patients in SMAs showed a mean difference of 1.78 points greater improvement in PROMIS Global Mental Health T-scores at 3 months (p=0.002) compared to those in individual appointments [https://pubmed.ncbi.nlm.nih.gov/33849860/]. These findings suggest that the group setting, peer support, and extended educational components of SMAs contribute to a more comprehensive improvement in overall patient health. The collective encouragement and shared experiences within a group can provide a powerful motivator for behavioral change and adherence to treatment plans. This holistic improvement, encompassing both physical and mental well-being, underscores the strength of the SMA model in functional medicine.

Measurable Biometric Changes

Beyond patient-reported outcomes, SMAs also led to significant biometric improvements. Patients in shared medical appointments experienced greater weight loss compared to those in individual appointments, with a mean difference of -1.4 kg (p<0.001) [https://pubmed.ncbi.nlm.nih.gov/33849860/]. This finding is particularly important given the widespread prevalence of obesity and its associated health risks. The focus on "food as medicine" within programs like the "Functioning For Life®" SMA likely contributes to these positive changes in weight. Interestingly, both SMA patients and those in individual appointments experienced a 5.5 mm Hg improvement in systolic blood pressure. This suggests that the functional medicine approach, regardless of delivery method, has a beneficial impact on blood pressure regulation. The combination of improved patient-reported outcomes and objective biometric changes provides strong evidence for the effectiveness of functional medicine delivered through SMAs. These results support the idea that personalized lifestyle interventions, which are a core component of functional medicine, are crucial for prevention and treatment of obesity-related conditions [https://pubmed.ncbi.nlm.nih.gov/40282431/].

Cost-Efficiency of SMAs

In addition to being more effective, shared medical appointments were also found to be less costly to deliver than individual appointments. This is a crucial finding for healthcare systems looking to provide high-quality care efficiently. The ability to educate and treat multiple patients simultaneously allows healthcare providers to optimize their time and resources. This cost-effectiveness, coupled with improved patient outcomes, positions SMAs as a valuable model for expanding access to functional medicine. "SMAs deliver functional medicine-based care that improves outcomes more than care delivered in individual appointments and is less costly to deliver," said Michelle Beidelschies, Ph.D., a key researcher in these studies [https://newsroom.clevelandclinic.org/2021/04/13/cleveland-clinic-study-finds-functional-medicines-shared-medical-appointments-deliver-improved-patient-outcomes-at-less-cost]. This statement summarizes the dual benefit of SMAs: better health for patients and more sustainable care delivery for providers and institutions. The implications for healthcare policy and practice are significant, suggesting that integrating SMAs could be a strategic way to manage chronic conditions more effectively and affordably.

Who Seeks Functional Medicine Care?

Patients who seek functional medicine care often have distinct characteristics that differentiate them from those in traditional primary care settings. The Cleveland Clinic studies revealed specific demographic differences, offering insights into the patient population drawn to this root-cause approach. Understanding these differences can help functional medicine practitioners tailor their outreach and care delivery. For more details, see Functional Medicine Shared vs. Individual Appointments Study.

Demographic Profile of Functional Medicine Patients

The initial Cleveland Clinic study provided a detailed comparison of patient characteristics between the Center for Functional Medicine and a family health center. The data showed that patients seeking functional medicine were predominantly women. Specifically, 81.5% of functional medicine patients were women, compared to 61.5% of patients in family health centers, a statistically significant difference (P < .001) [https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2753520]. This suggests that women may be more inclined to explore alternative or complementary approaches to health, possibly due to their higher rates of certain chronic conditions or a greater interest in holistic care.

Another notable demographic difference was related to race. The study found that 92.4% of functional medicine patients were of White race, while 85.0% of family health center patients were White (P < .001) [https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2753520]. This racial disparity points to potential access issues or differing awareness levels within various communities regarding functional medicine. Addressing these disparities could be an important step in making functional medicine more equitable and accessible to a broader patient base. In terms of marital status, 69.0% of functional medicine patients were married, compared to 64.6% in family health centers (P = .002), another small but statistically significant difference. Income levels also varied, with functional medicine patients having a median household income of $59,286.0, which was lower than the $72,874.0 median for family health center patients (P < .001) [https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2753520]. This challenges some common perceptions about who can access or afford functional medicine, suggesting a diverse economic background among patients.

Health Conditions Among Patient Groups

The health profiles of functional medicine patients also stood out. They had a significantly lower incidence of certain chronic diseases compared to patients in family health centers. For instance, only 17.9% of functional medicine patients had diabetes, whereas 34.1% of family health center patients were diagnosed with diabetes (P < .001) [https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2753520]. Similarly, hypertension was present in 19.2% of functional medicine patients but in 50.9% of family health center patients (P < .001). These statistics indicate that functional medicine patients, on average, entered the care model with fewer severe chronic conditions like diabetes and high blood pressure. This could mean they are seeking care earlier in their disease progression, or they may have different health-seeking behaviors.

However, the prevalence of depression was similar between the two groups, with 25.8% of functional medicine patients and 24.1% of family health center patients reporting depression (P = .18) [https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2753520]. This suggests that mental health concerns are a common thread across different healthcare models and that functional medicine patients may be seeking help for these issues alongside physical complaints. The patient characteristics underscore the notion that individuals choosing functional medicine may be proactively seeking solutions for complex, often multi-systemic issues that conventional medicine has struggled to resolve, or they are looking for preventive strategies to avoid developing severe chronic diseases. Understanding these patient profiles is crucial for designing effective functional medicine programs and communication strategies.

What Does the Future Hold for Functional Medicine Research?

The initial studies from the Cleveland Clinic have laid a strong foundation, but they also highlight the need for continued research to fully understand the functional medicine model and its long-term impact. Future studies will aim to delve deeper into the mechanisms behind observed improvements and explore how to optimize care delivery. This ongoing research is vital for integrating functional medicine more broadly into mainstream healthcare.

The Need for Prospective Studies

The initial Cleveland Clinic study was a retrospective cohort study, meaning it looked back at existing patient data. While valuable, this type of study can have limitations. Researchers themselves believe that future prospective studies are needed to further examine the functional medicine model of care and its long-term outcomes [https://newsroom.clevelandclinic.org/2019/10/25/cleveland-clinic-study-finds-functional-medicine-model-is-associated-with-improvements-in-health-related-quality-of-life]. Prospective studies follow patients forward in time, allowing for more controlled data collection and a clearer understanding of cause and effect. This will help confirm the sustained benefits of functional medicine beyond the initial 6-12 month observation periods and explore how different interventions contribute to these long-term results. Such studies could track patient progress over several years, providing invaluable data on the durability of health improvements and the potential for disease reversal or prevention.

Factors Influencing Outcomes

Researchers have identified several factors that may contribute to the improvements in health-related quality of life observed in functional medicine patients. These include inherent differences in the functional medicine model itself, which focuses on root causes and personalized care. The types of patients seeking functional medicine also play a role, as they may be more motivated or have different baseline health statuses, as seen in the demographic data. Additionally, treatment adherence and a strong belief in the model of care are thought to be significant contributors to positive outcomes [https://newsroom.clevelandclinic.org/2019/10/25/cleveland-clinic-study-finds-functional-medicine-model-is-associated-with-improvements-in-health-related-quality-of-life]. Future research could explore these factors in more detail, perhaps through qualitative studies or by segmenting patient groups based on adherence levels. Understanding these influences will allow practitioners to refine their approaches and maximize patient success.

Expanding the Scope of Functional Medicine

The success of shared medical appointments in improving outcomes and reducing costs suggests a promising direction for future functional medicine delivery. Further research could explore the application of SMAs to a wider range of chronic conditions and patient populations. Investigating different group sizes, program durations, and virtual SMA formats could also provide insights into optimizing this model. The concept of personalized lifestyle medicine, which is central to functional medicine, is a growing area of scientific inquiry [https://pubmed.ncbi.nlm.nih.gov/23878520/]. As our understanding of genomics, microbiomes, and individual biological variations expands, functional medicine can leverage these advancements to offer even more precise and effective interventions. Studies on personalized lifestyle interventions are already being called for in areas like the prevention and treatment of obesity-related cancers [https://pubmed.ncbi.nlm.nih.gov/40282431/], underscoring the broad relevance of this approach. The future of functional medicine research will likely involve a combination of rigorous clinical trials, implementation science to integrate best practices, and innovative studies exploring personalized interventions to address complex health challenges.

Frequently Asked Questions

What is the PROMIS questionnaire?

The PROMIS® (Patient-Reported Outcome Measurement Information System) questionnaire is a tool validated by the National Institutes of Health (NIH) used to measure a patient's health-related quality of life over time. It assesses various aspects of global physical and mental health, including fatigue, physical function, pain, gastrointestinal issues, and emotional well-being [https://newsroom.clevelandclinic.org/2019/10/25/cleveland-clinic-study-finds-functional-medicine-model-is-associated-with-improvements-in-health-related-quality-of-life]. A change of 5 points or more on the PROMIS Global Health T-score scales is considered a clinically meaningful improvement, indicating a noticeable effect on daily life. For more details, see Association of Functional Medicine with Quality of Life.

How quickly do patients see improvements in functional medicine?

Cleveland Clinic's research showed that patients can see improvements fairly quickly. At 6 months, 31% of functional medicine patients improved their PROMIS global physical health scores by 5 points or more, which is a clinically meaningful change [https://newsroom.clevelandclinic.org/2019/10/25/cleveland-clinic-study-finds-functional-medicine-model-is-associated-with-improvements-in-health-related-quality-of-life]. In shared medical appointments, patients showed greater improvements in both physical and mental health T-scores within 3 months compared to individual appointments [https://pubmed.ncbi.nlm.nih.gov/33849860/].

Is functional medicine covered by insurance?

The research provided does not directly address insurance coverage for functional medicine. However, the Cleveland Clinic study on shared medical appointments found that SMAs were less costly to deliver than individual appointments [https://newsroom.clevelandclinic.org/2021/04/13/cleveland-clinic-study-finds-functional-medicines-shared-medical-appointments-deliver-improved-patient-outcomes-at-less-cost]. While this indicates cost-efficiency, individual insurance coverage depends on specific plans and providers. Patients should check with their insurance companies to understand their benefits for functional medicine services.

What types of chronic conditions can functional medicine address?

Functional medicine addresses the root causes of chronic disease, making it applicable to a wide range of conditions. The Cleveland Clinic's "Functioning For Life®" shared medical appointment program is designed to address various chronic conditions through the use of food as medicine [https://newsroom.clevelandclinic.org/2021/04/13/cleveland-clinic-study-finds-functional-medicines-shared-medical-appointments-deliver-improved-patient-outcomes-at-less-cost]. The personalized approach of functional medicine means it can be tailored to individuals with complex, multi-systemic issues often associated with chronic diseases.

What is the 'Functioning For Life®' program?

The 'Functioning For Life®' (FFL) program is a 10-week shared medical appointment (SMA) program offered by the Cleveland Clinic Center for Functional Medicine. It is designed to address various chronic conditions by focusing on food as medicine and empowering patients to make positive decisions regarding their health and lifestyle [https://newsroom.clevelandclinic.org/2021/04/13/cleveland-clinic-study-finds-functional-medicines-shared-medical-appointments-deliver-improved-patient-outcomes-at-less-cost]. The program aims to educate patients and help them become advocates for healthy living within their own lives and communities.

Sources

  1. Cleveland Clinic Study Finds Functional Medicine Model is Associated with Improvements in Health-Related Quality of Life. https://newsroom.clevelandclinic.org/2019/10/25/cleveland-clinic-study-finds-functional-medicine-model-is-associated-with-improvements-in-health-related-quality-of-life
  2. Patient outcomes and costs associated with functional medicine-based care in a shared versus individual setting for patients with chronic conditions: a retrospective cohort study - PubMed. https://pubmed.ncbi.nlm.nih.gov/33849860/
  3. Association of the Functional Medicine Model of Care With Patient-Reported Health-Related Quality-of-Life. https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2753520
  4. Cleveland Clinic Study Finds Functional Medicine’s Shared Medical Appointments Deliver Improved Patient Outcomes at Less Cost. https://newsroom.clevelandclinic.org/2021/04/13/cleveland-clinic-study-finds-functional-medicines-shared-medical-appointments-deliver-improved-patient-outcomes-at-less-cost
  5. Personalized lifestyle medicine: relevance for nutrition and lifestyle recommendations - PubMed. https://pubmed.ncbi.nlm.nih.gov/23878520/
  6. Personalized Lifestyle Interventions for Prevention and Treatment of Obesity-Related Cancers: A Call to Action - PubMed. https://pubmed.ncbi.nlm.nih.gov/40282431/

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