Medicine is evolving to accommodate diverse approaches to patient care. Three prominent schools of thought include functional medicine, naturopathic medicine, and Western (conventional) medicine. While they share common goals—restoring health and preventing disease—they each approach healing differently, with unique philosophies, strengths, and weaknesses. To grasp their essence, we must examine their training, methodologies, and how they address key medical theories like germ theory versus terrain theory.
Functional Medicine
Functional medicine is a patient-centered approach that focuses on identifying and addressing the root causes of disease. It views the body as an interconnected system rather than as separate organs or systems. Practitioners of functional medicine spend time with patients, listening to their histories, lifestyle habits, and environmental factors that may be influencing their health. Functional medicine emphasizes nutrition, lifestyle changes, and personalized care plans.
Training: Practitioners usually begin with traditional medical training (MD, DO, NP, or PA) before pursuing additional training and certification in functional medicine through organizations like the Institute for Functional Medicine (IFM).
Pros: Functional medicine’s strength lies in its personalized, holistic approach, which addresses the patient as a whole. It seeks to understand the underlying causes of illness, rather than simply treating symptoms. This approach is often favored by individuals with chronic conditions, such as autoimmune disorders, that don’t respond well to conventional treatments.
Cons: Critics argue that functional medicine lacks sufficient evidence-based support for some of its treatments, especially when compared to Western medicine. Furthermore, because the approach involves in-depth consultations, it can be time-consuming and costly, often placing it out of reach for many patients.

Naturopathic Medicine
Naturopathic medicine also emphasizes holistic care, focusing on prevention and the body’s ability to heal itself. Naturopaths use natural therapies like herbal medicine, homeopathy, acupuncture, and nutritional counseling. Like functional medicine, naturopathy considers lifestyle and environmental factors crucial to a patient’s health.
Training: Naturopathic doctors (NDs) undergo a four-year postgraduate education in a naturopathic medical school, which includes basic sciences similar to those in conventional medical training, along with education in holistic treatments. Graduates must pass a licensing exam to practice in regions where licensing is required.
Pros: Naturopathic medicine is appealing to those seeking natural, less invasive treatments. Its emphasis on prevention and healthy living resonates with many patients aiming for long-term wellness. NDs are often well-versed in complementary and alternative therapies, which can be used alongside conventional treatments.
Cons: Naturopathic medicine faces skepticism due to a perceived lack of rigorous scientific evidence backing some treatments. Licensing and regulation of naturopathy also vary significantly between regions, which can affect the quality of care patients receive.
Western Medicine
Western medicine, often called allopathic or conventional medicine, is the most dominant form of healthcare in much of the world. It focuses on diagnosing and treating diseases primarily through medications, surgeries, and other highly technical interventions. Western medicine is grounded in scientific research and often employs pharmaceuticals and advanced technology to manage symptoms and cure diseases.
Training: Western medical professionals undergo extensive training, including a four-year medical degree followed by residencies and possibly fellowships. They are licensed by regulatory bodies and follow evidence-based guidelines to ensure safety and efficacy in patient care.
Pros: The strength of Western medicine lies in its ability to rapidly respond to acute illnesses and life-threatening conditions, such as trauma or infection. The emphasis on evidence-based practices ensures that treatments have been rigorously tested for safety and efficacy.
Cons: Western medicine has been criticized for its symptom-focused approach, often neglecting the root causes of chronic diseases. Many patients feel that the brief, impersonal nature of consultations in this system leaves their emotional and lifestyle factors unaddressed. Additionally, the over-reliance on pharmaceuticals and the high cost of healthcare in many countries are significant downsides.
Comparing Germ Theory and Terrain Theory
One key philosophical divide between these approaches is their view on the origins of disease. Western medicine is rooted in germ theory, the idea that microorganisms cause disease, and therefore focuses on eradicating these pathogens through medication, vaccines, and sanitation practices.
Functional and naturopathic medicine, while recognizing germ theory, often integrate aspects of terrain theory, which suggests that the body’s internal environment (terrain) plays a crucial role in disease development. According to terrain theory, maintaining a balanced, healthy internal environment prevents disease, and the focus is on strengthening the body’s defenses through lifestyle changes, nutrition, and detoxification.
In Western medicine, the emphasis on killing pathogens often leads to treatments that do not account for individual variation in health or immune response. Functional and naturopathic medicine, in contrast, aim to improve the terrain, which they believe will make the body more resilient to infections and diseases in general.
My Perspective: Functional Medicine as the Optimal Approach
Having explored these three approaches in-depth, I believe that functional medicine offers the most holistic and individualized care. Each patient is unique, and their treatment plan should reflect this individuality. Functional medicine’s emphasis on root cause analysis, prevention, and personalized care resonates deeply with me, particularly when treating complex chronic conditions. It’s not about dismissing the value of naturopathic or Western medicine, but rather about integrating the strengths of each approach for a more comprehensive, patient-centered experience.
“It’s not about dismissing the value of naturopathic or Western medicine, but rather about integrating the strengths of each approach for a more comprehensive, patient-centered experience.”
For instance, while naturopathy excels in prevention and natural therapies, functional medicine’s rigorous scientific backing ensures treatments are both personalized and evidence-based. Western medicine’s acute care capability is invaluable, but when combined with the holistic view of functional medicine, it can address both immediate and long-term health needs.
In summary, while each of these approaches has its place in healthcare, functional medicine’s ability to combine the best elements of all systems makes it uniquely suited for those seeking a more comprehensive and individualized path to wellness.

Written By: Roxanne Oliver, DNP, APRN, FNP-BC
*The information contained in this post is for information only. It does not replace routine follow-up and/or care with a certified and licensed medical provider
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