The Impact of Lifestyle Medicine on Prostate Cancer: Insights from Dr. Stacy Kenfield

The speaker identifies two types of individuals regarding health advice: those who prefer direct instructions without questioning the rationale, and those who seek scientific explanations for lifestyle recommendations.

Dr. Stacy Kenfield, a professor at the University of California, San Francisco (UCSF), specializes in urology, epidemiology, and biostatistics. She holds the Helen Diller family chair in population science of urologic cancer and has been part of UCSF's faculty since 2012. With a master's and doctorate in epidemiology from Harvard School of Public Health, she also directs a global study on exercise for men with metastatic prostate cancer.

Dr. Kenfield has authored hundreds of papers over 20 years, focusing on lifestyle interventions for cancer survivors. The speaker emphasizes that much of his clinical advice is based on Dr. Kenfield's research, highlighting the importance of lifestyle medicine in cancer care.

The discussion emphasizes that lifestyle medicine is not just about improving quality of life but also has potential anti-cancer benefits. The conversation particularly focuses on diet and exercise as crucial factors for men with prostate cancer, aiming to help them thrive despite their diagnosis.

The speaker clarifies that the podcast content is independent of his faculty position at NYU Langone Health, stating that the views expressed are his own and that sponsors are selected to provide high-quality information at no cost to listeners.

The speaker shares a personal anecdote about meeting Dr. Kenfield at the American Neurological Association meeting, expressing admiration for her work and the significant impact it has had on his clinical practice, highlighting her unique contributions to the field of lifestyle and prostate cancer research.

The discussion highlights the consistent findings regarding exercise and smoking in relation to prostate cancer. In 2018, exercise was officially recognized as beneficial for men with prostate cancer in the National Exercise Guidelines for Americans. The speaker notes that while exercise data is robust, dietary data lacks consistency due to varying study methodologies and fewer cohort studies involving men with prostate cancer. This inconsistency makes it challenging to draw definitive conclusions across different studies.

The speaker reflects on the inherent biases present in medical recommendations, particularly when patients consult surgeons who may favor surgical interventions. The speaker emphasizes their own bias towards lifestyle changes, particularly exercise, as a means to improve longevity in prostate cancer patients. They acknowledge the nuances within lifestyle recommendations and express a belief that exercise may have anti-cancer properties, citing recent research that suggests potential regression of prostate cancer cells in laboratory settings.

The speaker discusses the findings from a 2011 study that indicated vigorous physical activity, such as running and tennis, was more beneficial than moderate activity for men with prostate cancer. However, subsequent studies have shown that even light exercise, such as 20 minutes of walking or biking per day, can significantly lower the risk of prostate cancer-specific mortality by approximately 39%. The speaker advocates for high-intensity interval training as an efficient exercise option for those with limited time, emphasizing that any level of physical activity is beneficial.

The speaker categorizes individuals based on their attitudes towards exercise: those who dislike it, those who are indifferent, and those who love it. They stress the importance of consistency in exercise routines, regardless of the individual's initial feelings towards physical activity. The speaker's goal is to encourage success in exercise adherence among all types of individuals, highlighting that finding a suitable exercise approach is crucial for long-term health benefits.

The speaker emphasizes the importance of a prescriptive approach to exercise, particularly for patients undergoing treatment. Reflecting on past experiences, they recall giving patients a challenging program like P90X, which many found overwhelming. This led to a realization that exercise recommendations must be tailored to individual capabilities, especially for those who may not have a physical background. For example, a patient with a more cerebral lifestyle might benefit from a simpler goal of 150 minutes of walking per week, while a more active individual could handle more intense regimens.

In the current study named Prostate 82, which involves 204 men who have undergone radical prostatectomy, participants are encouraged to follow specific exercise guidelines. These include aiming for at least 150 minutes of moderate to vigorous aerobic exercise weekly, engaging in resistance training twice a week with 8 to 10 exercises targeting major muscle groups, and incorporating balance and flexibility exercises at least twice a week. The study is set to run for two years, with outcomes expected to be published in June 2025.

While the outcomes of the Prostate 82 study are still pending, the speaker notes that they will assess changes over time, focusing on PSA recurrence rates and decipher scores in tissue samples, which are linked to prostate cancer outcomes. Additionally, the study will evaluate the impact of diet and exercise on sexual and urinary function, highlighting the comprehensive nature of the research.

The discussion begins with the classification of prostate cancer risk, emphasizing that patients must be at an intermediate or higher risk level to qualify for a radical prostatectomy. The speaker clarifies that they are not dealing with low-risk prostate cancer cases.

The speaker explains the process of measuring the Decipher score, which involves analyzing biopsy tissue and post-surgery tissue. They highlight the importance of tracking changes over time, specifically from the biopsy taken approximately eight weeks before surgery to the tissue collected during the surgery.

The conversation shifts to a remote study protocol that allows participants to live anywhere while receiving personalized coaching. Participants receive reports at baseline, 12 months, and 24 months, assessing their adherence to various health recommendations. This study builds on the Prostate 8 pilot study completed in 2019, which was published in European Urology, where dietary changes were noted, although exercise adherence was challenging.

In the current study, the exercise recommendations have been adjusted to align with national guidelines, suggesting 150 minutes of moderate to vigorous physical activity per week instead of the previous recommendation of three or more hours of vigorous exercise. The speaker acknowledges the difficulty participants face in meeting high exercise thresholds.

To measure exercise intensity, participants wear Polar heart rate monitors linked to a portal. The heart rate data allows participants to track their progress towards the 150-minute goal, with specific heart rate zones defined: zones four and five represent vigorous intensity, while zones two and three indicate moderate intensity.

The speaker elaborates on heart rate zones, explaining that zone two is characterized by a pace where one can converse comfortably, typically a jog or fast walk. They note that achieving vigorous intensity (zone four or five) is challenging for extended periods, as it often involves short bursts of high effort, such as sprinting.

The speaker emphasizes the importance of setting realistic exercise goals for participants, recommending 300 minutes of activity per week while considering individual baselines. The aim is to encourage adherence without overwhelming participants, thereby fostering a sustainable approach to physical activity.

The speaker notes that most of their patients are compliant and willing to follow recommendations, particularly emphasizing the importance of exercise. They highlight that even if patients exercise for an hour daily, remaining sedentary for long periods can still pose cardiovascular risks, suggesting that continuous movement is crucial for overall health.

The discussion shifts to the significance of regular exercise over sedentary behavior, with the speaker asserting that while there is no conclusive data linking sedentary behavior to prostate cancer outcomes, maintaining fitness is essential. They recommend a weekly goal of 150 to 200 minutes of moderate to high-intensity exercise, totaling about six hours of movement, and share personal strategies for incorporating low-intensity activities, such as using a treadmill while working.

The conversation emphasizes the importance of scheduling exercise into one's calendar to ensure consistency. The speaker suggests that planning activities with friends, such as hiking, can make exercising more enjoyable and help time pass quickly, thus encouraging regular physical activity. They recommend starting with a goal of exercising three days a week, especially for those who are not currently active.

Engaging in physical activities, such as weightlifting, with friends or community members enhances the experience significantly. The speaker shares that lifting weights with a friend or neighbor not only makes the workout more enjoyable but also fosters social interaction, allowing them to catch up and discuss current events, highlighting the importance of community for overall health.

The discussion shifts to the serious health implications of cigarette smoking, particularly its connection to prostate cancer. The speaker emphasizes that smoking is not only detrimental to lung health but also significantly increases the risk of prostate cancer, including recurrence and mortality rates. A study published in JAMA in 2012 revealed that current smokers had a 60% higher risk of dying from prostate cancer at diagnosis, underscoring the urgency for smokers to quit as soon as possible.

The speaker advises that quitting smoking can lead to a similar risk of prostate cancer-specific death as non-smokers after ten years of cessation. They stress the importance of utilizing available resources to support quitting, as it can be challenging to do alone. Additionally, reducing cigarette consumption is recommended if quitting immediately is not feasible, as every little bit helps in lowering health risks.

The conversation highlights that most men diagnosed with prostate cancer do not die from it but rather from other chronic diseases, with heart disease being a leading cause of death. The speaker points out the strong association between smoking and heart disease, reinforcing that quitting smoking has numerous health benefits beyond just prostate cancer, including reducing the risk of heart attacks, which claim a life every 30 seconds.

The speaker reflects on the psychology of men regarding their health, noting a tendency to overlook the dangers of smoking in favor of concerns about prostate cancer. They express a personal realization of their own health behaviors and the need for change. The speaker emphasizes the importance of addressing heart disease risks, which are often overshadowed by the anxiety surrounding prostate cancer screenings and PSA tests.

The speaker emphasizes the importance of quitting smoking, noting that it is detrimental to health. They suggest starting with a reduction strategy, such as cutting down from a pack a day to half a pack, and focusing on specific triggers, like smoking only after meals.

The discussion shifts to dietary recommendations, highlighting the confusion surrounding various diets. The speaker, having researched diets for over 30 years, refrains from taking sides in the ongoing 'diet wars.' They specifically recommend cooked tomatoes for prostate cancer patients due to the increased bioavailability of lycopene when cooked, and suggest adding olive oil to enhance absorption.

In addition to cooked tomatoes, the speaker advocates for the consumption of cruciferous vegetables like broccoli, cauliflower, and Brussels sprouts, which contain detoxifying compounds. They also recommend eating fish, particularly one to two servings per week, highlighting salmon, sardines, and mackerel as beneficial options due to their omega-3 fatty acids.

The speaker discusses the differences between farmed and wild fish, noting that while wild fish may have higher omega-3 levels, there is no definitive data on which is better for prostate cancer outcomes. They acknowledge the health-conscious nature of the audience, particularly in California, and reiterate the importance of including fish like salmon in the diet.

The speaker advises avoiding red and processed meats, particularly processed options like bacon, hot dogs, and cold cuts, which are preserved through salting, smoking, or curing. They suggest limiting red meat to one serving per week if complete avoidance is not possible, emphasizing the health risks associated with processed meats.

The speaker discusses their preference for grass-fed 100% beef hot dogs during ball games, emphasizing moderation in indulgences like hot dogs and beer. They highlight that occasional consumption of certain foods does not directly cause prostate cancer; rather, it is the accumulation of such foods over time that may lead to health issues. The speaker advocates for a balanced approach to diet, particularly encouraging the consumption of fruits and vegetables.

The conversation shifts to the benefits of healthy fats, such as those found in nuts, olive oil, and avocado oil, which are recommended for improving prostate cancer outcomes. The speaker notes that a daily intake of a handful of nuts and healthy oils is beneficial, while advising a reduction in saturated fats. They specifically mention that whole milk has been shown to be harmful to prostate cancer outcomes, with a threshold of four glasses per week being significant, suggesting that lower-fat or plant-based milks are preferable.

Addressing a common question about dairy, the speaker indicates that a small amount of cream in coffee is unlikely to pose significant health risks, as there is no substantial evidence against such a practice. They emphasize that maintaining an active lifestyle can mitigate some dietary concerns, allowing for more flexibility in food choices.

The discussion delves into the potential link between saturated fats and prostate cancer. The speaker expresses skepticism about the role of protein in cancer outcomes, suggesting that the evidence points more towards saturated fats as a risk factor. They explain that cancer cells may be signaled to replicate continuously, although the exact mechanisms behind this signaling, particularly in relation to saturated fats, remain unclear.

The speaker concludes by cautioning against processed foods, including processed meats and carbohydrates, which are generally considered unhealthy. They clarify that while red meat is often scrutinized, their research indicates it is not as significant a contributor to prostate cancer risk compared to processed foods.

Research indicates a strong correlation between processed meats and prostate cancer, with significant findings emerging from the speaker's team. The discussion highlights that cooking methods, particularly high-heat techniques like grilling and pan-frying, can produce carcinogenic compounds such as heterocyclic amines. The speaker reassures that consuming grilled meat occasionally, such as at summer barbecues, is acceptable as long as it is done in moderation.

The speaker notes that while their research has not specifically focused on cooking methods, there is a general understanding that the preparation of meat, especially through curing and smoking, can lead to the formation of cancer-causing chemicals. They emphasize the need for more cohort studies to better understand the impact of different cooking methods on health, as many existing studies often involve unhealthy meat-eaters who engage in other detrimental lifestyle choices.

The speaker advocates for a balanced diet, suggesting that a healthy plate should consist of half vegetables and fruits, a quarter lean protein (such as fish, skinless chicken, or plant-based proteins), and a quarter starchy carbohydrates like sweet potatoes or whole grains. They stress the importance of focusing on what to eat rather than what to avoid, promoting a positive approach to dietary choices.

The speaker discusses the health implications of consuming chicken skin, indicating that it may harbor environmental toxins and saturated fats. They suggest that removing the skin is advisable for those concerned about health risks, reflecting on the evidence that supports this recommendation. The speaker acknowledges the discomfort this advice may cause but emphasizes the importance of making informed dietary choices.

The discussion emphasizes the health implications of grilling chicken, particularly the formation of cancer-causing compounds. It is suggested that removing the skin before grilling can mitigate these risks, making grilled chicken a healthier option. The speaker acknowledges that personal preferences and cooking methods may influence whether one chooses to remove the skin.

The speaker advises against taking dietary supplements without a doctor's recommendation, highlighting the risks associated with high-dose supplements. Specifically, high-dose selenium supplementation has been linked to an increased risk of prostate cancer death, as noted in the Health Professionals Follow-Up Study. The speaker suggests that most individuals obtain sufficient selenium from their diet and emphasizes the importance of testing nutrient levels before considering supplementation.

The speaker points out that many people are deficient in vitamin D and recommends testing to determine individual levels before supplementing. Additionally, individuals following a vegan diet are advised to take vitamin B12 supplements. The overarching message is to consult with a healthcare provider before making any decisions regarding supplementation.

The conversation shifts to the potential dangers of excessive zinc intake, with research suggesting that consuming more than 100 milligrams of zinc daily may increase prostate cancer risk. Despite zinc being essential for prostate health, moderation is crucial. Similarly, the speaker warns against high doses of folic acid, indicating that both nutrients require careful management to avoid adverse effects.

The speaker critiques the SELECT trial regarding vitamin E supplementation, noting that the synthetic form used in the study differs from the natural form found in foods like almonds. This raises concerns about the validity of the trial's findings. Additionally, the speaker references a 1996 JAMA trial that indicated selenium could reduce cancer risk, contrasting it with the forms of selenium used in the SELECT trial, which may not have been as effective. The discussion highlights the importance of using appropriate forms of nutrients in research to draw accurate conclusions.

The discussion emphasizes the importance of consuming whole foods over supplements, particularly highlighting the benefits of lycopene found in tomatoes and tomato sauce. The speaker advises against hyper-standardizing natural products and suggests that certain nutrients, like carotenoids, may work synergistically. While supplements can be necessary under medical advice, the focus should remain on whole foods. The speaker also mentions the complexity of herbal supplements, citing curcumin as beneficial, but humorously notes the potential social consequences of consuming too much curry.

The speaker warns about the risks associated with excessive supplementation, noting that many patients come with a plethora of supplements, some of which may be harmful. For instance, taking over 100 milligrams of zinc or 600 micrograms of selenium can pose health risks, including promoting prostate cancer. The speaker stresses that supplementation should be a last resort, with diet and lifestyle changes prioritized.

In concluding thoughts, the speaker emphasizes the significance of exercise, diet, and smoking cessation as foundational elements for health, particularly in relation to prostate cancer. They highlight the importance of sleep and its impact on diet and exercise motivation. The speaker dismisses the notion of a 'magic' food or supplement, asserting that consistent exercise, even as little as 20 minutes a day, is crucial for health.

The speaker discusses the future direction of lifestyle medicine, focusing on personalized approaches that consider individual circumstances and resources. They advocate for tailoring health programs to fit the unique barriers and strategies of each person, recognizing that lifestyle changes must be adaptable to be effective. The conversation also touches on the synergistic anti-cancer properties of combining exercise and diet, with references to myokines released during physical activity that may have protective effects against cancer.

The discussion emphasizes the importance of lifestyle medicine in cancer treatment, particularly its anti-cancer benefits. The speaker believes that every person diagnosed with cancer should engage in a lifestyle medicine program, as it offers actionable steps regardless of the specific cancer type. The conversation highlights the role of food and its metabolites in potentially providing anti-cancer properties, stressing that proper circulation is essential for these benefits to be realized. Physical activity is noted as a crucial factor in enhancing circulation, thereby improving the effectiveness of dietary interventions.

Dr. Stacy Kenfield from UCSF Urology shares resources available on their website, specifically tailored for men with prostate cancer. The website, urology.ucsf.edu, offers diet and exercise guides, along with cooking tips for recommended foods. The speaker expresses gratitude for the scientific foundation provided by Dr. Kenfield's research, which has significantly informed their approach to lifestyle medicine for prostate cancer.

The importance of a science-based approach to lifestyle medicine is reiterated, particularly in the context of prostate cancer. The speaker stresses that relying on scientific studies, rather than anecdotal evidence, is crucial for developing effective guidelines for treatment. They encourage men to not only survive prostate cancer but to thrive, underscoring that lifestyle medicine is a legitimate form of treatment that can lead to improved health outcomes.

The episode concludes with an invitation for listeners to engage further by subscribing to the Dr. G podcast on YouTube and leaving five-star reviews on platforms like Apple and Spotify. These actions are encouraged to help reach more men interested in improving their urological health. Additionally, the speaker promotes their newsletter at drgeo.com for the latest research and actionable insights in men's health and integrative urology.