Why Diets Fail

Greenfield advocates for a highly individualized approach to diet, moving away from dogmatic, one-size-fits-all recommendations. He explains that factors like genetics, detoxification capabilities, methylation, blood flow, microbiome composition, and hormone status vary wildly among individuals. Therefore, a diet that works well for one person (e.g., a high-fat, high-protein diet) could be detrimental to another with different physiological needs or genetic predispositions (e.g., ApoE4/E4 gene, overmethylation issues, or high carbohydrate needs due to intense physical activity). The core principle is to use self-quantification tools like genetic testing, blood panels, and activity tracking to understand one's unique biological landscape and tailor dietary choices accordingly, rather than blindly following popular diet trends.

For those unable to pursue extensive self-quantification, Greenfield suggests a Mediterranean diet as a reliable fallback. He clarifies that this isn't the Americanized version with excessive bread and large portions, but rather a diet rich in omega-3 fatty acids, diverse vegetables (both fermented and raw), extra virgin olive oil, nuts, natural cheeses, and occasional red wine. This approach is considered beneficial due to its historical alignment with human dietary origins in the fertile crescent and its ability to foster a robust and diverse gut microbiome, which is crucial for overall health.

Greenfield details his personal strategy for carbohydrate intake, which involves consuming very few carbs throughout the day (e.g., small amounts in a morning smoothie, none at lunch) and then having the bulk of his carbohydrates with dinner. This approach offers social and logistical flexibility, as dinner is often the most variable meal. From a physiological standpoint, consuming carbs in the evening can aid in serotonin production, which in turn supports melatonin synthesis for improved sleep. While acknowledging the common belief that insulin sensitivity is higher in the morning, he argues that temporary insulin sensitivity can be induced in the evening through physical activity (e.g., a post-dinner walk, early evening workout, or cold exposure). This makes the muscles, which have been somewhat deprived of glucose throughout the day, act as a 'metabolic sink' for the evening carbohydrates, preventing blood sugar spikes.

Greenfield outlines a nuanced approach to fasting for athletes, acknowledging the tension between performance and longevity. He suggests that active males can comfortably fast for 12-14 hours daily, while premenopausal females should limit their daily fast to around 10 hours to avoid disrupting kisspeptin, a hormone crucial for fertility and endocrine function, especially if they are lean. To support fasted workouts, he recommends consuming ketones (like ketone IQ or ketone aid) and leucine-enriched essential amino acids (EAAs) beforehand. Ketones provide energy without breaking the fasted state or spiking blood glucose, potentially enhancing fasting benefits. EAAs help maintain an anabolic state and prevent muscle catabolism with minimal caloric and insulin impact. For deeper cellular benefits like autophagy, he advises incorporating a 24-hour fast (dinner-to-dinner) once or twice a month, ideally on a recovery day when caloric and anabolic needs are lower, thus minimizing stress on the body.

Greenfield stresses the inadequacy of relying solely on lipid panels for heart health assessment, noting that individuals with good lipid profiles can still have significant plaque, and vice versa. He recommends starting with a carotid ultrasound (CIMT score) as a non-invasive, accessible option that correlates with heart health. For more detailed information, he suggests a CT angiography, specifically mentioning the 'Clearly scan,' which can differentiate between stable and unstable (soft vs. hard) plaque and pinpoint its location and infiltration. While acknowledging radiation concerns with CT scans, he notes that faster machines minimize exposure and that even a single scan can provide valuable insights. He advises men with a family history of heart disease to start monitoring as early as 30, and women around perimenopause. Given recent concerns, he also suggests earlier monitoring of inflammatory markers for anyone who has had COVID-19 or vaccination.

Greenfield discusses both allopathic and natural strategies for plaque regression. The allopathic 'gold standard' involves a low-dose statin combination (e.g., rosuvastatin and ezetimibe) sometimes paired with a PCSK9 inhibitor. He notes that PCSK9 inhibitors, while effective, can be very expensive and raise theoretical concerns about long-term systemic effects on cholesterol availability for endocrine and brain function. Statins carry a risk of CoQ10 depletion and muscle soreness, which can be mitigated by supplementing with ubiquinol or anato extract. For natural approaches, he mentions red yeast rice, niacin, magnesium, red light therapy, PEMF, and nitric oxide-rich foods (beets, arugula). He specifically highlights nattokinase and lumbrokinase as top natural options for plaque regression, emphasizing that nattokinase requires high doses (8,000-10,000 units) for clinical efficacy. He also mentions a product he helped develop, Vitaboom Heart Health, which combines several effective nutraceuticals.

Greenfield asserts that cellular and mitochondrial health are the foundational principles for all organ systems. He outlines several key strategies: 1. **Cell Membrane Health:** Achieved through proper fat intake, especially omega-3s, and avoiding fat-phobic diets. He recommends an Omega Quant test to ensure an omega-3 index of 8% or higher. 2. **Reactive Oxygen Species (ROS) Quelling:** Emphasizes dietary diversity, particularly plant diversity, to provide flavanols and polyphenols that neutralize ROS and boost endogenous antioxidant production. He critiques restrictive diets like carnivore for lacking this diversity unless modified with fermented vegetables. 3. **Electrochemical Balance:** Stresses the importance of adequate mineral intake, as modern farming practices deplete soil minerals. He recommends trace liquid minerals, good quality salt, electrolytes, and mineral-rich foods. 4. **Natural Energy Enhancers:** Highlights the benefits of pulsed electromagnetic field (PEMF) therapy, grounding/earthing (barefoot contact with earth), and photobiomodulation (sunlight, red light panels). These natural elements assist with electrochemical balance and enhance the activity of the electron transport chain, thereby increasing ATP production in mitochondria.

Greenfield explains the importance of the vagus nerve, which innervates various organs and influences the balance between the sympathetic and parasympathetic nervous systems. Heart Rate Variability (HRV), measurable with rings or wristbands, serves as an indicator of vagal nerve activation. High HRV signifies a robust and adaptable nervous system, while low HRV suggests stress, overtraining, or a 'flat' nervous system. He lists traditional practices like meditation, chanting, singing, humming, gargling, yoga, and breathwork as effective ways to naturally increase HRV. Additionally, he mentions modern technological devices like True Vega or Hulist, which provide electrical stimulation to the auricular branch of the vagus nerve, offering rapid HRV improvement for situations like anxiety, pre-flight jitters, or sleep issues. For severe cases like PTSD, medical interventions such as stellate ganglion nerve blocks are also noted.

Greenfield explains that human beings exhibit significant variance in physiological aspects like vitamin D and oxalate excretion rates, organ sizes, and genetic predispositions. This individuality extends to detoxification, methylation, blood flow, nitric oxide capabilities, and the unique composition of each person's microbiome, including potential parasites, yeast, and fungi, all of which influence how different foods are processed and impact health. He argues that advocating for a universal diet ignores these profound differences, citing examples like how a high-fat, high-protein diet might negatively affect someone with specific genetic markers (e.g., ApoE4/E4) or high physical activity levels requiring more carbohydrates.

Greenfield elaborates on the concept of temperance in exercise, defining it not as complete restriction but as the ability to modulate and self-control usage to achieve a 'Goldilocks zone.' He cites research indicating that exceeding certain thresholds of high-intensity (75 minutes/week of Zone 4/5 cardio) or moderate-intensity (150 minutes/week) exercise can lead to arterial stiffness and early onset atherosclerosis. He contrasts this with primal human movement patterns, which involve low-level, aerobic activity with intermittent bursts, rather than sustained high-intensity efforts. This perspective is crucial for athletes who might prioritize performance over long-term health, suggesting a need to re-evaluate their training intensity and duration for longevity.

He notes that while traditional plaque issues are a concern, the vascular infiltration or inflammation potentially caused by spike proteins from COVID-19 or vaccination may not manifest as typical plaque. Instead, it might be indicated by inflammatory markers like cytokines and hsCRP. This introduces a new layer of complexity to heart health monitoring, especially for younger, active individuals who might not otherwise be considered at high risk for cardiovascular events. He also mentions advanced, expensive blood filtration techniques (like the serif filter) available in clinics abroad as a potential way to remove spike proteins, highlighting the severity and complexity of this emerging health challenge.

Greenfield explains that many people, including himself and historical philosophers like C.S. Lewis and Augustine, experience an 'eternal hole in the soul' – a gnawing for something greater than themselves. He argues that this void cannot be filled by material possessions, fame, or even peak physical fitness, as these pursuits often lead to a continuous chase for 'more.' He suggests that true fulfillment comes from connecting with an eternal purpose and a higher power. While acknowledging the dogmatism and confusion around religion, he points to research supporting the positive impact of prayer, church attendance, and intrinsic religiosity on health. He, as a Christian, describes casting cares upon Jesus as a path to freedom from guilt and shame, leading to a state of 'contentedness' rather than constant happiness. This contentedness means knowing that things will get better, being present, trusting God, and doing one's best without despair over failure, ultimately transforming one's approach to life and pursuits.