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DavidPerlmutterMD · 2022-03-28 · David Perlmutter (host), Max Lugavere

What to Eat for Optimal Brain Health - with Max Lugavere | The Empowering Neurologist EP. 147

48 research-tied claims examined: 2 contradicted 5 overstated 5 context 33 supported 3 unverified

33

Supported by research

0:07:03Max Lugaveresupportedmoderate

Neurodegenerative conditions like Alzheimer's begin 20 to 30 years prior to the presentation of clinical symptoms.

"these conditions begin decades before the presentation of symptoms, by some accounts 20 to 30 years." (said at 0:07:03)

Biomarker and neuroimaging studies demonstrate that the pathophysiological changes associated with Alzheimer's disease—specifically amyloid-beta accumulation, tau pathology, and subtle structural changes—begin 15 to 25 or more years before the clinical manifestation of symptoms. For instance, data from the Dominantly Inherited Alzheimer Network (DIAN) demonstrated significant declines in cerebrospinal fluid (CSF) Aβ42 beginning approximately 25 years before expected symptom onset, followed by detectable amyloid-PET retention and elevated CSF tau approximately 15 years before symptoms appear.

0:09:37David Perlmutter (host)supportedlow

A study demonstrated that measuring belly size predicts Alzheimer's risk 34 years in the future.

"Another study demonstrated that just measuring the size of the belly predicts Alzheimer's 34 years in the future." (said at 0:09:37)

A large longitudinal cohort study of 6,583 Kaiser Permanente members who had their sagittal abdominal diameter (belly height/depth) measured between 1964 and 1973 found that central obesity at midlife significantly predicted dementia risk over three decades later (an average follow-up of 36 years). Participants in the highest quintile of sagittal abdominal diameter had nearly three times the risk of developing dementia compared to those in the lowest quintile (hazard ratio 2.72, 95% CI 2.33–3.33), an association that persisted after adjusting for body mass index, demographic factors, and cardiovascular comorbidities. While the primary endpoint analyzed was overall dementia, the findings directly support the speaker's description of the study.

  • supports: Central obesity and increased risk of dementia more than three decades later. (Neurology 2008) · cited 802x in the literature
    "A longitudinal analysis was conducted of 6,583 members of Kaiser Permanente of Northern California who had their sagittal abdominal diameter (SAD) measured in 1964 to 1973. Diagnoses of dementia were from medical records an average of 36 years later, January 1, 1994, to June 16, 2006... Compared with those in the lowest quintile of SAD, those in the highest had nearly a threefold increased risk of dementia (hazard ratio, 2.72; 95% CI, 2.33-3.33)" (abstract, methods and results, passage verified)
    pubmedfull study (doi)
0:12:39David Perlmutter (host)supportedhigh

Approximately 6 million individuals in America are currently affected by Alzheimer's disease.

"the 6 million individuals in America and their families are going through right now." (said at 0:12:39)

Epidemiological estimates from the Alzheimer's Association report that approximately 6.2 to 6.5 million Americans aged 65 and older are currently living with Alzheimer's dementia.

0:16:14Max Lugaveresupportedmoderate

A University of Georgia study found that supplementation with the carotenoids lutein and zeaxanthin resulted in a 20% increase in visual processing speed in young, healthy college students.

"There was a wonderful University of Georgia study that found that in young, healthy college students, that supplementation with carotenoids, these plant pigments called lutein and zeaxanthin, led to a 20% boost in visual processing speed." (said at 0:16:14)

Researchers at the University of Georgia's Vision Sciences Laboratory conducted randomized, double-blind, placebo-controlled trials evaluating macular carotenoid supplementation (lutein and zeaxanthin) in young, healthy college students. They demonstrated significant improvements in objective measures of visual and neural processing speed, including temporal contrast sensitivity function (tCSF), critical flicker fusion thresholds (~12%), and visual motor reaction times (~10%).

0:17:16Max Lugaveresupportedhigh

Creatine is found naturally only in animal products like beef and fish, and is absent from non-animal products.

"creatine is considered a carnonutrient, it's found only in beef and fish, so you don't find creatine in non-animal products" (said at 0:17:16)

Published nutritional and biochemical literature confirms that naturally occurring dietary creatine is found almost exclusively in animal tissues, primarily meat (such as beef) and fish, and is virtually absent from plant-based foods.

0:17:46Max Lugaveresupportedmoderate

Based on the Digestible Indispensable Amino Acid Score (DIAAS), animal protein possesses the highest protein digestibility and protein quality found in nature.

"we know, thanks to the Digestible Indispensable Amino Acid Score, that animal protein is the highest that we find in nature with regard to protein digestibility and protein quality" (said at 0:17:46)

Under the Digestible Indispensable Amino Acid Score (DIAAS) framework recommended by the Food and Agriculture Organization (FAO), animal-source proteins (such as dairy, eggs, meat, and fish) consistently demonstrate the highest standardized ileal amino acid digestibility and overall protein quality scores (frequently exceeding 100%, classified as 'excellent' protein quality). In contrast, unprocessed and typical whole-plant proteins generally exhibit lower digestibility and DIAAS values due to matrix constraints and limiting indispensable amino acids.

0:18:16Max Lugaveresupportedmoderate

A study found that frailty increased the risk of developing Alzheimer's disease by threefold among individuals at high genetic risk.

"there was a study, Dr. Perlmutter, that came out actually that looked at people who were at high genetic risk for developing Alzheimer's disease, and what was the key characteristic that determined in this study one's risk by threefold? Frailty." (said at 0:18:16)

Large prospective cohort analyses from the UK Biobank have evaluated the combined impact of physical frailty and genetic predisposition on incident dementia and Alzheimer's disease. These studies demonstrated that frailty substantially amplifies dementia risk across genetic strata: overall, frailty was associated with a roughly 2.3- to 2.8-fold increased risk of dementia, and individuals with both high polygenic risk and physical frailty had an approximately 3.9-fold higher risk of developing dementia compared to non-frail individuals with low genetic risk.

0:19:10Max Lugaveresupportedlow

Research from Rush University showed that people who consume a serving of dark leafy greens daily have brains that test up to 11 years younger cognitively.

"Researchers out of Rush University actually found that people who consume a big bowl of dark leafy greens every day have brains that perform up to 11 years younger." (said at 0:19:10)

A prospective study from the Rush Memory and Aging Project (Morris et al., 2018) followed 960 older adults (ages 58–99) over an average of 4.7 years. Participants in the highest quintile of green leafy vegetable consumption (median 1.3 servings/day) had a significantly slower rate of cognitive decline compared to those in the lowest quintile, equivalent to being 11 years younger in age after multivariable adjustment. Because this is an observational prospective cohort study, it demonstrates an association rather than proven causality.

0:21:24David Perlmutter (host)supportedlow

Higher levels of specific bacteriophages in the human gut are associated with better cognitive executive function.

"we know now that higher levels of certain bacteriophages, meaning the viruses in the gut, are associated with better cognitive executive function in humans versus higher levels of other bacteriophages." (said at 0:21:24)

A 2022 study published in Cell Host & Microbe examined the gut virome across a discovery cohort (n = 114) and a validation cohort (n = 942) in humans. The researchers found that individuals with higher levels of Caudovirales and Siphoviridae bacteriophages exhibited significantly better performance in executive function and verbal memory tasks. In contrast, higher levels of Microviridae bacteriophages were associated with poorer executive performance. While these human findings are observational/cross-sectional (warranting low GRADE certainty), complementary causal mechanisms were observed in mouse microbiota transplantation and Drosophila dietary supplementation models.

0:21:54David Perlmutter (host)supportedvery low

Transplanting fecal material from humans with high levels of cognitive-associated gut bacteriophages into mice improves executive and memory function in the mice.

"if you take the fecal material from a human that has higher levels of the good viruses in the gut that regulate the bacteria and you transplant that into a mouse model, its executive function, its memory function as well will improve." (said at 0:21:54)

A 2022 study in Cell Host & Microbe (PMID: 35176247) demonstrated that higher levels of Caudovirales bacteriophages (specifically Siphoviridae) in humans were associated with better executive function and verbal memory. When fecal microbiota from human donors with high levels of these bacteriophages was transplanted into mice, the recipient mice showed increased scores in the novel object recognition test (a test of recognition memory) and upregulation of memory-promoting immediate early genes in the prefrontal cortex. Because this causal claim relies on preclinical animal experiments and observational human cohorts, certainty is rated as very low.

0:23:59Max Lugaveresupportedmoderate

Nine in ten adults in the United States have at least one component of metabolic syndrome.

"research showing us that nine in ten adults have some component of metabolic syndrome" (said at 0:23:59)

A nationally representative analysis of the National Health and Nutrition Examination Survey (NHANES 2009–2016, n = 8,721) evaluated metabolic health using standard cardiometabolic risk components (elevated waist circumference, elevated fasting glucose/HbA1c, elevated blood pressure, elevated triglycerides, and low HDL cholesterol, or being on medications for these conditions). The authors found that only 12.2% of American adults were metabolically healthy (meeting all optimal criteria without medication), indicating that approximately 87.8% (nearly 9 in 10) of US adults had at least one suboptimal component of metabolic syndrome.

0:23:59Max Lugaveresupportedmoderate

By the year 2030, one in two adults will be obese.

"by the year 2030, one in two adults are going to be not just overweight, but obese" (said at 0:23:59)

A landmark projection study published in the New England Journal of Medicine (Ward et al., 2019) analyzed data from over 6.2 million US adults in the Behavioral Risk Factor Surveillance System (BRFSS), corrected using measured data from NHANES. The authors projected that by 2030, nearly 1 in 2 adults in the United States (48.9%; 95% CI, 47.7 to 50.1%) will have obesity (BMI ≥ 30), with prevalence exceeding 50% in 29 states.

0:25:23Max Lugaveresupportedlow

Studies show that people who consume higher amounts of dietary protein tend to have lower amyloid burden in the brain.

"We see studies that people who consume more protein tend to have lower amyloid burden in the brain" (said at 0:25:23)

A cross-sectional study of cognitively normal older adults from the Australian Imaging, Biomarkers and Lifestyle (AIBL) study evaluated dietary intake and brain amyloid-beta (Aβ) deposition measured via PiB-PET scans (n = 162). Participants in the lowest and middle tertiles of protein intake had 12.59-fold and 8.43-fold higher odds, respectively, of having high brain amyloid burden compared to those in the highest tertile of protein intake. Because this evidence is cross-sectional and observational, causality cannot be established, warranting a low certainty rating.

0:25:55Max Lugaveresupportedmoderate

A study by Stuart Phillips of McMaster University found that high-protein, animal-sourced foods contain micronutrients that are commonly underconsumed in their most bioavailable form.

"There was a study published by Stuart Phillips, who's a protein expert at McMaster University, who found that high-protein foods, and particularly animal-sourced foods, tend to contain micronutrients that are typically underconsumed, and not just that, but in their most bioavailable form." (said at 0:25:55)

Stuart Phillips (McMaster University) and colleagues have published analyses of dietary protein sources and nutrient profiling systems emphasizing the micronutrient density and bioavailability of animal-sourced foods. Specifically, Phillips and co-authors note that evaluations of diet quality often fail to account for essential shortfall nutrients and bioavailability, and point out that animal-source foods (such as dairy, meat, and fish) provide critical, highly bioavailable micronutrients that are frequently underconsumed in target populations.

0:14:41Max Lugaveresupportedmoderate

Processing speed is one of the first features of cognition to decline in Alzheimer's disease.

"They boost an aspect of our cognition called processing speed, which is one of the first features of our cognition to decline in Alzheimer's disease" (said at 0:14:41)

Longitudinal biomarker and neuropsychological studies indicate that processing speed, alongside episodic memory and attention measures, shows some of the earliest detectable declines during the preclinical stages of Alzheimer's disease. For example, in longitudinal PET imaging of clinically normal older adults, emerging beta-amyloid accumulation is associated with early declines in processing speed measures (such as the Digit Symbol Substitution Test and Trail Making Test Part A) even before widespread neocortical tau deposition and extensive memory deficits emerge.

  • supports: Association of Emerging β-Amyloid and Tau Pathology With Early Cognitive Changes in Clinic… (Neurology 2022) · cited 73x in the literature
    "Steeper PiB slopes were associated with declining processing speed (Digit Symbol Substitution Test [DSST], Trail Making Test Part A) in those <CL20 and expanded to include learning/memory retrieval (FCSRT-FR], Selective Reminding Test Total Recall [SRT-tr], Logical Memory Immediate Recall) in the <CL40 group... Early, Aβ-mediated cognitive slowing was detected for processing speed measures, while early memory retrieval declines were associated with emerging Aβ and tau pathology." (abstract, results and conclusions, passage verified)
    pubmedfull study (doi)
0:19:09Max Lugaveresupportedlow

Gut bacteria produce postbiotics like butyrate that directly support neuroplasticity.

"churn out compounds referred to as postbiotics, like butyrate, which directly support neuroplasticity." (said at 0:19:09)

Gut bacteria ferment dietary fibers to generate short-chain fatty acids (SCFAs) like butyrate, which act as bioactive postbiotic metabolites along the gut-brain axis. Experimental and preclinical research confirms that butyrate directly modulates neuroplasticity by enhancing hippocampal long-term potentiation (LTP), acting as a histone deacetylase (HDAC) inhibitor to upregulate brain-derived neurotrophic factor (BDNF) and neuroplasticity-related genes, and protecting neurogenesis. However, direct evidence for these mechanistic pathways comes primarily from animal, ex vivo, and cell-culture models, with human clinical trial data remaining preliminary.

0:25:15Max Lugaveresupportedhigh

Protein is the most satiating of the macronutrients, more so than carbohydrates and fat.

"We know that protein is the most satiating of the macronutrients, more so than carbs and fat" (said at 0:25:15)

The claim accurately reflects the established nutritional evidence regarding the satiety hierarchy of macronutrients. Controlled dietary trials and reviews demonstrate that, calorie-for-calorie, protein produces the strongest and most sustained suppression of hunger and subsequent ad libitum energy intake compared with carbohydrates and dietary fats (protein > carbohydrate > fat). This satiating effect is mediated in part by prolonged suppression of ghrelin and enhanced release of anorexigenic gastrointestinal hormones such as cholecystokinin (CCK), glucagon-like peptide-1 (GLP-1), and peptide YY (PYY).

0:33:24Max Lugaveresupportedmoderate

Only 11% of the sodium consumed by the average American comes from salt added directly at the table or during home cooking.

"However, it's important for people to recognize that only 11% of the sodium that your average person ingests comes from what they add to their food via their own salt shakers or what they add to their foods when crafting various recipes." (said at 0:33:24)

Dietary assessment studies evaluating sources of sodium in the US diet confirm that approximately 10.5% to 11.3% of total dietary sodium comes from discretionary salt added at the table or during home cooking combined. In a landmark multi-region study of US adults (Harnack et al., 2017), salt added in home food preparation accounted for 5.6% and salt added at the table accounted for 4.9% of total sodium intake (totalling 10.5%), while commercially processed and restaurant foods outside the home accounted for over 70%. Earlier landmark research (Mattes and Donnelly, 1991) similarly found that table salt (6.2%) and cooking salt (5.1%) combined accounted for approximately 11.3% of total sodium intake.

0:36:47Max Lugaveresupportedmoderate

Bread and rolls are the number one source of dietary sodium in the Standard American Diet.

"But I think it is important to recognize that the number one source of dietary sodium in the Standard American Diet, it's not processed meat, it's not canned foods, it's bread and rolls, Dr. Perlmutter." (said at 0:36:47)

National dietary surveillance data from the CDC and the National Health and Nutrition Examination Survey (NHANES / What We Eat in America) identify "bread and rolls" as the leading individual food category contributor to daily sodium consumption among Americans, accounting for more sodium intake than categories like cold cuts/cured meats, pizza, or canned soups. While individual servings of bread are not necessarily high in sodium density, the high frequency and volume of bread consumption across the population make it the top aggregate dietary source.

0:37:46David Perlmutter (host)supportedhigh

There is no dietary fiber in any animal product.

"So we talked about fiber and the need for fiber, and just to make the point that there is no fiber in any animal product, therefore that's an argument in favor of eating more plants." (said at 0:37:46)

Dietary fiber consists of non-digestible carbohydrates and lignin naturally found in plant cell walls (such as in whole grains, fruits, vegetables, legumes, nuts, and seeds). Natural animal products—including meat, poultry, fish, eggs, and dairy—do not contain dietary fiber.

0:38:46Max Lugaveresupportedhigh

25% of the total cholesterol in the human body is located in the brain.

"25% of the cholesterol in your body is housed in your brain." (said at 0:38:46)

Human lipid physiology establishes that the central nervous system, despite accounting for only about 2% of total body mass, contains approximately 23% to 25% (roughly one-quarter) of the unesterified cholesterol in the human body, predominantly within myelin sheaths and neuronal/glial cell membranes.

0:39:04Max Lugaveresupportedmoderate

About 90% of adults do not consume the adequate daily intake of choline.

"In fact, an egg yolk is the top source of choline that I'm familiar with in the modern food environment, and about 90% of adults don't consume the adequate intake for choline on a daily basis." (said at 0:39:04)

Nationally representative dietary survey data from the United States (NHANES) consistently show that approximately 90% to 93% of adults fail to meet the Adequate Intake (AI) recommendation for choline. Analyses of NHANES data found that only about 6.6% to 8.0% of US adults aged 19 and older achieve the AI for choline from food sources, with egg consumption being a primary dietary factor associated with reaching the AI.

0:43:23David Perlmutter (host)supportedmoderate

A 2017 practice guideline published in Neurology by the American Academy of Neurology evaluated 14 interventions for mild cognitive impairment and concluded only physical exercise was effective in slowing cognitive decline.

"It was in 2017, published in the journal Neurology, which is kind of the bible of neurology. It comes from the American Academy of Neurology... They looked at 14 different interventions, including the drug Aricept, which is what we were just talking about before, the cholinesterase inhibitor, memantine, all the drugs. They concluded that one thing is effective in slowing a person's risk for Alzheimer's or slowing their rate of decline when they have MCI, or mild cognitive impairment, and it was a drug called exercise, as a matter of fact." (said at 0:43:23)

The American Academy of Neurology's practice guideline update on mild cognitive impairment (MCI), published online in December 2017 in Neurology (print January 2018), systematically evaluated pharmacologic and nonpharmacologic interventions. The guideline concluded that no high-quality evidence supports pharmacologic treatments (such as cholinesterase inhibitors) for MCI, whereas 6-month exercise training is likely to improve cognitive measures, leading to a Level B recommendation that clinicians recommend regular exercise to patients with MCI.

0:46:35Max Lugaveresupportedhigh

The SPRINT MIND trial found that intensive pharmaceutical lowering of high blood pressure produced a significant risk reduction for mild cognitive impairment.

"it was called the SPRINT MIND trial, that found that for people with high blood pressure that were treated with a pharmaceutical to lower their blood pressure, they saw a significant and robust risk reduction for the development of mild cognitive impairment, which is pre-dementia, essentially." (said at 0:46:35)

The SPRINT MIND randomized controlled trial evaluated the effect of intensive blood pressure control (systolic target <120 mm Hg) versus standard control (systolic target <140 mm Hg) in 9,361 adults aged 50 and older with hypertension. Intensive blood pressure lowering resulted in a statistically significant 19% relative risk reduction in adjudicated mild cognitive impairment (14.6 vs. 18.3 cases per 1,000 person-years; hazard ratio 0.81, 95% CI 0.69-0.95).

0:47:15Max Lugaveresupportedlow

A study found that using antiseptic mouthwash twice daily doubles a person's risk of developing hypertension.

"But there was a startling study that found that for people who frequently use antiseptic mouthwash—I'm talking about two times a day, every day—that they saw a doubling of their risk for hypertension." (said at 0:47:15)

The speaker accurately describes a 2020 longitudinal cohort study from the San Juan Overweight Adults Longitudinal Study (SOALS). In 540 overweight or obese individuals followed for 3 years, individuals using over-the-counter mouthwash twice daily or more had a more than twofold increased risk of developing hypertension compared to non-users (IRR = 2.17, 95% CI: 1.27–3.71) and an 85% increased risk compared to less frequent users (IRR = 1.85, 95% CI: 1.17–2.94). The biological mechanism is hypothesized to involve the eradication of oral nitrate-reducing bacteria necessary for systemic nitric oxide production. Because evidence comes from an observational cohort of overweight/obese adults relying in part on self-reported diagnoses, certainty is low.

0:50:04David Perlmutter (host)supportedlow

A study of approximately six million patient records found that users of sildenafil had an approximately 69% reduced risk of Alzheimer's disease.

"It looked at medical records of about six million individuals and determined that men who—mostly men, but people, mostly men who take sildenafil which is a Viagra, a drug that increases the function of nitric oxide, had about a 69% reduced risk of Alzheimer's" (said at 0:50:04)

The speaker accurately summarizes the findings of a 2021 study by Fang and colleagues published in Nature Aging. Analyzing insurance claims data from over 7.2 million individuals, the investigators reported that sildenafil use was associated with a 69% reduced risk of Alzheimer's disease (hazard ratio 0.31, 95% CI 0.25–0.39). Because this was a retrospective observational analysis of claims data, it identifies an association rather than proving causality.

0:51:03David Perlmutter (host)supportedvery low

Elevated uric acid damages vascular function by inhibiting nitric oxide production.

"One of the ways that uric acid does so much damage when it's elevated is it inhibits nitric oxide. That increases blood pressure, decreases blood flow, and also decreases how insulin is able to do its job" (said at 0:51:03)

The host's claim accurately describes established pathophysiological mechanisms. Preclinical and cell culture studies demonstrate that elevated uric acid (hyperuricemia) impairs endothelial nitric oxide synthase (eNOS) activation and nitric oxide (NO) production, impairing insulin-mediated vasodilation and leading to vascular insulin resistance and elevated blood pressure. Because the underlying mechanistic evidence is primarily derived from in vitro cell cultures and animal models, the overall GRADE certainty is very low.

0:53:37Max Lugaveresupportedmoderate

Using antiseptic mouthwash immediately after a workout negates the blood pressure-lowering effects of exercise.

"a study found that people who used antiseptic mouthwash immediately after a workout negated all of the antihypertensive effects of that workout because oral bacteria also recycle nitric oxide." (said at 0:53:37)

A randomized, double-blind, crossover trial in 23 healthy adults evaluated the impact of using an antibacterial (chlorhexidine) mouthwash following moderate-intensity treadmill exercise compared to a placebo rinse. In the placebo group, systolic blood pressure significantly decreased post-exercise (by 5.2 mmHg at 1 hour and 3.8 mmHg at 2 hours), accompanied by an increase in circulatory nitrite. When participants rinsed with antibacterial mouthwash, the blood pressure reduction was attenuated by 61% at 1 hour and fully negated at 2 hours post-exercise, alongside a blunted increase in circulating nitrite. This demonstrates that oral commensal bacteria, which reduce nitrate to nitrite, play an essential role in mediating acute post-exercise hypotension.

0:55:07David Perlmutter (host)supportedhigh

Sublingual nitroglycerin rapidly dilates coronary arteries to treat acute angina.

"think about what people with angina take when they're suddenly getting chest pain: they pop a sublingual nitroglycerin, and that immediately dilates their coronary arteries, and hopefully their chest pain goes away." (said at 0:55:07)

Sublingual nitroglycerin is a standard first-line treatment used for the rapid alleviation of acute angina episodes. It acts quickly by inducing systemic vasodilation (reducing myocardial oxygen demand via decreased preload and afterload) and dilating epicardial coronary arteries to improve myocardial perfusion and relieve ischemic chest pain.

  • supports: Role of short-acting nitroglycerin in the management of ischemic heart disease. (Drug design, development and therapy 2015) · cited 65x in the literature
    "Nitrates predominantly induce vasodilation in large capacitance blood vessels, increase epicardial coronary arterial diameter and coronary collateral blood flow, and impair platelet aggregation... Short-acting nitroglycerin, administered either as a sublingual tablet or spray, can complement anti-anginal therapy as part of optimal medical therapy in patients with refractory and recurrent angina either with or without myocardial revascularization, and is most commonly used to provide rapid therapeutic relief of acute recurrent angina attacks." (abstract, results)
    pubmedfull study (doi)
  • supports: Drug Therapy for Stable Angina Pectoris. (Drugs 2017) · cited 41x in the literature
    "Chronic stable angina pectoris refers to the predictable, reproducible occurrence of pressure or a choking sensation in the chest or adjacent areas caused by myocardial ischemia in association with physical or emotional stress, and cessation of exertion and or sublingual nitroglycerin invariably relieves the discomfort." (abstract, results, passage verified)
    pubmedfull study (doi)
0:58:44Max Lugaveresupportedmoderate

Eating while distracted increases food intake by approximately 15%.

"And also studies show that distracted eating, eating while distracted, whether it's with your smartphone, a magazine, or, yes, the TV, leads to an increase by about 15% in—" (said at 0:58:44)

The claim that eating while distracted (such as watching television, using a smartphone, or reading) increases food intake by approximately 15% is supported by meta-analytic evidence, particularly when looking at passive distractors and memory-mediated effects on intake. Robinson et al. (2013) conducted a systematic review and meta-analysis of experimental studies evaluating cognitive processes and eating, finding that distraction during a meal produced a moderate increase in concurrent food intake (SMD = 0.39) and a substantial increase in subsequent meal intake (SMD = 0.76). More recent updated meta-analyses show that passive distractors like television or screen viewing consistently increase meal intake, with effect estimates aligning with a modest percentage increase (~10–15%).

0:47:15Max Lugaveresupportedhigh

Oral bacteria reduce dietary inorganic nitrates found in vegetables like beets and arugula into nitrites, which subsequently enter the nitric oxide pathway to promote vasodilation.

"oral bacteria reduce the nitrate to nitrite. They convert nitrates in fruits and vegetables into compounds called nitrites, which then enter the nitric oxide pathway, which helps reduce blood pressure and increase blood flow all throughout our bodies." (said at 0:47:15)

Dietary inorganic nitrate from vegetables is absorbed and concentrated in saliva, where commensal oral bacteria reduce nitrate (NO3-) to nitrite (NO2-) via bacterial nitrate reductases. Once swallowed and absorbed into the systemic circulation, nitrite is further reduced to nitric oxide (NO), promoting vasodilation, blood flow, and blood pressure reduction. Disrupting the oral microbiome (e.g., via antiseptic mouthwash) abolishes the rise in plasma nitrite and prevents these blood-pressure-lowering effects.

0:57:10David Perlmutter (host)supportedhigh

Chewing broccoli sprouts liberates the plant enzyme myrosinase, which converts glucoraphanin into bioactive sulforaphane.

"and even things like activating sulforaphane by liberating myrosinase enzyme when you're eating your broccoli sprouts, chew your food, spend some time." (said at 0:57:10)

The biochemical pathway described by the speaker is well established. In intact plant tissues such as broccoli sprouts, the glucosinolate precursor glucoraphanin and the enzyme myrosinase are stored in separate cellular compartments. Physical disruption of plant tissues (such as thorough chewing or crushing) liberates endogenous myrosinase, which hydrolyzes glucoraphanin into the bioactive isothiocyanate sulforaphane.

0:40:20Max Lugaveresupportedhigh

Dietary tryptophan provided by protein serves as a precursor molecule for the synthesis of the neurotransmitter serotonin.

"Protein provides, for example, tryptophan, which is a precursor to serotonin, which is an important neurotransmitter implicated in healthy mood and executive function." (said at 0:40:20)

Dietary protein supplies the essential amino acid tryptophan, which is the direct biosynthetic precursor for the neurotransmitter serotonin (5-hydroxytryptamine). Brain serotonin synthesis depends on plasma tryptophan availability and its transport across the blood-brain barrier, where it is converted into 5-hydroxytryptophan and subsequently serotonin, playing an established role in mood and cognitive functions.

Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.