#028 Sulforaphane and Its Effects on Cancer, Mortality, Aging, Brain and Behavior, Heart Disease & More
Dr. Rhonda Patrick discusses the NRF2 pathway and sulforaphane, a potent compound from cruciferous vegetables, especially broccoli sprouts. She covers its roles in cancer prevention, cardiovascular health, anti-aging, neuroprotection, and inflammation reduction, emphasizing its accessibility through home sprouting.
Deep Dive Analysis
13 Topic Outline
Introduction to Cruciferous Vegetables and Sulforaphane
Cruciferous Vegetable Consumption and All-Cause Mortality
Sulforaphane's Cancer-Preventative Properties and Mechanisms
Broccoli Sprouts as the Best Source of Sulforaphane
Sulforaphane's Role in Carcinogen Detoxification and Excretion
Impact of Sulforaphane on Air Pollution Carcinogen Excretion
Cruciferous Vegetables and Cardiovascular Disease Risk Factors
Sulforaphane's Potential to Slow Aging and Reduce Inflammation
Sulforaphane's Effects on Brain Health: Autism, Schizophrenia, Depression
Sulforaphane and Neurodegenerative Diseases & Traumatic Brain Injury
Sulforaphane's Early Promise in Duchenne Muscular Dystrophy
Bioavailability, Dosing, and Maximizing Sulforaphane Production
Addressing Concerns About Isothiocyanate Goitrogenic Activity
9 Key Concepts
NRF2 Pathway
A genetic pathway that controls over 200 genes, many of which are antioxidant, anti-inflammatory, and involved in inactivating potentially harmful compounds. Sulforaphane is the most potent naturally occurring dietary activator of this pathway.
Isothiocyanates
Compounds produced from glucosinolates by an enzyme called myrosinase when cruciferous plants are chopped, crushed, or chewed. Sulforaphane is a prominent and potent example of an isothiocyanate.
Glucoraphanin
The glucosinolate precursor from which sulforaphane is made. It is often referred to as sulforaphane glucosinolate and is found in high concentrations in broccoli sprouts.
Myrosinase
An enzyme that becomes activated when cruciferous plant matter is crushed or chewed, converting glucosinolates (like glucoraphanin) into isothiocyanates (like sulforaphane). This enzyme is heat-sensitive.
Phase One Biotransformation Enzymes
A family of enzymes responsible for converting potential pro-carcinogens into active carcinogens. Sulforaphane works to inactivate these enzymes, thereby preventing the formation of DNA adducts.
Phase Two Detoxification Enzymes
Enzymes, such as glutathione S-transferase, that are activated by isothiocyanates (via NRF2) to transform pro-carcinogenic agents into water-soluble compounds that can be excreted from the body. They also reduce DNA damage by lowering inflammation and reactive oxygen species.
DNA Adducts
A type of DNA damage that forms after exposure to a carcinogen and has been shown to lead to cancer. Sulforaphane helps prevent their formation by inactivating phase one biotransformation enzymes.
Immunosenescence
The functional decline of the adaptive immune system with age, which makes individuals more susceptible to infection. Mouse studies suggest sulforaphane may help restore some of this lost immune function.
Epithiospecifier Protein
A protein found in cruciferous vegetables that actually prevents the formation of sulforaphane. Light steaming or specific heating methods can deactivate this protein while preserving myrosinase, thus maximizing sulforaphane production.
12 Questions Answered
The top 20% of cruciferous vegetable consumers have a 22% reduction in all-cause mortality, primarily due to a reduced risk of death from cardiovascular disease.
Sulforaphane prevents cancer by inactivating phase one biotransformation enzymes that convert pro-carcinogens into carcinogens, activating phase two detoxification enzymes to excrete harmful compounds, and protecting tumor suppressor genes like P53.
Broccoli sprouts are the single best source of glucoraphanin, the precursor to sulforaphane, containing up to 100 times more than mature broccoli.
Yes, sulforaphane significantly increases the excretion rate of carcinogens like benzene (by 61%) and acrolein (by 23%) by activating the NRF2 pathway and phase two detoxification enzymes.
People who eat more cruciferous vegetables have a lower risk of cardiovascular disease, heart attack, and stroke. Sulforaphane supplementation can lower serum triglycerides, oxidized LDL, and improve the atherogenic index.
While not directly studied in humans for lifespan, sulforaphane activates NRF2 and the FOXO pathway (linked to human longevity), reduces inflammation, and protects cells from damage, all of which are believed to slow cellular aging.
In humans, sulforaphane has been shown to improve autistic behavior checklist scores by 34% and significantly improve social interaction, abnormal behavior, and verbal communication in young men with autism spectrum disorder. It also improved cognitive impairment scores in a small trial of schizophrenia patients.
Animal studies show sulforaphane can reverse depressive symptoms induced by inflammation or various stressors, reducing stress hormones and inflammatory responses. Its ability to cross the blood-brain barrier and lower inflammatory markers in humans suggests potential for depression.
In animal models, sulforaphane has improved memory in Alzheimer's-like disease, normalized dopamine in Parkinson's, cleared aggregates in Huntington's, and protected against traumatic brain injury by reducing inflammation, oxidative stress, and promoting neuronal repair.
Effective doses in studies range from 9-60 milligrams of sulforaphane per day, which can be obtained from approximately 43 to 140 grams of fresh broccoli sprouts. Home sprouting is a cheap and accessible way to produce these amounts.
To maximize sulforaphane, lightly steam cruciferous vegetables for 3-4 minutes, or heat mature broccoli to 60°C for 10 minutes, or broccoli sprouts to 70°C for 10 minutes. This deactivates epithiospecifier protein while preserving myrosinase.
While some studies indicate isothiocyanates can compete with iodine for thyroid transport, most evidence suggests this is only a problem under severe iodine deficiency. Healthy people consuming amounts equivalent to 70 grams of broccoli sprouts showed no negative effects on thyroid hormones or liver toxicity.
32 Actionable Insights
1. Prioritize Cruciferous Vegetables
Prioritize the consumption of cruciferous vegetables, as the top 20% of consumers saw a 22% reduction in all-cause mortality, a more substantial effect than general vegetable consumption.
2. Consume Broccoli Sprouts Regularly
Incorporate broccoli sprouts into your diet as they are the single best source of glucoraphanin, containing up to 100 times more than mature broccoli, which is a precursor to potent sulforaphane.
3. Sprout Broccoli at Home
Produce broccoli sprouts cheaply at home in bulk using around six glass jars and sprouting seeds in continuous rotation to yield about eight ounces daily, making it accessible and sustainable for months with minimal cost.
4. Prepare Cruciferous Properly
To maximize beneficial isothiocyanates, chop, crush, or chew cruciferous vegetables, and avoid prolonged high temperatures like sustained boiling, which deactivates the necessary enzyme myrosinase.
5. Lightly Steam Cruciferous Vegetables
Lightly steam cruciferous vegetables for three to four minutes to deactivate epithiospecifer protein, which inhibits sulforaphane formation, while keeping myrosinase active for optimal conversion.
6. Heat Broccoli to Optimal Temps
To maximize sulforaphane production, heat mature broccoli to 60°C for 10 minutes, or broccoli sprouts to 70°C for 10 minutes, which can increase sulforaphane production by 3.5 fold.
7. Combine Glucoraphanin with Myrosinase
If supplementing with glucoraphanin, consume it alongside cruciferous vegetables containing myrosinase (like broccoli sprouts) or mustard seed to significantly increase sulforaphane absorption.
8. Be Cautious with Supplements
Be cautious with sulforaphane supplements that contain only glucoraphanin (sulforaphane glucosinolate) without the necessary myrosinase enzyme for conversion, as this may limit their effectiveness.
9. Increase Overall Vegetable Intake
Increase your overall vegetable consumption, as those in the top 20% of vegetable consumers experienced a 16% reduction in all-cause mortality.
10. Target 60mg Sulforaphane Daily
To achieve a daily dose of 60 milligrams of sulforaphane, which significantly impacted prostate cancer markers, consume approximately 140 grams of fresh broccoli sprouts.
11. Target 40mg Sulforaphane for Heart
To mimic benefits seen in type 2 diabetics (reduced triglycerides and oxidized LDL), aim for a daily dose of 40 milligrams of sulforaphane, equivalent to about 100 grams of fresh broccoli sprouts.
12. Target 40mg Sulforaphane for Inflammation
For general inflammation reduction, aim for 40 milligrams of sulforaphane daily, which has been shown to reduce TNF-alpha by 11% and C-reactive protein by 16%.
13. Consume 135g Sprouts for Benzene
Consume approximately 135 grams of fresh broccoli sprouts daily (or a beverage with 262.5 mg glucoraphanin and 7.1 mg sulforaphane) to increase benzene excretion by 61%.
14. Consume 27mg Sulforaphane for Carcinogens
Consume a broccoli sprout beverage containing 27 milligrams of sulforaphane to achieve a 50% increase in the excretion of carcinogens like acrolein, crotonaldehyde, ethylene oxide, and benzene.
15. Consume 85g Sprouts for Breast Tissue
Consume approximately 85 grams of fresh broccoli sprouts (yielding about 37 mg sulforaphane) to promote the accumulation of sulforaphane in breast tissue, which may offer protective functions.
16. Consume 43g Sprouts for Immunity
Consume approximately 43 grams of fresh broccoli sprouts daily (equivalent to 20 mg sulforaphane) to potentially support the regaining of adaptive immune function, based on human-equivalent doses from mouse studies.
17. Autism: Consume 65g Sprouts Daily
Young men with autism spectrum disorder may benefit from consuming up to 65 grams of fresh broccoli sprouts daily (yielding 9-25 mg sulforaphane) to improve autistic behavior checklist scores, social interaction, abnormal behavior, and verbal communication.
18. Schizophrenia: 30mg Glucoraphanin Daily
Medicated patients with schizophrenia may consider supplementing with 30 milligrams of glucoraphanin daily for eight weeks to potentially improve certain scores of cognitive impairment.
19. Consume 14g Cruciferous/kg Daily
Healthy individuals can decrease circulating IL-6 levels by 20% by consuming 14 grams of cruciferous vegetables per kilogram of body weight daily.
20. Men: 3-5 Servings Cruciferous Weekly
Men should aim to eat between three to five servings of cruciferous vegetables per week to potentially decrease prostate cancer risk by 40%.
21. Men: 2+ Half-Cup Broccoli Weekly
Men should consume two or more half-cup servings of broccoli per week to potentially achieve a 44% lower incidence of bladder cancer.
22. Smokers: Eat Raw Cruciferous
Smokers should consume at least four and a half servings of raw cruciferous vegetables per month to potentially reduce lung cancer risk by 55%.
23. Women: Eat Cruciferous Weekly
Women should consume cruciferous vegetables at least once a week to potentially decrease breast cancer risk by 17% to 50%.
24. Bladder Cancer: Eat Raw Broccoli
Individuals with bladder cancer should aim for at least four servings of raw broccoli per month to potentially reduce bladder cancer mortality by 57% and all-cause mortality by 43%.
25. Eat 300g Brussels Sprouts Daily
Consume 300 grams of Brussels sprouts daily to potentially increase glutathione S-transferase by 1.4 fold and reduce oxidative DNA damage by 28%.
26. Smokers: Eat Watercress with Meals
Smokers should eat 57 grams of watercress with each meal for three days to increase the excretion of biomarkers indicating inactivation of the tobacco-specific carcinogen NNK by 35%.
27. Home Sprouting for Two People
When home sprouting with the mason jar method, use six jars in continuous rotation to yield enough broccoli sprouts (approx. 280g/jar) to provide 60 milligrams of sulforaphane daily for two people.
28. Eat Cabbage Crude or Cooked
Consume cabbage crude with vinegar or cooked with oil or fat, as historically suggested, for its potential health benefits.
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3 Key Quotes
That cabbage, eaten crude with vinegar or cooked with oil or fat, banishes and cures all, from crapulence after exceeding too much wine or all the way up to serious diseases like cancer.
Cato the Elder
Slowing the rate at which a tumor marker is increased in a clinical trial by 86%, that's pretty gigantic.
Dr. Rhonda Patrick
If they are anti-nutrients, they are my favorite anti-nutrients.
Dr. Rhonda Patrick
2 Protocols
Home Broccoli Sprouting for Sulforaphane Production
Dr. Rhonda Patrick- Acquire around six glass jars and sprouting seeds.
- Maintain continuous rotation of the jars for sprouting.
- Yield approximately eight ounces of fresh broccoli sprouts every day.
Maximizing Sulforaphane Production from Cruciferous Vegetables (Cooking Method)
Dr. Rhonda Patrick- Lightly steam cruciferous vegetables for three to four minutes.
- Alternatively, heat mature broccoli to 60 degrees Celsius for 10 minutes.
- Alternatively, heat broccoli sprouts to around 70 degrees Celsius for 10 minutes.