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Michael Greger, M.D., is a physician, author, and internationally recognized professional speaker on a number of important public health issues.

Blog Entries by Michael Greger MD

Latest Science on Rooibos & Nettle Tea

Michael Greger MD | September 5, 13 at 05:00 AM | Health

Read More: calcium, chamomile tea, copper, estrogen, green tea, hibiscus, iron, magnesium, minerals, mint tea, nettle tea, phytonutrients, prostate enlargement, red tea, rooibos, sage, St. John's Wort, steroid hormones, steroids, zinc

Rooibos, or red tea, is anecdotally reported to aid stress-related symptoms, but it has none of the mood-altering phytonutrients thought responsible for the increased calm and decreased stress after drinking green tea (see Dietary Brain Wave Alteration). So why...

Hibiscus Tea: The Best Beverage?

Michael Greger MD | September 3, 13 at 05:00 AM | Health

Read More: amla, antioxidants, berries, chamomile, dementia, depression, erythritol, flor de Jamaica, flowers, goji, green tea, herbal, hibiscus, matcha, mint, oxidant stress, phytonutrients, plant-based diet, PMS, rose bush, roselle, saffron crocus, sorrel, stress, tea, vegan, vegetarian, zinger tea

A landmark investigation of the Antioxidant Content of 3,139 Foods put all previous rankings to shame. That's where I got the data to create my videos Best Berries, which compares hundreds of berries to common fruits, and Better Than...

Treating Parkinson's Disease With Diet

Michael Greger MD | August 30, 13 at 05:00 AM | Health

Read More: animal protein, beef, berries, bioaccumulation, brown rice, caffeine, cancer, cheese, chicken, cholesterol, coffee, dairy, dopamine, fisetin, fish, Istradefylline, L-dopa, levodopa, meat, milk, N-hexacosanol, Parkinson's, phytonutrients, plant-based diet, pollutants, Preladenant, protein redistribution diet, serotonin, strawberries, vegan, vegetarian, whole wheat, yogurt

Caffeine consumption appears to help prevent Parkinson's, but what if you already have the condition? A recent study found that giving folks the equivalent of about two cups of coffee a day worth of caffeine significantly improved symptoms of...

Avoiding Dairy to Prevent Parkinson's

Michael Greger MD | August 27, 13 at 05:00 AM | Health

Read More: brain damage, cheese, chemicals, concussions, dairy, exercise, head damage, hormones, industrial carcinogens, industrial pollutants, milk, Monsanto, neurotoxic chemicals, Parkinson's, PCBs, pesticides, plant-based diet, pollutants, Polychlorinated biphenyl, Tetrahydroisoquinoline, vegan, vegetarian, yogurt

There are four things that may reduce our risk of developing Parkinson's disease: increase exercise, and avoid dairy products, pesticides, and head trauma (please wear your seatbelt and bike helmet!). What about avoiding pesticides and other industrial pollutants? A...

NutritionFacts.org Video Hits a Million Views

Michael Greger MD | August 22, 13 at 05:00 AM | Health

I'm so excited to share that my newest live presentation, More Than an Apple a Day: Preventing Our Most Common Diseases, has reached over a million views on YouTube, breaking my previous record of 800,000 for last year's Uprooting...

The Science on Acai Berries

Michael Greger MD | August 20, 13 at 05:00 AM | Health

Read More: açaí berries, acai berries, acai berry powder, and metabolic parameters, antioxidant content, antioxidants, arthritis, cancer, cholesterol, immune cell function, immune function, immune system, Indian gooseberries, insulin, metabolic parameters, metabolism, Natural Standards Research Collaboration, NSRC, obesity, osteoarthritis, pain, phytonutrients, plant-based diet, pomegranate, pomegranate juice, rose hips, superfood, supplements, vegan, vegetarian, World Health Organization

An independent review of the effects of açaí berries was recently published, which included studies on immune function, arthritis, and metabolic parameters. The "Evidence-Based Systematic Review of Acai" was issued by the Natural Standards Research Collaboration (NSRC), an impartial...

Why are Children Starting Puberty Earlier?

Michael Greger MD | August 15, 13 at 05:00 AM | Health

Read More: animal protein, beef, cancer, cheese, chicken, children, dairy, diet, early onset puberty, emphysema, endocrine disrupting chemicals, fish, IGF-1, insulin-like growth factor 1, kids, meat, menstruation, obesity, plant-based diet, premature puberty, puberty, vegan, vegetarian, yogurt

Early onset of puberty is considered a risk factor for a number of diseases in adulthood, including hormone-related cancers, a shorter lifespan, metabolic syndrome, and cardiovascular disease. The conventional thinking has been that the age of puberty has been...

Should We Avoid Titanium Dioxide?

Michael Greger MD | August 13, 13 at 05:00 AM | Health

Read More: animal products, animal protein, antibiotics, arachidonic acid, bacteria, beef, carbon monoxide, chewing gums, chicken, Crohn's disease, endotoxin, estrogen, fish, heterocyclic amines, inflammatory bowel disease, intenstinal flora, intestinal inflammation, marshmallows, meat, microparticles, nanoparticles, plant-based diet, powdered sugar, processed meat, titanium dioxide, toxins, ulcerative colitis, vegan, vegetarian

Two potential risk factors that may increases the risk of inflammatory bowel diseases (such as ulcerative colitis and Crohn's disease) are animal protein and nanoparticles such as titanium dioxide. Of all dietary factors, animal protein from meat and fish...

Which Pets Improve Children's Health?

Michael Greger MD | August 6, 13 at 05:00 AM | Health

Read More: blood pressure, cancer, cats, children, children's health, dogs, ear infections, foodborne pathogens, foodborne rabies, gastroenteritis, infectious diseases, lymphoma, pets, rabies, respiratory illnesses, respiratory infections

To my surprise, studies of the effects of pets on human health and well-being have actually produced a mishmash of conflicting results. For example, some studies show pets lower your blood pressure--in some cases more than drugs do--but other...

Vitamin D from Mushrooms, Sun, or Supplements?

Michael Greger MD | August 1, 13 at 05:00 AM | Health

Read More: bioavailability, Institute of Medicine, mushrooms, sun, vitamin D, vitamin D2, vitamin D3, vitamin deficiency, vitamin recommendations, vitamin requirements, wool

Years ago, it was shown that vitamin D isn't just the sunshine vitamin for us, but for mushrooms as well. You take some mushrooms, put them under a sun lamp for an hour, and they'll make vitamin D just...

Is Coconut Oil Good For You?

Michael Greger MD | July 30, 13 at 05:00 AM | Health

Read More: Alzheimer's, Alzheimer's Association, atherosclerosis, bad cholesterol, clinical nutrition, clogged artereris, coconut oil, heart disease, LDL, medical community, medical school, saffron, saturated fat, stearic acid

Some who profit from coconut oil claim it has miraculous powers, curing everything from cancer to jock itch. The boldest claim may be that it is a potential cure for Alzheimer's, based on a series of anecdotes and one...

Do Vegans Get More Cavities?

Michael Greger MD | July 25, 13 at 05:00 AM | Health

Read More: acid erosion, American Dental Association, apples, beef, carrots, cavities, cheese, chicken, cholesterol, chronic gum disease, citrus, citrus fruit, dairy, dentist, enamel erosion, fiber, fruit, fruit juice, gingivitis, grapes, high-fiber food, impotence, leafy vegetables, meat, oral cancer, oral care, oral disease, oral health, periodontal disease, plant-based diet, raw, saturated fat, sexual dysfunction, soda, tomatoes, vegan, vegetables, vegetarian

A diet high in saturated fat, which can clog our arteries and lead to inflammation, is considered a key underlying causal factor for periodontal diseases like gingivitis. This may explain why chronic gum disease is associated with sexual dysfunction....

Head Shrinking from Grilling Meat

Michael Greger MD | July 23, 13 at 05:00 AM | Health

Read More: bacon, barbeque, BBQ, birth weight, carcinogens, chronic obstructive pulmonary disease, cooking meat, COPD, DNA, fetal development, frying meat, lung cancer, lung disease, lung health, meat fumes, mutations, newborns, polycyclic aromatic hydrocarbons, pregnant women, respiratory tract cancer, restaurants, young children

A year ago I posted a two minute video entitled Carcinogens in the Smell of Frying Bacon, in which I described the ability of the fumes generated by frying meat to mutate DNA. This helped explain both the increased...

Broccoli Boosts Liver Detox Enzymes

Michael Greger MD | July 18, 13 at 05:00 AM | Health

Read More: breast cancer, broccoli, Brussels sprouts, caffeine, carcinogens, cruciferous vegetables, detox, detoxifying enzymes, enzymes, fruits, heterocyclic amines, liver, liver health, phase II enzyme system, phytonutrients, plant-based diet, vegan, vegetables, vegetarian

Researchers just found out that the boost in detoxifying enzymes triggered by cruciferous vegetable consumption may last for weeks! Last spring in my post The Best Detox I described this amazing phenomenon in which a phytonutrient produced by broccoli...

Dr. Greger's New Year-in-Review Presentation

Michael Greger MD | July 16, 13 at 05:00 AM | Health

Read More: DVD

Watch my new live presentation online at More Than an Apple a Day or order it on DVD (all proceeds to charity). Every year I scour the world's scholarly literature on clinical nutrition, pulling together what I find to...

Dr. Greger's New DVD (all proceeds to charity)

Michael Greger MD | July 11, 13 at 05:00 AM | Health

Read More: DVD

The newest volume of my Latest in Clinical Nutrition DVD series launches today. Order on my website or through Amazon (all proceeds go to keeping NutritionFacts.org up and running). The current batch of videos from volume 13 on NutritionFacts.org...

Foods That May Block Cancer Formation

Michael Greger MD | July 9, 13 at 05:00 AM | Health

Read More: aging, antiangiogenesis, apigen, beans, berries, breast cancer, breast health, broccoli, cancer, cancer survival, celery, citrus, exercise, fisitin, flavonoids, fruit, luteolin, metastases, peppers, phytonutrients, plant-based diets, rice, spices, strawberries, tea, vegans, vegetarians, VEGF, weight loss, women's health

More than 85% of breast cancers are sporadic and attributable to long-term exposure to environmental carcinogens, such as those in the diet, through a multistep disease process progressing from non-cancerous to pre-cancerous to malignant stages. How can we interrupt...

Avoiding Cooked Meat Carcinogens

Michael Greger MD | July 4, 13 at 05:00 AM | Health

Read More: bacon, baking, barbecuing, beef, birds, boiled, breast cancer, carcinogens, cheese, chicken, cigarettes, coffee, cooked meat, creatine, diesel fumes, E. coli, eggs, estrogen, fast food, fish, frying, grilling, heterocyclic amines, incinerator ash, lung cancer, mammals, meat, nitrosamines, pancreatic cancer, PCBs, PhIP, prostate cancer, protein supplements, roasted, smoking, well cooked

When the muscles of mammals, fish, or birds are cooked at high temperatures carcinogenic chemicals called heterocyclic amines are created that may increase the risk of breast, colon, lung, pancreatic, and prostate cancer (see my last post Estrogens in...

Estrogens in Cooked Meat

Michael Greger MD | July 2, 13 at 05:00 AM | Health

Read More: animal protein, breast cancer, broccoli, cancer, cancer-producing substances, carcinogens, cooked meat, ductal carcinoma, estrogen, heterocyclic amines, IGF-1, Indian gooseberries, meat, metastatic potential, mutagens, National Cancer Institute, PhIP, three strikes, tumor, tumor growth

We've known since 1939 that there were "cancer-producing substances" in roasted meat. Scientists have since identified these compounds as heterocyclic amines, described by the National Cancer Institute as "chemicals formed when muscle meat, including beef, pork, fish, and poultry,...