Nutrition
Dr. Michael Greger
- 71% Trust Score
- 754 claims analyzed
- 2.3 followers
- 380 verified · 345 questionable · 27 debunked
Is Dr. Michael Greger trustworthy?
Dr. Michael Greger has a Verify Influencers Trust Score of 71 out of 100, which we classify as generally reliable. Of the 754 health claims we analyzed, 380 are verified by peer-reviewed research, 345 are questionable, and 27 are debunked.
Dr. Michael Greger's most repeated claims
- Questionable (40/100) — Limit hibiscus tea intake to no more than one quart per day for adults to avoid excessive manganese and aluminum exposure. (Nutrition & Diet) source
- Questionable (49/100) — A single 15-minute session in a 200-degree Fahrenheit dry sauna can force out approximately 40 to 100 micrograms of lead from the body through sweat. (Cold & Heat Therapy) source
- Questionable (64/100) — Drinking two cups of strong hibiscus tea (using 5 tea bags total) every morning is as effective as 25mg of Captopril twice daily for lowering blood pressure. (Cardiovascular Health) source
- Verified (75/100) — Saffron at a dose of 30 mg per day has been found to work as effectively as the antidepressant drug Prozac (fluoxetine) for clinical depression without the side effect of sexual dysfunction. (Mental Health & Cognitive) source
- Questionable (53/100) — To maximize autophagy (cellular cleanup), one must engage in at least 60 minutes of moderate-intensity exercise; 20 minutes is insufficient to move the needle. (Exercise & Fitness) source
- Questionable (44/100) — Restricting protein intake to the recommended 0.8 grams per kilogram of healthy body weight (about 0.36g per pound) is the only intervention found to block all 11 identified aging pathways. (Longevity & Anti-aging) source
- Verified (81/100) — Ideal blood pressure for longevity is 110/70 mmHg; levels commonly considered 'normal' (like 120/80) may still be associated with increased risk. (Cardiovascular Health) source
- Verified (70/100) — Consume 1/4 teaspoon of ground turmeric daily to provide anti-inflammatory benefits, but avoid high-dose turmeric extracts which have been linked to liver toxicity. (Supplements & Compounds) source
- Verified (72/100) — Consume 1/4 teaspoon of ground black cumin (Nigella sativa) daily to significantly improve cholesterol, triglycerides, blood pressure, and blood sugar control, while accelerating body fat loss. (Supplements & Compounds) source
- Verified (81/100) — Rinse your mouth with water after drinking hibiscus tea to protect dental enamel from its high acidity. (Nutrition & Diet) source
Verified claims
- Verified (75/100) — Saffron at a dose of 30 mg per day has been found to work as effectively as the antidepressant drug Prozac (fluoxetine) for clinical depression without the side effect of sexual dysfunction. (Mental Health & Cognitive) source
- Verified (81/100) — Ideal blood pressure for longevity is 110/70 mmHg; levels commonly considered 'normal' (like 120/80) may still be associated with increased risk. (Cardiovascular Health) source
- Verified (70/100) — Consume 1/4 teaspoon of ground turmeric daily to provide anti-inflammatory benefits, but avoid high-dose turmeric extracts which have been linked to liver toxicity. (Supplements & Compounds) source
- Verified (72/100) — Consume 1/4 teaspoon of ground black cumin (Nigella sativa) daily to significantly improve cholesterol, triglycerides, blood pressure, and blood sugar control, while accelerating body fat loss. (Supplements & Compounds) source
- Verified (81/100) — Rinse your mouth with water after drinking hibiscus tea to protect dental enamel from its high acidity. (Nutrition & Diet) source
Debunked claims
- Debunked (33/100) — Pistachios are the most melatonin-rich food ever recorded; eating just two pistachios provides a physiological dose of 0.3 micrograms of melatonin. (Nutrition & Diet) source
- Debunked (23/100) — A quarter teaspoon of ground lettuce seeds taken daily for two weeks can significantly improve sleep quality in pregnant women with insomnia. (Women's Health) source
- Debunked (35/100) — Soy intake is associated with a 73 percent breast cancer risk reduction in carriers of BRCA gene mutations. (Nutrition & Diet) source
- Debunked (29/100) — A half-teaspoon of seaweed powder daily can reduce endometriosis pain by 85 percent and nearly double the length of an abnormally short menstrual cycle. (Women's Health) source
- Debunked (19/100) — A quarter-teaspoon of dried, powdered bladderwrack seaweed daily can reduce endometriosis pain by 75 percent. (Women's Health) source
Frequently asked questions
- What is Dr. Michael Greger's trust score?
- Dr. Michael Greger has a Verify Influencers trust score of 71 out of 100, based on analysis of 754 health claims against peer-reviewed scientific research.
- Is Dr. Michael Greger trustworthy for health advice?
- Dr. Michael Greger has a Verify Influencers Trust Score of 71 out of 100, which we classify as generally reliable. Of the 754 health claims we analyzed, 380 are verified by peer-reviewed research, 345 are questionable, and 27 are debunked.
- How many claims has Dr. Michael Greger made?
- We have analyzed 754 health claims from Dr. Michael Greger across YouTube, social media, podcasts, and their website.
Scores follow a fixed rubric and are re-checked on a rolling cycle. How we score and how to request a correction. Last updated 2026-05-17.
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