Gil Carvalho on Cocoa Flavanols
4 episodes · 9 references · 2025–2026
- Carvalho highlights strong cardiovascular evidence for cocoa flavanols, citing a 27% reduction in cardiovascular deaths from the COSMOS trial and blood pressure reductions of ~4 points - Recommends dark chocolate (70%+ cocoa) and non-Dutch-processed cocoa to preserve flavanols, with one ounce daily as a safe adult dose - No evidence of personal consumption; cautions about heavy metal contamination in cocoa solids
Benefits
- Dark chocolate reduces blood pressure by ~4 points via polyphenol-driven nitric oxide production and blood vessel dilation - COSMOS trial showed 15% reduction in cardiovascular events and 27% reduction in cardiovascular deaths with regular cocoa flavanol supplementation - Meta-analysis of randomized trials found cocoa reduces LDL cholesterol, fasting glucose, and blood pressure
Best Practices
- Recommends at least 70% cocoa dark chocolate — the darker the better, the less sugar the better - One ounce daily of dark chocolate poses no health concern for adults, with only minor cadmium concern for children - Avoid Dutch-processed (alkalized) cocoa, which destroys the beneficial flavanols
Cautions
- Dark chocolate and cocoa powder contain the most heavy metals because heavy metals and flavanols accumulate in the same part of the cocoa bean - Dutch processing (alkalizing) reduces flavanols and antioxidants that provide cardiovascular benefits - Heavy metal exposure is a particular concern for children consuming dark chocolate regularly
“Dark chocolate can reduce blood pressure by about four points. Cocoa is rich in polyphenols which help the production of nitric oxide to dilate blood vessels.”
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“In the COSMOS trial, participants that took the supplements more regularly saw a 15% reduction in cardiovascular events and cardiovascular deaths were significantly reduced by 27%.”
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“Cocoa is very high in antioxidants called flavanols. A metaanalysis of randomized trials found that cocoa reduces LDL cholesterol, fasting glucose, and blood pressure.”
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“Over 70% cocoa is a good kind of rule of thumb. The more cocoa the better, and the less sugar, the better.”
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“One ounce daily of dark chocolate poses no health concern for adults, with only minor concern for cadmium in children.”
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“In general, the darker the chocolate, the better. Try to shoot for at least 70% cocoa.”
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“You want these products to not be Dutch processed. Sometimes they'll process cocoa with alkali to make it less bitter, but it destroys a lot of these flavanols.”
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