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One cup of cocoa can prevent heart arteries closing?---best time to drink it

The bold claim
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The bold claim
Cocoa can improve artery function within 2 hours—high-flavanol cocoa sparks a nitric oxide surge that makes blood vessels relax and respond better, fast.
What’s doing the magic
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What’s doing the magic
Cocoa flavanols (like epicatechin) activate endothelial nitric oxide synthase, raising nitric oxide so arteries dilate more easily and blood flow improves measurably.
What “measurable” looks like
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What “measurable” looks like
Studies detect acute bumps in flow-mediated dilation after a single serving—meaning more flexible, responsive vessels in the short window after drinking cocoa.
How to actually get the effect
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How to actually get the effect
Choose “high-flavanol” cocoa or very dark chocolate (85%+), brew with hot water or plant milk, and avoid adding heavy dairy, which can reduce flavanol bioavailability.
Timing that works
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Timing that works
Use 1–2 hours before a workout, a long walk, or an evening when alertness and circulation matter—this lines up with peak vascular responsiveness.
Dose and pairings
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Dose and pairings
Aim for 500–700mg cocoa flavanols (often ~2–2.5 tbsp high-flavanol cocoa powder); add citrus (vitamin C) or a pinch of cinnamon to support antioxidant stability and smooth glucose response.
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