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Evidence-minded articles on the nutrition and health benefits of everyday ingredients — vegetables, fruits, seafood, spices and more.

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All ingredients | Ingredient Health Benefits

All ingredients

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Evidence

All Moderate evidence6 Early research2

6 ingredients

Tea & drinks — See the category page

Tea & drinks

Moderate evidence

Chamomile tea

A meta-analysis of 12 randomised trials. Sleep quality improved significantly. Only one trial looked at insomnia, and in that one nothing changed.

Tea & drinks

Moderate evidence

Cocoa

A Cochrane review pooled 35 randomised trials and 1,804 people. Systolic fell 1.76 mmHg. In people with normal blood pressure, there was no significant difference.

Tea & drinks

Moderate evidence

Hibiscus tea

Across 26 randomised trials and 1,797 participants, blood pressure fell dose-dependently. The claim that it matches antihypertensive drugs is not what the data support.

Tea & drinks

Moderate evidence

Black tea

Across 13 randomised trials, systolic blood pressure fell 1.04 mmHg. Statistically significant, and too small for one person to feel.

Tea & drinks

Moderate evidence

Coffee

The association with lower type 2 diabetes and liver disease risk is consistent. The interesting part is that decaf shows almost the same thing.

Tea & drinks

Moderate evidence

Green tea

Catechins and L-theanine keep showing up in cardiovascular and attention research. What decides the result is your water temperature and when you drink it.