Lettuce is comprised of a whopping 95% water content, making it the ideal green for hydrating, with romaine taking the lead as the most hydrating. In order to reap the optimal benefits stick to the leafy green outer leaves where there's a higher water count. A study that appeared in the Journal of Food Science found that heads of butter lettuce stored post-harvest contained the most water content in the outer section of the leaves, but that the water faded more quickly on the outer leaves than the internal, more sturdy leaves. So it's best to eat the outer leaves within a day or two of purchasing when the water content is at its highest.
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