â¢ Lychee average yields range from 600 pounds per acre in an âoffâ year to 10,000 pounds per acre in a heavy-bearing year (economic average is 5,000 pounds per acre). With a pack-out of 70 percent and a price of $3 per pound, income from an acre of lychee averages approximately $10,000 (3).
Generally foods contain complex mixtures of polyphenols. According to a 2005 review on polyphenols: The most important food sources are commodities widely consumed in large quantities such as fruit and vegetables, green tea, black tea, red wine, coffee, chocolate, olives, and extra virgin olive oil.
Another class of antioxidant polyphenols in grapes are called flavonols. Grapes contain the flavonols quercetin, also in apples, and kaempferol, also in broccoli, which are thought to reduce cellular proliferation and cancer.ince most of the antioxidants are found in the seed and skin of the grape â 80% unless the flesh is darker and has more antioxidants, a juiceâs or wineâs antioxidant content will be higher if it includes the seeds and skin. This is why red wine contains eight to ten times the polyphenol content as white wine.