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.
The top 100 richest foods in polyphenols has been studied and a list was published, but the top 10 are: 1  Cloves. 2  Star anise. 3  Cocoa powder. 4  Mexican oregano, dried. 5  Celery seed. 6  Black chokeberry. 7  Dark chocolate. 8  Flaxseed meal. 9  Black elderberry. 10  Chestnut.