Daily grape consumption may help alleviate pain associated with symptomatic osteoarthritis of the knee and improve joint flexibility and overall mobility, a research said.This is possible because of polyphenols (antioxidants) found in grapes."Our findings provide promising data that links grape consumption to two very important outcomes for those living with knee osteoarthritis: reduced pain and improvements in joint flexibility," said Shanil Juma from Texas Woman's University, US.