An article noted that chocolate is rich in flavonoids. the article reports that "regular consumption of foods rich in flavonoids may reduce the risk of coronary heart disease." the study received funding from a candy company and a chocolate manufacturers association. identify and explain at least one source of bias in the study described. then suggest how the bias might have been avoided.

since ancient times, chocolate has long been used as a medicinal remedy and been proposed in medicine today for preventing various chronic diseases, while chocolates has also sometimes been criticized for its saturated fat contant, mostly in the form of long-chain stearic acid, chocolate has also been lauded for its antioxidant potential. However to this date there are no long-term randomized feeding trials of chocolate to assess effects on actual cardiovascular events.