It is a common staple across the world, but too much sugar in people's diets has been blamed for causing diabetes, tooth decay and even dementia.
The sugar industry says it is not harmful to consume the staple in moderation. However, some researchers say the manufacturers are trying to mislead consumers by not giving an official definition of moderation.
Some campaigners are calling for stricter controls on the sweet substance that would be similar to those placed on the tobacco trade.
Al Jazeera's Brian Rooney reports from California.