Free sugar is defined by the World Health Organization and the US Food and Agriculture Organization in multiple reports  as "all monosaccharides and disaccharides added to foods by the manufacturer, cook, or consumer, plus sugars naturally present in honey, syrups, and fruit juices". It is used to distinguish between the sugars that are naturally present in fully unrefined carbohydrates such as brown rice, wholewheat pasta, fruit, etc. and those sugars (or carbohydrates) that have been, to some extent, refined (normally by humans but sometimes by animals, such as the free sugars present in honey). They are referred to as "sugars" since they cover multiple chemical forms, including sucrose, glucose, fructose, dextrose, etc.
The principal definition of free sugars was to split the term "carbohydrate" into elements that relate more directly to the impact on health rather than a chemical definition, and followed on from meta-studies relating to chronic disease, obesity, and dental decay. It also led to the WHO and FAO to publish a revised food pyramid that splits up the classic food groups into more health-directed groups, which appears, as yet, to have had little impact on the food pyramids in use around the World. The inclusion of such a definition caused issues for the WHO with sugar companies, who attempted to get the US government to remove funding from the WHO for suggesting that consumption of free sugars within the food pyramid should only amount to a maximum of 10% of the total energy intake, and that there should be no minimum (i.e. there is no requirement for any free sugars in the human diet) on the basis that the report did not take into account the evidence supplied by the sugar industry. The report in question specifically includes references to the evidence but was unable to use it for a health basis because the way the studies were set up did not offer effective evidence of an impact on health, and referred to such studies as "limited".
- Joint WHO/FAO Expert Consultation, 2003, "WHO Technical Report Series 916 Diet, Nutrition, and the Prevention of Chronic Diseases", Geneva
- Diet, nutrition and the prevention of dental diseases, Public Health Nutrition: 7(1A), 201–226
- "Sugar industry threatens to scupper WHO", Sarah Boseley, health editor, The Guardian, Monday 21 April 2003
- "Sugar Industry Takes on the World Health Organization", John Ydstie and Marion Nestle (Chair of the Nutrition and Food Studies Department at New York University, Author of Food Politics: How the Food Industry Influences Nutrition and Health (University of California Press, 2002)), NPR, April 24, 2003
- "Political context of the World Health Organization: sugar industry threatens to scupper the WHO", Boseley S., Int J Health Serv. 2003;33(4):831-3
- "Sugar industry sour on WHO report", Barbara Sibbald, CMAJ. 2003 June 10; 168(12): 1585.
- Joint WHO/FAO Expert Consultation, 2003, "WHO Technical Report Series 916 Diet, Nutrition and the Prevention of Chronic Diseases", Geneva