Comment

"The [Joint WHO/FAO Expert] Consultation recognized that a population goal for free sugars of less than 10% of total energy is controversial [with respect of the prevention of obesity]. However, the Consultation considered that the studies showing no effect of free sugars on excess weight have limitations."

Source & © WHODiet, Nutrition and the prevention of chronic diseases (2003) 
Chapter 5 Population nutrient intake goals for preventing diet-related chronic diseases, 5.1.3 A summary of population nutrient intake goals, Free sugars

See also:
Comments on the draft report of the joint WHO/FAO expert consultation on diet, nutrition and the prevention of chronic diseases www.who.int/dietphysicalactivity/publications/