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In two studies published in 2004 and 2007, researchers from Southampton University suggested that a statistically significant increase in the hyperactivity of children possibly occurs after they consumed common artificial food colours and additives from fruit drinks. The list of compounds used in the two studies included a preservative commonly used in beverages, sodium benzoate, and six color additives used in foods: tartrazine, quinoline yellow, sunset yellow, carmoisine and allura red. On the basis of the 2007 report, The UK Food Standards Agency has revised its stance on these additives, informing parents of children that demonstrate hyperactive behaviour that removal of foods containing the six additives from their diet may have beneficial results on behaviour. The European Food Safety Authority (EFSA) was asked to review the 2007 study that asserted a link between consumption of artificial food colours and the observation of hyperactive behaviour in children. EFSA invited a number of experts in behaviour, child psychiatry, allergenicity and statistical analysis to provide input to the EFSA Panel on Additives, Flavourings, Processing Aids and Materials in Contact with Food. In a press release from March 2008, EFSA indicated that, in their view, the 2007 study provided only limited evidence on the few children experimented of an association between the intake of the mixture of additives and activity and attention. Due to this, they further indicated that the effects that were reported in the study were not consistent for the two age groups and the two food additive mixtures due to the limited evidence gathered, and limited patients experimented.
Other studies who think that there is a correlation between hyperactivity and diet have recommended the Feingold Diet which eliminates several synthetic colors, synthetic flavors, synthetic preservatives, and artificial sweeteners. Scientific studies have shown mixed results in double blind studies of the diet lacking the evidence it needs to prove that this diet works. A 1983 publication in the Journal of the American Dietetic Association suggested that administration of the Feingold diet produced very minimal behavioural alterations in hyperactive children further suggesting that the diet has no effect on hyperactive kids.
The majority of studies show no connection between sugar and hyperactivity. Some people, particularly parents and teachers, believe that sugar causes hyperactivity, and that children's behavior often gets more rowdy, excited and energetic after they eat too much sugary food and drink too many sugary drinks (such as chocolates/sweets or soft drinks). One particular study found that the perception by parents regarding their children's hyperactivity depended on their belief as to whether they had been given sugar, and thus, a placebo effect was observed. Regardless of this, the studies conducted present that there however, is no correlation between sugar and hyperactivity.
Other studies point to synthetic preservatives and artificial colouring agents aggravating attention deficit hyperactivity disorder symptoms in those affected.[unreliable source?] Numerous studies have found a significant correlation between the ingestion of salicylates and hyperactivity in children. Parental reports were more accurate indicators of the presence of additives than clinical tests revealing results not properly gathered to conclude a result.  Two studies show academic performance increased and disciplinary problems decreased in large non-ADHD student populations when artificial ingredients were eliminated from school food programs. Based on all the conducted studies it is not clear yet if there is a correlation between diet and hyperactivity, but the majority of studies done indicate that there may be no correlation between the two.