We can now dismiss the widely held suspicion that sugar consumption often exacerbates hyperactivity in children with attention deficit disorder.
Evidence
A scientific study of the effects of three common sugars—sucrose, fructose, and glucose—on children who have attention deficit disorder, with experimental groups each receiving a type of sugar in their diets and a control group receiving a sugar substitute instead of sugar, showed no statistically significant difference between the groups in thinking or behavior.
Conclusion
We can now dismiss the widely held suspicion that sugar consumption often exacerbates hyperactivity in children with attention deficit disorder.
Evaluate
The argument refutes a causal relationship by providing a study that supposedly demonstrated a counterexample. The argument concludes that sugar does not exacerbate hyperactivity in children with attention deficit disorder, because children who consumed sugar did not exhibit more hyperactivity than those who consumed a sugar substitute. The argument assumes that sugar substitutes do not exacerbate hyperactivity in children with attention deficit disorder.