Final answer:
A diet high in refined sugar can lead to obesity and predispose a person to adult-onset diabetes.
Step-by-step explanation:
The evidence in the given statement is that a diet high in refined sugar can make a person overweight, and being overweight can predispose a person to adult-onset diabetes. This is supported by the information provided in the references, which state that consumption of too many refined carbohydrates can lead to obesity and the development of diabetes. The conclusion based on this evidence is that it is inaccurate to say that a diet high in refined sugar cannot cause adult-onset diabetes.