Why does the health belief persist even when not supported by evidence?

Sugar Makes Children Hyperactive
Increasing numbers of parents today believe that allowing their children to consume sugar in any form makes the children behave in a hyperactive manner. They feel that changes in their children’s mood and actions are clearly linked to what they eat, which often centres on sugar but also sometimes extends to food colouring agents and preservatives. The behaviour problems in question are said to be greater than what would be expected in terms of a normal increase in energy after eating, and, as a result, many parents severely restrict what they allow young children to eat and drink.
Question to answer please answer the question clearly:
Why does the health belief persist even when not supported by evidence?
You can answer it this way : why this health belief (Sugar Makes Children Hyperactive) persists even when not supported by evidence.
Please use only journal articles (2 max). And peer review journal articles is a must (at least 4).
You can write around 800-900 words that fine

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