The disparity between hunger depletion rates in the Java Edition and the Bedrock Edition is so significant that I feel it could be unintended.
I created a video exploring the differences that I've found, but the most notable is that, when sprint-jumping at Normal difficulty, the Java version loses a hunger point every ten seconds, while, in the Bedrock version, a hunger point is lost every two seconds.
Additionally, with the starting saturation values of a new world, players on the Java Edition are able to sprint for ~2 minutes longer, and can jump ~6 minutes longer before they begin to take damage from starvation.
Video: https://www.youtube.com/watch?v=IZ9x_TCFxWw
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We're tracking this issue in MCPE-56031, so this ticket is being resolved and linked as a duplicate.
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Java had made some tweaks to the properties of Hunger in the Combat Test updates, maybe it is because of that?