Based on the provided case study, explain the most likely physiological reason for the patient's change in eating behavior and subsequent weight loss.

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The movement of food through the gastrointestinal tract provides the brain with important satiety signals. This feedback mechanism contributes to the feeling of fullness and satisfaction, playing a crucial role in stopping eating behavior.

Gastrointestinal Satiety Signals

A food scientist is creating two different meal replacement bars designed to help with weight management. Bar A is low in fiber and breaks down very quickly in the stomach. Bar B is high in fiber and takes much longer to digest and pass through the digestive system. Based on the feedback mechanisms between the digestive system and the brain, which bar would be more effective at making someone feel full for a longer period, and why?

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