It's the gluttonous appetite that makes Ichabod go to the party at Katrina's house and find the Headless Knight on his way out of the party. Brom Bones had succeeded in driving him out of town, making jokes about the way he ate, which may have made him uneasy.
When we read "The Legend of Sleepy Hollow" we have access to the following information:
During the party, Ichabod decides to leave early and although the author of the story has not given the reason, we can infer that he had abdominal discomfort, due to how much he ate.
As he leaves the party, he meets the Headless Knight and is so scared that he falls and disappears.
The author also does not show what happened to him, but it is believed that he left town, embarrassed by Brom Bones' jokes, which could devalue Katrina's view of him.
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