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These procedures encompassed <jats:italic>n<\/jats:italic> = 19 P<jats:sub>AN<\/jats:sub>, age, and gender matched to <jats:italic>n<\/jats:italic> = 19 healthy controls (HC). Food intake and chewing frequency were assessed in two experimental conditions: rest versus stress (via Trier Social Stress Test). To verify stress induction, two appraisal scales were employed. In addition, chronic stress, psychological distress and eating disorder symptoms were assessed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In terms of food intake and chewing frequency, the results of the 2x2 ANOVA demonstrated a significant effect of <jats:italic>condition<\/jats:italic> and <jats:italic>group<\/jats:italic>. During stress, all participants demonstrated a higher chewing frequency and a decreased ingestion. In general, patients ate less at a lower chewing frequency (vs. HC). However, sample specific analyses demonstrated that the eating and chewing behavior of P<jats:sub>AN<\/jats:sub> remained unchanged regardless of the condition, except for their drinking. Food choices were comparable between the groups, but appetite values significantly differed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>The increase in chewing frequency in all participants during stress suggests that chewing might impact affect regulation, however, not specifically in P<jats:sub>AN<\/jats:sub>. Future research should clarify to what extent the normalization of chewing behavior could ameliorate ED\u2010symptoms (incl. food intake) in P<jats:sub>AN<\/jats:sub>. 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