Which type of data does the YFAS primarily rely on?

• A. Physiological measurements.
• B. Clinician observations.
• C. Self-reported responses.
• D. Family reports.

Answer: (C)

Self-reported responses capture the subjective experiences that define addictive‑like eating, which the YFAS measures by asking individuals to report their thoughts, urges, and behaviors over a specified period. Since symptoms like craving intensity, loss of control, distress, and impairment are inherently personal and not directly observable in a standardized physiological signal, the YFAS relies on the respondent’s own account. While objective data such as physiological measurements or clinician observations and collateral reports from family can provide additional context, they are not the primary data source for this instrument. By design, it asks participants to rate the frequency and severity of symptoms, enabling scoring that reflects the person’s perceived eating addiction‑like pattern.