Reframing a feeling calms your body. Hiding it doesn't fool anyone, least of all you
Psychologist James Gross found that people who consciously reinterpret an upsetting situation ('reappraisal') feel less distress and show calmer physiological responses than people who just grit their teeth and hide the emotion ('suppression'). Suppression takes a steady mental toll and doesn't fool the body — heart rate and stress hormones stay elevated even while the face looks composed.