P035 Investigating the Relationship Between Dietary Timing and Obstructive Sleep Apnoea.

Abstract Introduction Late night eating is associated with obstructive sleep apnoea (OSA) and may increase obesity risk. Time Restricted Eating (TRE) involves shifting the eating window to 8-12 continuous hours per day, prompting energy intake to earlier in the day without any complex dietary prescription, and has metabolic benefits. We aimed to investigate timing of food intake in patients with OSA and assess their openness to trial TRE. Methods Adults undergoing in-laboratory diagnostic polysomnography (PSG, n=138, 67 male) completed a dietary questionnaire outlining typical eating habits, including timing of meals, frequency of getting up overnight, and frequency of eating/drinking overnight. Questionnaire responses were reviewed with demographics and PSG variables. Proportions of responses were compared across categories of OSA severity using z-tests. Results Patients with moderate/severe OSA (AHI>15events/h, n=77) were more likely to report getting up at night “often” or “always” compared to patients with no/mild OSA (n=61) (63.6% v 47.5%, p=0.08), more likely to report getting up multiple times (66.2% v 47.5%, p=0.04), and more likely to report eating/drinking overnight (42.9% v 18.0%, p=0.003). 71.0% of all patients indicated they would consider trying a TRE diet, and 71.7% could incorporate a TRE diet into their lifestyle. Conclusion Moderate/severe OSA is associated with an increased likelihood of getting up multiple times overnight, and getting up to eat and drink. Patients in this clinical cohort reported a willingness to trial TRE. Future research should investigate the efficacy of implementing TRE in OSA and evaluating its effect on weight loss and sleep quality.