Association of Overnight Fasting and Meal Irregularity with Nutrient Quality and Anthropometric Measures in Adults

Background: Timing, frequency, and regularity as chrono-nutrition are emerging fields in nutritional epidemiology. The authors investigated the association of irregularity in energy intake, frequency, and overnight fasting with nutrient quality and health. Methods: Iranian adults who attended the health center of Tehran participated in this cross-sectional study. Dietary intake was derived from 3-day 24-h dietary recalls of 850 participants. Weight, height, and blood pressure of the participants were measured, and frequency, irregularity, and overnight fasting were recorded from 24-h dietary recall. Then, intra-class correlation coefficient (ICC) was used to obtain the consistency of time regarding three main meals. Following that, energy density was measured and nutrient density was calculated using the nutrient rich food (NRF 9.3) index. Obesity was defined as body mass index (BMI) >30 kg/m2, and blood pressure was measured. Results: The highest consistency regarding the time of meal was observed at breakfast. Frequency was positively related to the intake of fruit, energy, carbohydrate, and NRF 9.3 index (P