Health Effect of Canola Oil Consumption in Shift Workers

The study was designed as a randomized clinical trial to investigate the effects of the dietary intervention with moderate in fat content ( 35% energy as fat) for 12 weeks on the improvement of cardiometabolic risk factors in centrally obese shift workers. Forty centrally obese shift workers (waist circumference ≥94 cm) were randomized (1:1) to the experimental group (n = 20) or the control group (n = 20). Eligibility criteria included: aged between 30‐60 years, working rotating shifts for at least 5 years and working night shifts minimum five times a month. Excluded criteria was described in the point "Eligibility". Written informed consent was obtained from all of the participants, and the local ethic committee approved the study. The dietary intervention was mainly based on the simple rearrangement of shift workers' diets by replacing food items including SFA (e.g. butter) with those being sources of unsaturated fatty acids (UFA), mainly canola oil (given to the diet as spread or this oil was added separately to main meals)