Nightly fasting duration is not associated with the prevalence of metabolic syndrome among non‐shift workers: The Furukawa Nutrition and Health Studymx

May 28, 2020American journal of human biology : the official journal of the Human Biology Council

Length of nightly fasting is not linked to metabolic syndrome in people who do not work shifts

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Abstract

Among 1,054 non-shift workers in Japan, no significant association was found between nightly fasting duration (NFD) and metabolic syndrome (MetS).

Participants were categorized into four NFD groups based on hours of fasting: ≥12 hours, 11 hours, 10 hours, and ≤9 hours.
Odds ratios for MetS were 1.00 for the highest NFD group, with ratios of 0.83, 0.83, and 0.80 for the lower groups, showing no significant trend (P for trend = 0.50).
No significant associations were observed between NFD and individual components of metabolic syndrome.

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OBJECTIVES: While several experimental studies in animals and humans have suggested the protective effect of nightly fasting duration (NFD) against cardiometabolic risk factors, few population-based studies have been conducted. This study aimed to investigate the association between NFD and metabolic syndrome (MetS) among Japanese non-shift workers.

METHODS: A subset of 1054 non-shift workers from the Furukawa Nutrition and Health Study were included in this analysis. Participants completed dietary and lifestyle surveys during a periodic checkup. NFD was defined as the time between dinner and breakfast and was categorized into four groups (ie, ≥12 hours, 11 hours, 10 hours, and ≤9 hours). MetS was defined as ≥3 of the following components: high waist circumference (≥90 cm [men] and ≥80 cm [women]), high triglycerides (≥150 mg/dL), low high-density lipoprotein cholesterol (<40 mg/dL [men] and <50 mg/dL [women]), hypertension (systolic blood pressure ≥130 mm Hg or diastolic blood pressure ≥85 mm Hg), and high fasting glucose (fasting plasma glucose ≥100 mg/dL or hemoglobin A1c ≥5.6%). A multivariable logistic regression model was used to examine the association between NFD and MetS.

RESULTS: The odds ratios (95% confidence intervals) of MetS for the highest (≥12 hours) through lowest (≤9 hours) NFD categories were 1.00 (reference), 0.83 (0.51-1.35), 0.83 (0.48-1.43), and 0.80 (0.43-1.48) (P for trend = 0.50) after adjusting for covariates. Further analyses on the relationship between NFD and each MetS component found no significant associations.

CONCLUSIONS: We did not find any evidence of a significant association between NFD and MetS among non-shift workers in Japan.

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Nightly fasting duration is not associated with the prevalence of metabolic syndrome among non‐shift workers: The Furukawa Nutrition and Health Studymx

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