Vitamin D Status in Japanese Young Women in 2016–2017 and 2020: Seasonal Variation and the Effect of Lifestyle Including Changes Caused by the COVID-19 Pandemic

Tsugawa, Naoko; Kuwabara, Akiko; Ogasawara, Honami; Nishino, Mayu; Nakagawa, Kimie; Kamao, Maya; Hasegawa, Hiroshi; Tanaka, Kiyoshi

doi:10.3177/jnsv.68.172

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…Approximately 35% of adults in the United States have vitamin D deficiency. In Japan, the frequencies of vitamin D deficiency in young women were 90.5%, 62.5%, 81.5%, and 91.3 in spring, summer, fall, and winter, respectively [41]. As our patients were admitted to our department from December 2022 to February 2023, these data are not contradictory to our data that 98% of young underweight patients are diagnosed with vitamin D deficiency.…”

Section: Discussionsupporting

confidence: 47%

Young Japanese Underweight Women with “Cinderella Weight” Are Prone to Malnutrition, including Vitamin Deficiencies

Iizuka,

Sato,

Kobae

et al. 2023

Nutrients

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Undernutrition among young women at “Cinderella weight” is socially important in Japan. To determine the nutritional status of Cinderella-weight women, we conducted an exploratory cross-sectional study on the health examination results of employees aged 20 to 39 (n = 1457 and 643 for women and men, respectively). The percentage of underweight women was found to be much higher than that of men (16.8% vs. 4.5%, respectively). In underweight women (n = 245), handgrip strength (22.82 ± 5.55 vs. 25.73 ± 5.81 kg, p < 0.001), cholesterol level (177.8 ± 25.2 vs. 194.7 ± 31.2 mg/dL, p < 0.05), and lymphocyte count (1883 ± 503 vs. 2148 ± 765/μL, p < 0.001) were significantly lower than in overweight women (n = 116). Then, the BMI < 17.5 group (n = 44) was referred to the outpatient nutrition evaluation clinic. Lower prealbumin, cholesterol, and lymphocyte levels were also observed in 34%, 59%, and 32% of the patients, respectively. Regarding dietary characteristics, 32% of the underweight women in this study skipped breakfast, and 50% had low dietary diversity scores. Lower total energy intake, carbohydrate and fiber intake, and Ca and Fe intake were also observed in 90% of the patients. Deficiencies in vitamin B1, B12, D, and folate were diagnosed in 4.6%, 25%, 14%, and 98% of the patients, respectively. Thus, young underweight women may be prone to malnutrition.

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Section: Discussionsupporting

confidence: 47%

Young Japanese Underweight Women with “Cinderella Weight” Are Prone to Malnutrition, including Vitamin Deficiencies

Iizuka,

Sato,

Kobae

et al. 2023

Nutrients

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“…Tsugawa et al [ 36 ] provided a study conducted on young women in which they measured 25(OH)D concentrations from May 2016 to June 2017 and in September 2020 (after lockdown due to COVID-19). They showed a significant difference in 25(OH)D levels between the samples obtained in September 2016 and in September 2020 (21.7 ± 6.6 ng/mL vs. 13.2 ± 5.0 ng/mL).…”

Section: Discussionmentioning

confidence: 99%

The Variability of Vitamin D Concentrations in Short Children with Short Stature from Central Poland—The Effects of Insolation, Supplementation, and COVID-19 Pandemic Isolation

Smyczyńska,

Pawelak,

Hilczer

et al. 2023

Nutrients

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The aim of the study was to investigate the effects of seasonal variability of insolation, the implementation of new recommendations for vitamin D supplementation (2018), and the SARS-CoV-2 pandemic lockdown (2020) on 25(OH)D concentrations in children from central Poland. The retrospective analysis of variability of 25(OH)D concentrations during the last 8 years was performed in a group of 1440 children with short stature, aged 3.0–18.0 years. Significant differences in 25(OH)D concentrations were found between the periods from mid-2014 to mid-2018, from mid-2018 to mid-2020, and from mid-2020 to mid-2022 (medians: 22.9, 26.0, and 29.9 ng/mL, respectively). Time series models created on the grounds of data from 6 years of the pre-pandemic period and used for prediction for the pandemic period explained over 80% of the seasonal variability of 25(OH)D concentrations, with overprediction for the first year of the pandemic and underprediction for the second year. A significant increase in 25(OH)D concentrations was observed both after the introduction of new vitamin D supplementation guidelines and during the SARS-CoV-2 pandemic; however, the scale of vitamin D deficiency and insufficiency was still too high. Time series models are useful in analyzing the impact of health policy interventions and pandemic restrictions on the seasonal variability of vitamin D concentrations.

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Vitamin D status and clinical implications in the adult population of Malaysia: a position paper by the Malaysian Vitamin D Special Interest Group

Lee,

Chee,

Foo

et al. 2023

Osteoporos Int

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Vitamin D Status in Japanese Young Women in 2016–2017 and 2020: Seasonal Variation and the Effect of Lifestyle Including Changes Caused by the COVID-19 Pandemic

Cited by 4 publications

References 31 publications

Young Japanese Underweight Women with “Cinderella Weight” Are Prone to Malnutrition, including Vitamin Deficiencies

Young Japanese Underweight Women with “Cinderella Weight” Are Prone to Malnutrition, including Vitamin Deficiencies

The Variability of Vitamin D Concentrations in Short Children with Short Stature from Central Poland—The Effects of Insolation, Supplementation, and COVID-19 Pandemic Isolation

Vitamin D status and clinical implications in the adult population of Malaysia: a position paper by the Malaysian Vitamin D Special Interest Group

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