Background: Consumption of home-prepared meals may lead to better nutritional intake. Few studies have examined the association between the frequency of consuming meals prepared away from home and the inadequacy of nutritional intake based on nutritional standards and food group intake. We therefore aimed to investigate this issue among Japanese adults.
Methods: This study was a secondary analysis of the 2015 National Health and Nutrition Survey in Japan, involving 921 men and 1300 women aged 18–64 years, conducted as a cross-sectional survey. The frequency of consuming meals prepared away from home was defined using two questions inquiring about the frequency of eating out and take-away meals. Data on dietary intake were collected using a one-day semi-weighed household dietary record. Participants were stratified into three groups based on the frequency of consuming meals prepared away from home (High, Moderate, Low). The inadequacy of each nutrient intake was assessed by comparing estimated average requirement (EAR) level for 14 nutrients and the range of the dietary goal (DG) for seven nutrients according to the 2015 version of the Dietary Reference Intake for Japanese. Group differences in nutrients adequacy were assessed using the covariate and logistic regression analysis, respectively. Food intake was also compared across the groups by classifying each food item into 17 groups based on food group table.
Results: The proportion of participants who consumed home-prepared meals almost every day were 34.9% among men and 46.8% among women, and the proportion of those consuming a higher frequency of meals prepared away from home were 14.7% and 6.3%, respectively. A higher frequency of consuming meals prepared away from home was associated with inadequacy of dietary fiber, vitamin C and minerals (iron, magnesium and potassium) intake, and with lower intake of vegetables and higher intake of fat and oils.
Conclusions: High frequency of consuming meals prepared away from home was associated with insufficient intake of dietary fiber, vitamin C and multiple minerals among Japanese adults. Dietary fiber and mineral intake may be the potential target of interventions aimed at improving nutrient intake in individuals who predominantly eat food prepared away from home.

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Posted 25 Jan, 2021
On 19 Jan, 2021
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On 19 Jan, 2021
On 21 Dec, 2020
Received 16 Dec, 2020
On 14 Dec, 2020
Received 16 Nov, 2020
On 04 Nov, 2020
Invitations sent on 31 Oct, 2020
On 08 Oct, 2020
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On 11 Aug, 2020
Received 07 Aug, 2020
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Received 25 Jun, 2020
On 22 Jun, 2020
Invitations sent on 05 Jun, 2020
On 02 Jun, 2020
On 01 Jun, 2020
On 25 May, 2020
On 23 May, 2020
Posted 25 Jan, 2021
On 19 Jan, 2021
On 19 Jan, 2021
On 19 Jan, 2021
On 21 Dec, 2020
Received 16 Dec, 2020
On 14 Dec, 2020
Received 16 Nov, 2020
On 04 Nov, 2020
Invitations sent on 31 Oct, 2020
On 08 Oct, 2020
On 07 Oct, 2020
On 07 Oct, 2020
On 11 Aug, 2020
Received 07 Aug, 2020
On 05 Aug, 2020
Received 25 Jun, 2020
On 22 Jun, 2020
Invitations sent on 05 Jun, 2020
On 02 Jun, 2020
On 01 Jun, 2020
On 25 May, 2020
On 23 May, 2020
Background: Consumption of home-prepared meals may lead to better nutritional intake. Few studies have examined the association between the frequency of consuming meals prepared away from home and the inadequacy of nutritional intake based on nutritional standards and food group intake. We therefore aimed to investigate this issue among Japanese adults.
Methods: This study was a secondary analysis of the 2015 National Health and Nutrition Survey in Japan, involving 921 men and 1300 women aged 18–64 years, conducted as a cross-sectional survey. The frequency of consuming meals prepared away from home was defined using two questions inquiring about the frequency of eating out and take-away meals. Data on dietary intake were collected using a one-day semi-weighed household dietary record. Participants were stratified into three groups based on the frequency of consuming meals prepared away from home (High, Moderate, Low). The inadequacy of each nutrient intake was assessed by comparing estimated average requirement (EAR) level for 14 nutrients and the range of the dietary goal (DG) for seven nutrients according to the 2015 version of the Dietary Reference Intake for Japanese. Group differences in nutrients adequacy were assessed using the covariate and logistic regression analysis, respectively. Food intake was also compared across the groups by classifying each food item into 17 groups based on food group table.
Results: The proportion of participants who consumed home-prepared meals almost every day were 34.9% among men and 46.8% among women, and the proportion of those consuming a higher frequency of meals prepared away from home were 14.7% and 6.3%, respectively. A higher frequency of consuming meals prepared away from home was associated with inadequacy of dietary fiber, vitamin C and minerals (iron, magnesium and potassium) intake, and with lower intake of vegetables and higher intake of fat and oils.
Conclusions: High frequency of consuming meals prepared away from home was associated with insufficient intake of dietary fiber, vitamin C and multiple minerals among Japanese adults. Dietary fiber and mineral intake may be the potential target of interventions aimed at improving nutrient intake in individuals who predominantly eat food prepared away from home.

Figure 1
This is a list of supplementary files associated with this preprint. Click to download.
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