Highly Processed Foods and Poor Diet Quality Among Japanese Youth

Study finds that highly processed foods account for over 25% of energy intake among Japanese youths, linked to poor diet quality.

Researchers from the University of Tokyo have conducted the first study to quantify the consumption of highly processed foods (HPFs) and examine their association with diet quality among Japanese children and adolescents. The study found that HPFs constituted over one-fourth of the total energy intake in this group. Additionally, the consumption of HPFs was inversely related to the intake of healthy foods like fruits, vegetables, and pulses, and positively related to the consumption of confectioneries ().

Study Links Highly Processed Food Consumption to Poor Diet Quality in Japanese Youth

It is well-known that poor-quality diets are significant risk factors for numerous health issues, including noncommunicable diseases such as Type 2 diabetes. As a result, researchers aim to understand the factors influencing diet quality to enhance public health. Interest in HPFs has been growing rapidly due to their potential public health implications. However, there has been limited research on this topic in Japan, particularly focusing on children and adolescents, largely due to difficulties in assessing this demographic.

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‘Did You Know?
Highly processed foods make up over one-fourth of Japanese youths' energy intake, correlating with poor diet quality. #childnutrition #health #medindia’

“Our previous research on HPF consumption in adults in Japan found that higher consumption was negatively associated with diet quality. This significant finding prompted us to investigate whether similar associations exist in younger generations,” said Assistant Professor Nana Shinozaki from the School of Public Health. “My team and I ran a cross-sectional study, one where many people are assessed in a short space of time rather than fewer people over a long period of time, to understand the association between HPF consumption and overall diet quality among Japanese children and adolescents. We found that higher HPF consumption is associated with poorer diet quality in 1,318 participants aged 3-17 years.”

Japanese Youth Diets: Challenges and Findings

This probably doesn’t come as a surprise to many, but it’s important to note that this is the first time hard data has been put to this specific demographic, and that fact might aid in improving public health. One of the difficulties in research on diets is that so many of the issues lack precise definitions. For this reason, Shinozaki and her team picked an existing dietary classification framework developed by researchers at the University of North Carolina at Chapel Hill (UNCCH) in the U.S. to classify the food that participants consumed, and the Healthy Eating Index-2020 and the Nutrient-Rich Food Index 9.3 to evaluate the quality of their diets. Under the UNCCH classification, HPFs are defined as “multi-ingredient, industrially formulated mixtures processed to the extent that they are no longer recognizable as their original plant/animal source.”

“The biggest challenge was collecting detailed dietary data, which are essential to identify which foods are HPFs, on eight days over the course of a year from a large sample of about 1,300 individuals,” said Shinozaki. “This process of assessment by researchers, and assessments by participants or parents, was highly burdensome for both participants and investigators due to the need for accurate and consistent recording of dietary intake. Our research could not have been accomplished without the support of research dietitians throughout Japan, who played a crucial role in supporting participants and collecting data.”

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What might surprise some readers is that the cliché of Japan’s national diet being the model of healthy eating is a little inaccurate and out of date.

“Professor Kentaro Murakami (of the University of Tokyo) recently found that in a nationally representative sample of Japanese adults, the mean total score of the Healthy Eating Index-2015, a widely accepted diet quality index, was similar to that of average Americans. This finding suggests that the Japanese diet would not be as healthy as expected,” said Shinozaki. “Wherever you may be, at the individual level, increasing the consumption of unprocessed or minimally processed foods, especially fresh fruits and vegetables, would be helpful. At the societal level, public awareness campaigns, policy and regulation, or food availability and market changes to promote the reduction of HPFs could be beneficial. Our findings support ongoing efforts to develop nutritional guidelines and public health strategies aimed at reducing the prevalence of diet-related diseases.”

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Reference:

Consumption of highly processed foods in relation to overall diet quality among Japanese adults: a nationwide study - (https://pubmed.ncbi.nlm.nih.gov/37092752/)

Source-Eurekalert

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