# Relative Excess Risk of Metabolic Syndrome Due to Interaction Between Handgrip Strength and Dietary Patterns Among Korean Youth

## TL;DR

This study finds that low handgrip strength is a significant risk factor for metabolic syndrome in Korean adolescents, regardless of diet.

## Contribution

The study is the first to examine the combined effects of handgrip strength and dietary patterns on metabolic syndrome in adolescents.

## Key findings

- Low handgrip strength was independently linked to higher odds of metabolic syndrome in both male and female adolescents.
- Unhealthy dietary patterns combined with low handgrip strength increased MetS risk in males, though the interaction was not synergistic.
- Promoting muscular strength in adolescents is important for reducing metabolic syndrome risk, even without an unhealthy diet.

## Abstract

Background/Objectives: Metabolic syndrome (MetS) in adolescence increases chronic disease risk in adulthood. No study has explored the combined effects of skeletal muscle strength and dietary patterns in MetS. This study aimed to examine the individual and combined effects of dietary patterns and HGS on MetS and its components in Korean adolescents. Methods: Using the 2014–2019 Korea National Health and Nutrition Examination Survey data, a weighted sample of approximately 3.75 million adolescents was included. Dietary patterns were derived using principal component analysis. Relative handgrip strength (HGS) was calculated. Multivariable logistic regression and relative excess risk due to interaction (RERI) were used to assess dietary patterns, HGS, and MetS, stratified by sex and adjusted for age, smoking, alcohol consumption, economic status, residential area, and physical activity. Results: Low HGS was independently associated with a high odds of developing MetS in both men (OR, 1.108; 95% CI, 1.038–1.182) and women (OR, 1.128; 95% CI, 1.047–1.216). In contrast, dietary pattern alone was not significantly associated with MetS. Men with both low HGS and unhealthy dietary patterns (processed fat or Western diet) had higher odds of developing MetS, even though the interaction was sub-additive, as indicated by negative RERI values (processed fat: −0.22; Western diet: −0.11). Conclusions: Low HGS was a significant risk factor for MetS in Korean adolescents. Although no synergistic interaction was observed, low HGS remained a significant independent risk factor for MetS, underscoring the need to promote muscular strength in adolescents even in the absence of an unhealthy diet.