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Association between dietary tea consumption and non-alcoholic fatty liver disease: a study based on Mendelian randomisation and National Health and Nutrition Examination Survey (2005-2018) association between tea and non-alcoholic fatty liver disease

Published online by Cambridge University Press:  30 October 2024

Shuyu Liu
Affiliation:
Medical Center for Digestive Diseases, Second Affiliated Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
Quanpeng Li
Affiliation:
Medical Center for Digestive Diseases, Second Affiliated Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
Peng Chen
Affiliation:
The Fourth Affiliated Hospital of Nanjing Medical University, Nanjing, People’s Republic of China
Yuting Wang
Affiliation:
Medical Center for Digestive Diseases, Second Affiliated Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
Xianxiu Ge
Affiliation:
Medical Center for Digestive Diseases, Second Affiliated Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
Fei Wang
Affiliation:
Medical Center for Digestive Diseases, Second Affiliated Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
Mengyue Zhou
Affiliation:
Department of Gastroenterology of Nanjing Pukou Hospital of Traditional Chinese Medicine, Nanjing, People’s Republic of China
Jianing Xu
Affiliation:
Medical Center for Digestive Diseases, Second Affiliated Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
Yingting Zhu
Affiliation:
Medical Center for Digestive Diseases, Second Affiliated Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
Lin Miao*
Affiliation:
Medical Center for Digestive Diseases, Second Affiliated Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
Xueting Deng*
Affiliation:
Medical Center for Digestive Diseases, Second Affiliated Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
*
*Corresponding authors: Xueting Deng, email [email protected]; Lin Miao, email [email protected]. Institution email: [email protected]
*Corresponding authors: Xueting Deng, email [email protected]; Lin Miao, email [email protected]. Institution email: [email protected]

Abstract

Tea can improve the progression of some metabolic diseases through anti-inflammatory and antioxidant effects, but its impact on non-alcoholic fatty liver disease (NAFLD) is still controversial. The aim of this paper is to identify the relationship between tea and NAFLD by Mendelian randomisation (MR) and complete clinical validation using National Health and Nutrition Examination Survey (NHANES) database. MR used data from Genome Wide Association Study, with inverse-variance weighted (IVW) as principal analytical methods. The reliability of the results was verified by a series of sensitivity and heterogeneity tests. Subsequently, clinical validation was conducted using NHANES (2005–2018), involving 22 257 participants, grouped by the type of tea. Green tea drinkers were categorised into four groups (Q1–Q4) by quartiles of green tea intake, from lowest to highest (similar for black tea drinkers and other tea drinkers). Models were constructed by logistic regression to estimate the role of tea consumption (Q1–4) on NAFLD. Finally, using fibrosis-4 index (FIB-4) to evaluate the severity of hepatic fibrosis, the effect of tea consumption (Q1–4) on the degree of hepatic fibrosis was investigated by linear regression. IVW method (OR = 0·43, 95 % CI: 0·21, 0·85, P = 0·01) and weighted median method (OR = 0·35, 95 % CI: 0·14, 0·91, P = 0·03) revealed there was a causal relationship between tea and NAFLD. An array of sensitivity analyses validated the reliability of results. Analysis of NHANES indicated tea drinker present a slightly lower prevalence of NAFLD than non-tea drinker (green tea drinkers: 47·6 %, black tea drinkers: 46·3 %, other tea drinker: 43·2 %, non-tea drinkers: 48·1 %, P < 0·05). After adjusting for confounders, compared with the lowest black tea consumption (Q1), the population with the highest black tea consumption (Q4) was independently related to lower presence of NAFLD (Q4: OR = 0·69, 95 % CI: 0·50, 0·93, P < 0·05), such association remained stable in the overweight subgroup. As further analysed, Q4 also displayed a significant negative correlation with the level of hepatic fibrosis in patients with NAFLD (β = –0·073, 95 % CI: –0·126, −0·020, P < 0·01).Tea reduces the morbidity of NAFLD and ameliorates hepatic fibrosis degree in those already suffering from the disease.

Type
Research Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Nutrition Society

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