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Frontiers of Medicine

ISSN 2095-0217

ISSN 2095-0225(Online)

CN 11-5983/R

Postal Subscription Code 80-967

2018 Impact Factor: 1.847

Front. Med.    2023, Vol. 17 Issue (1) : 156-164    https://doi.org/10.1007/s11684-022-0932-3
RESEARCH ARTICLE
J-shaped association between dietary zinc intake and new-onset hypertension: a nationwide cohort study in China
Panpan He1, Huan Li1, Mengyi Liu1, Zhuxian Zhang1, Yuanyuan Zhang1, Chun Zhou1, Ziliang Ye1, Qimeng Wu1, Min Liang1, Jianping Jiang1, Guobao Wang1, Jing Nie1, Fan Fan Hou1, Chengzhang Liu2,3, Xianhui Qin1()
1. Division of Nephrology, Nanfang Hospital, Southern Medical University; National Clinical Research Center for Kidney Disease; State Key Laboratory of Organ Failure Research; Guangdong Provincial Institute of Nephrology, Guangdong Provincial Key Laboratory of Renal Failure Research, Guangdong Provincial Clinical Research Center for Kidney Disease, Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou 510515, China
2. Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei 230032, China
3. Institute of Biomedicine, Anhui Medical University, Hefei 230032, China
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Abstract

We aimed to investigate the relationship of dietary zinc intake with new-onset hypertension among Chinese adults. A total of 12,177 participants who were free of hypertension at baseline from the China Health and Nutrition Survey were included. Dietary intake was assessed by three consecutive 24-h dietary recalls combined with a household food inventory. Participants with systolic blood pressure ≥ 140 mmHg or diastolic blood pressure ≥ 90 mmHg or diagnosed by a physician or under antihypertensive treatment during the follow-up were defined as having new-onset hypertension. During a median follow-up duration of 6.1 years, 4269 participants developed new-onset hypertension. Overall, the association between dietary zinc intake and new-onset hypertension followed a J-shape (P for non-linearity < 0.001). The risk of new-onset hypertension significantly decreased with the increment of dietary zinc intake (per mg/day: hazard ratio (HR) 0.93; 95% confidence interval (CI) 0.88–0.98) in participants with zinc intake <10.9 mg/day, and increased with the increment of zinc intake (per mg/day: HR 1.14; 95% CI 1.11–1.16) in participants with zinc intake ≥ 10.9 mg/day. In conclusion, there was a J-shaped association between dietary zinc intake and new-onset hypertension in general Chinese adults, with an inflection point at about 10.9 mg/day.

Keywords dietary zinc intake      new-onset hypertension      general population      CHNS     
Corresponding Author(s): Xianhui Qin   
Just Accepted Date: 04 November 2022   Online First Date: 25 December 2022    Issue Date: 15 March 2023
 Cite this article:   
Panpan He,Huan Li,Mengyi Liu, et al. J-shaped association between dietary zinc intake and new-onset hypertension: a nationwide cohort study in China[J]. Front. Med., 2023, 17(1): 156-164.
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https://academic.hep.com.cn/fmd/EN/10.1007/s11684-022-0932-3
https://academic.hep.com.cn/fmd/EN/Y2023/V17/I1/156
Characteristics Zinc intake (mg/day) P value
Q1 ( < 10.0) Q2 (10.0 to < 11.0) Q3 (11.0 to < 12.2) Q4 (≥12.2)
N 3044 3044 3044 3045
Age (years) 41.0 (14.3) 41.2 (14.1) 40.5 (14.0) 42.1 (14.3) < 0.001
Male (n (%)) 1358 (44.6) 1317 (43.3) 1421 (46.7) 1602 (52.6) < 0.001
BMI (kg/m2) 22.7 (3.1) 22.3 (3.1) 22.2 (3.0) 22.4 (3.1) < 0.001
SBP (mmHg) 114.1 (11.3) 113.9 (11.5) 113.1 (11.4) 114.4 (11.4) < 0.001
DBP (mmHg) 74.2 (8.0) 74.2 (7.9) 73.8 (7.7) 74.5 (7.7) 0.003
Current smoking (n (%)) 883 (29.1) 886 (29.3) 895 (29.5) 1024 (33.8) < 0.001
Current alcohol drinking (n (%)) 971 (32.2) 947 (31.4) 1033 (34.4) 1187 (39.5) < 0.001
Self-report diabetes (n (%)) 29 (1.0) 35 (1.2) 39 (1.3) 50 (1.7) 0.100
Urban residence (n (%)) 903 (29.7) 1057 (34.7) 1109 (36.4) 1336 (43.9) < 0.001
eGFR (mL/min/1.73 m2) 88.0 (16.0) 84.7 (16.1) 84.3 (16.4) 82.5 (16.8) < 0.001
Physical activity, MET-h/week 162.7 (140.1) 161.0 (139.7) 162.2 (135.6) 142.1 (127.4) < 0.001
Regions (n (%) < 0.001
Central 1699 (55.8) 1416 (46.5) 1247 (41.0) 1220 (40.1)
North 710 (23.3) 723 (23.8) 565 (18.6) 486 (16.0)
South 635 (20.9) 905 (29.7) 1232 (40.5) 1339 (44.0)
Occupation (n (%)) < 0.001
Famer 1171 (39.0) 1196 (39.8) 1122 (37.1) 859 (28.5)
Worker 312 (10.4) 351 (11.7) 404 (13.4) 390 (12.9)
Unemployed 829 (27.6) 738 (24.5) 697 (23.0) 773 (25.6)
Other 687 (22.9) 723 (24.0) 802 (26.5) 993 (32.9)
Education (n (%)) < 0.001
Illiteracy 588 (19.7) 599 (20.1) 533 (17.9) 485 (16.2)
Primary school 631 (21.1) 593 (19.9) 584 (19.6) 519 (17.4)
Middle school 1030 (34.5) 1024 (34.3) 979 (32.8) 958 (32.0)
High school or above 737 (24.7) 767 (25.7) 889 (29.8) 1028 (34.4)
Dietary intake
Energy ( kcal/day) 2236.7 (535.0) 2135.9 (500.1) 2150.3 (505.1) 2189.5 (522.8) < 0.001
Fat (g/day) 81.3 (33.6) 71.0 (28.0) 70.6 (26.9) 74.3 (27.8) < 0.001
Carbohydrate (g/day) 315.2 (102.6) 311.0 (94.1) 311.4 (99.8) 304.4 (101.0) < 0.001
Protein (g/day) 61.0 (17.1) 63.1 (16.2) 67.4 (16.7) 75.8 (21.0) < 0.001
Sodium (g/day) 5.4 (3.1) 4.9 (2.7) 5.0 (2.9) 4.8 (3.3) < 0.001
Potassium (g/day) 1.5 (0.5) 1.6 (0.4) 1.7 (0.5) 1.9 (0.8) < 0.001
Na/K 3.7 (2.4) 3.3 (1.9) 3.1 (2.0) 2.7 (1.8) < 0.001
Tab.1  Population characteristics by quartiles of dietary zinc intake
Fig.1  Relation of dietary zinc intake with risk of new-onset hypertension. Adjusted for age, sex, body mass index (BMI), smoking and drinking status, systolic blood pressure (SBP), diastolic blood pressure (DBP), education levels, occupations, urban or rural residence, sodium-to-potassium intake ratio (Na/K), and energy intake.
Zinc intake (mg/day) n Cases (incidence rate) Crude model Adjusted model
HR (95% CI) P value HR (95% CI) P value
< 10.9 5899 2034 (43.6) 0.88 (0.84–0.92) < 0.001 0.93 (0.88–0.98) 0.003
≥ 10.9 6278 2235 (46.1) 1.14 (1.12–1.16) < 0.001 1.14 (1.11–1.16) < 0.001
Tab.2  Threshold effect analyses of dietary zinc intake on the risk of new-onset hypertension using two-piecewise regression models
Zinc intake (mg/day) n Cases (incidence rate) Crude models Adjusted models
HR (95% CI) P value HR (95% CI) P value
Quartiles
Q1 ( < 10.0) 3044 1045 (46.3) Ref
Q2 (10.0 – < 11.0) 3044 1044 (40.4) 0.87 (0.80–0.94) 0.001 0.92 (0.84–1.00) 0.060
Q3 (11.0 – < 12.2) 3044 975 (37.8) 0.81 (0.74–0.89) < 0.001 0.91 (0.83–1.00) 0.042
Q4 (≥12.2) 3045 1205 (57.4) 1.25 (1.15–1.36) < 0.001 1.30 (1.19–1.42) < 0.001
Categories
Q1 ( < 10.0) 3044 1045 (46.3) 1.19 (1.11–1.28) < 0.001 1.09 (1.01–1.18) 0.024
Q2–3 (10.0 – < 12.2) 6088 2019 (39.1) Ref Ref
Q4 (≥12.2) 3045 1205 (57.4) 1.49 (1.39–1.60) < 0.001 1.42 (1.32–1.53) < 0.001
Tab.3  Association between dietary zinc intake and the risk of new-onset hypertension
Fig.2  Stratified analyses by potential effect modifiers for the association between dietary zinc intake and new-onset hypertension in various subgroups divided by 10.9 mg/day. (A) Zinc intake < 10.9 mg/day. (B) Zinc intake ≥10.9 mg/day. Incidence rate is presented as per 1000 person-years of follow-up. Adjusted, if not stratified, for age, sex, body mass index (BMI), smoking and drinking status, systolic blood pressure (SBP), diastolic blood pressure (DBP), education levels, occupations, urban or rural residence, sodium-to-potassium intake ratio (Na/K), and energy intake.
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