Tobacco Smoking and Association between Betel Nut Chewing and Metabolic Abnormalities Among Military Males: The CHIEF Study

Perceived stress and betel quid dependence associated with reasons for betel quid chewing among male chewers: a mixed methods study

AIMS

Social culture concerns and betel quid (BQ) dependence may be the potential reasons for BQ chewing. This study's purpose was to identify the correlates of reasons for male BQ chewing.

METHODS

We adopted a mixed-methods design. The study was conducted between October 2021 and August 2023 at a medical center of northern Taiwan. The Reasons for Betel-Quid Chewing Scale, Numeric Rating Scale, and Betel Quid Dependence Scale were used to quantitatively assess reasons for BQ chewing, stress, and BQ dependence, respectively. Semi-structured questions were used to interview for qualitative data.

RESULTS

Among 150 BQ users, the most common reasons for BQ chewing were stimulation, reinforcement, and social/cultural factors. Chewers who reported more pressure to chew were more likely to be younger, have less educational level, be employed, have greater stress, and have more BQ dependence. Content analysis of qualitative data showed three themes: physical and psychological demands, peer pressure, and perceived greater effectiveness.

CONCLUSION

Employment was the factor most commonly associated with reasons for BQ chewing and with each construct. Study findings can help healthcare professionals understand reasons for BQ chewing, thereby helping them educate chewers to cope with withdrawal symptoms and successfully quit.

Substances use and risk of hypertension before midlife in military young adults: CHIEF cohort study, 2014-2020

BACKGROUND

The use of substances, e.g., tobacco and betel nut, are prevalent among military personnel in Taiwan, whereas some specific substances such as alcohol use are forbidden in military base. There were inconsistent findings for the incidence of hypertension with habitual substances use in diverse populations, while no studies were carried out in the military.

METHODS

A total of 2419 Taiwanese military personnel, aged 18-39 years, who were not taking any antihypertensive agents and did not have a baseline systolic blood pressure (SBP) ≥130 mmHg and/or diastolic blood pressure (DBP) ≥80 mmHg were followed for incidence of hypertension from baseline (2014) through the end of 2020. Alcohol, tobacco and betel nut use status (active vs. former/never) were self-reported by each participant at baseline. New-onset hypertension of each participant was defined by an average of two resting BP measurements in the annual health examinations (2015-2020). Multivariable Cox regression analysis with adjustments for baseline BP and other potential covariates were performed to determine the risk of incident hypertension with each substance use. Five-year absolute changes in BP level with specific substance use were compared using analysis of covariance (ANCOVA).

RESULTS

There were 867 active smokers (35.8 %), 237 active betel nut chewers (9.8 %) and 961 active alcohol consumers (39.7 %) at baseline. During a median follow-up of 5.8 years, 911 new-onset hypertension events (37.7 %) were observed. While compared to those without any substances use, merely active holiday alcohol users had a significantly lower risk of incident hypertension [hazard ratio (HR) and 95 % confidence interval: 0.72 (0.58-0.89)]. The 5-year diastolic BP increase (mmHg) was borderline significantly lower in active alcohol users on holidays as compared to former/never alcohol users (4.02 (standard deviation =9.01) and 4.76 (9.42), p = 0.07). The risk of incident hypertension was not significant in active smokers and active betel nut users, while the 5-year BP increase level was significantly greater in active smokers than former/never smokers (5.60 (9.96) vs. 4.42 (9.22), p = 0.03).

CONCLUSION

Our findings suggest that military young personnel consuming alcohol only allowed on holidays had a lower incidence of new-onset hypertension. On the contrary, the 5-year BP change may increase greater with habitual smoking, though the risk of new-onset hypertension was not affected.

Substance use and incidence of metabolic syndrome before midlife among military adults: the CHIEF cohort study

Backgrounds

Habitual substance use, i. e., alcohol, tobacco and betel nut, has been found with an increased risk of metabolic syndrome (MetS) in the general population, whereas the association remains unclear in physically fit military personnel. This study aimed to investigate the combination of these substances use and their associations with new-onset MetS in the military.

Methods

A total of 2,890 military men and women, aged 18-39 years, without MetS were obtained from the cardiorespiratory fitness and health in eastern armed forces study (CHIEF) in Taiwan and followed for incident MetS from baseline (2014) through the end of 2020. Incident MetS event was defined by the International Diabetes Federation guideline and confirmed in the annual health examinations. A self-report was used to assess the alcohol, tobacco and betel nut use status (active vs. former/never). Multivariable Cox regression model was performed to determine the association with adjustments for sex, age, body mass index and physical activity at baseline.

Results

At baseline, there were 279 active betel nut chewers (9.7%), 991 active smokers (34.3%) and 1,159 active alcohol consumers (40.1%). During a mean follow-up of 6.0 years, 673 incident MetS (23.3%) were observed. As compared to no substance users, only one substance, and two and three substances users had a greater risk of incident MetS [hazard ratios (HRs) and 95% confidence intervals: 1.27 (1.06-1.54), 1.38 (1.12-1.69) and 1.78 (1.37-2.32), respectively]. In subgroup analyses, the risk of incident MetS in two and three substances users was significantly greater in those free of baseline low high-density lipoprotein [HRs: 1.54 (1.21-1.95) and 2.57 (1.92-3.46), respectively], as compared to their counterparts (both p for interactions <0.05).

Conclusion

A dose-response association of more substances use for new-onset MetS was noted in military personnel. This finding suggests that the combined alcohol, tobacco and betel nut use may play a role in the development of MetS. Further study is required to establish causation and to investigate the potential benefits of substance use cessation in reducing the risk of MetS.

Moderate or greater daily coffee consumption is associated with lower incidence of metabolic syndrome in Taiwanese militaries: results from the CHIEF cohort study

Background

Daily moderate coffee intake was found with a lower risk of specific metabolic abnormalities, e.g., hypertension and hyperglycemia, while the association of coffee intake and incident metabolic syndrome (MetS) has not been clarified in prior studies, particularly in young adults.

Methods

A total of 2,890 military personnel, aged 18-39 years, free of MetS were followed for incident MetS from baseline (2014) until the end of 2020 in Taiwan. Daily coffee amount consumed was grouped to those ≥3 cups or 600 mL (moderate or more amount) and those without. Incidence of MetS was identified in annual health examinations. MetS was diagnosed on the basis of the guideline of the International Diabetes Federation. Multivariable Cox regression model with adjustments for sex, age, body mass index, physical activity and substance use status at baseline was performed to determine the association.

Results

At baseline, there were 145 subjects with daily coffee intake ≥3 cups or 600 mL (5.0%) in the overall cohort. During a mean follow-up of 6.0 years, 673 incident MetS (23.3%) were found. As compared to those consuming less coffee or none, those consuming daily coffee ≥3 cups had a lower risk of MetS [hazard ratio (HR): 0.69 (95% confidence interval: 0.48, 0.99)].

Conclusion

This study suggests that adhering to the guideline recommended moderate or greater daily coffee consumption for promoting health, may confer advantages in preventing the development of MetS among young adults.

High risk for obstructive sleep apnea and risk of hypertension in military personnel: The CHIEF sleep study

BACKGROUND

Epidemiological studies have revealed an association between obstructive sleep apnea (OSA) and hypertension in the general population, while the association in military personnel was rarely investigated.

AIM

To examine the association between high risk for OSA and hypertension by phenotypes in military young adults.

METHODS

A total of 746 military personnel, aged 27.9 years, were included in the cardiorespiratory fitness and health in armed forces (CHIEF)-sleep study in Taiwan in 2020. Antihypertensive medications were not used by the subjects. High risk for OSA was assessed using the Berlin Questionnaire. Hypertension was defined using the 7th Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC 7) and the 2017 American College of Cardiology (ACC)/American Heart Association (AHA) guidelines. The cutoff levels of systolic and diastolic blood pressure (SBP and DBP) for the 2017 ACC/AHA- and JNC 7-based guidelines were 130/140 mmHg and 80/90 mmHg, respectively. Hypertension phenotypes included isolated systolic and diastolic hypertension (ISH, high SBP only and IDH, high DBP only) and combined hypertension (both high SBP and DBP). Multivariable logistic regression analysis with adjustment for demographics, lifestyle and metabolic biomarkers.

RESULTS

The prevalence of high risk for OSA, JNC 7-based hypertension and 2017 ACC/AHA-based hypertension were 8.0%, 5.2% and 22.0%, respectively. Those with a high risk for OSA had a higher probability of JNC 7-based overall and combined hypertension (odds ratios (ORs) and 95% confidence intervals: 2.82 (1.07-7.42) and 7.54 (1.10-51.54), although the probabilities of ISH and IDH were unaffected by a high risk for OSA (ORs: 1.96 and 2.35, respectively, both P > 0.05). In contrast, no associations for any hypertension phenotypes were found according to the 2017 ACC/AHA criteria.

CONCLUSION

A high risk for OSA was associated with severe hypertension and combined hypertension among Asian military young adults.

Erythrocyte indices and localized stage II/III periodontitis in military young men and women: CHIEF oral health study

Background

Prior studies have shown an association between generalized periodontitis and anemia in older or undernourished adults. The aim of the study was to examine the associations of erythrocyte indices with localized periodontitis in robust young adults, which has never been reported before.

Methods

The study included 1286 military participants, aged 19–40 years, with regular exercise training in Hualien, Taiwan. Localized periodontitis was grouped to healthy/stage I and stage II/III (n = 803 and 325) in men and (n = 130 and 28) in women according to the 2017 criteria of the world workshop. Systemic inflammation was evaluated by leukocyte counts. Multiple logistic regression analysis with adjustment for age, tobacco smoking status, betel nut chewing status, body mass index and leucocyte counts were used to determine the associations.

Results

Greater mean corpuscular volume in young men [odds ratio (OR) and 95% confidence intervals 1.03 (1.01–1.06)], and greater hematocrit and hemoglobin levels in young women were associated with a higher risk of localized stage II/III periodontitis [OR: 1.17 (1.02–1.34) and 1.60 (1.06–2.41), respectively]. However, there were no associations for erythrocyte counts.

Conclusions

The localized stage II/III periodontitis risk increased with greater erythrocyte indices in robust young adults. This finding could be explained in part by that localized periodontitis may promote physical stress, possibly resulting in an increase of erythrocyte indices. On the other side, greater physical fitness associated with a lower risk of periodontitis may consume iron storage in the body, leading to exercise-induced anemia or smaller erythrocyte volume.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12903-022-02455-0.