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Dietary patterns related to total mortality and cancer mortality in the United States

Purpose This study investigated the association between dietary patterns, total mortality, and cancer mortality in the United States. Methods We identified the four major dietary patterns at baseline from 13,466 participants of the NHANES III cohort using principal component analysis (PCA). Dietary patterns were categorized into ‘prudent’ (fruits and vegetables), ‘western’ (red meat, sweets, pastries, oils), ‘traditional’ (red meat, legumes, potatoes, bread), and ‘fish and alcohol’. We estimated hazard ratios for total mortality, and cancer mortality using Cox regression models. Results A total of 4,963 deaths were documented after a mean follow-up of 19.59 years. Higher adherence to the ‘prudent’ pattern was associated with the lowest risk of total mortality (5th vs. 1st quintile HR 0.90, 95% CI 0.82–0.98), with evidence that all-cause mortality decreased as consumption of the pattern increased. No evidence was found that the ‘prudent’ pattern reduced cancer mortality. The ‘western’ and the ‘traditional’ patterns were associated with up to 22% and 16% increased risk for total mortality (5th vs. 1st quintile HR 1.22, 95% CI 1.11–1.34; and 5th vs. 1st quintile HR 1.16, 95% CI 1.06–1.27, respectively), and up to 33% and 15% increased risk for cancer mortality (5th vs. 1st quintile HR 1.33, 95% CI 1.10–1.62; and 5th vs. 1st quintile HR 1.15, 95% CI 1.06–1.24, respectively). The associations between adherence to the ‘fish and alcohol’ pattern and total mortality, and cancer mortality were not statistically significant. Conclusion Higher adherence to the ‘prudent’ diet decreased the risk of all-cause mortality but did not affect cancer mortality. Greater adherence to the ‘western’ and ‘traditional’ diet increased the risk of total mortality and mortality due to cancer.


Introduction
In the last decades, efforts have been made to quantify the burden of disease attributable to specific dietary factors [1][2][3]. The study of diet and disease associations has traditionally originated from the consumption of single nutrients or foods. Dietary patterns describe diet quality and explain the total variability in food intake [4,5]. Additionally, dietary patterns account for complex interactions that occur among foods and nutrients [6]. Therefore, the study of dietary patterns provides a clearer view of food and nutrient consumption and could better predict long-term outcomes such as mortality due to dietary exposure [7].
Several studies evaluated the effect of dietary patterns and mortality in other countries [8][9][10][11]. In the United States, studies have shown the association between adherence to specific dietary patterns and chronic diseases, including obesity [12,13], cardiovascular disease, and diabetes [14]. Moreover, only a few studies have investigated the relationship between specific dietary patterns and total mortality [15][16][17][18][19][20]. Most of these studies have focused on particular race and ethnicities [17], older adults [15,20], or participants with specific health conditions, such as chronic kidney disease [19]. Therefore, evidence of the association between adherence to dietary patterns and total mortality in the United States in the general population is still limited.
This study evaluates the association between dietary patterns, total mortality, and cancer mortality in the NHANES III adult cohort in the U.S. We hypothesize that dietary patterns characterized by consumption of nutrient-rich foods are associated with lower total mortality, and mortality due to cancer in the United States. Conversely, we hypothesize that dietary patterns that reflect poor nutrition are associated with higher total mortality and mortality due to cancer. We used data from 13,466 adults from the National Health and Nutrition Examination Survey III (NHANES III). We identified the predominant dietary patterns in relationship with total mortality and mortality due to cancer.

Study population
The study used data from the NHANES III, a nationally representative sample of the civilian, non-institutionalized U.S. population conducted between 1988 and 1994 by the National Center for Health Statistics (NCHS) of the Centers for Disease Control and Prevention (CDC). The NHANES study protocol obtained ethical approval from the CDC/ NCHS Ethics Review Board and received informed consent from all participants. The current study included 13,466 participants 18 to 90 years old, with complete data on mortality status, diet, and relevant covariates. The examination component involved examinations by a health professional, including physicians, dentists, and health technicians. Detailed information on the standardized protocols used in NHANES III has been previously published [21].

Assessment of dietary exposure
During the interviews, dietary records providing detailed information about the foods and beverages were collected using computer-assisted software. We followed the recommendation from the NHANES III dietary methodology committee to use the 24-h recall as the principal methodology to provide detailed quantitative food and nutrient intake assessment, and the food frequency questionnaire (FFQ) to supplement data from the 24-h recall to provide typical or qualitative data [22,23]. Therefore, the percentage of daily calories and macronutrients was calculated based on the information gathered during the 24-h food recall interview, and the usual diet assessment was based on the FFQ that included 60 food items and beverages. This was calculated in standardized portion sizes and nutrient intakes as grams per day. Participants without complete dietary data and those that reported excessively high or low values for total food or energy intake (less than 600 kcal/day in or more than 4,200 kcal/day) were excluded based on previously defined cut-offs [24][25][26]. Food groups were classified based on their nutrient profiles based according to the USDA Nutrient Lists from Standard Reference Legacy [27]. The food groups and items are shown in Table 1.

Assessment of covariates
The sociodemographic and lifestyle characteristics information was collected during the face-to-face household interview. The participants' characteristics included in the analysis were: age (years at the time of the recruitment); sex (male or female); educational attainment (years of schooling completed); and current smoking status (yes, no, or missed to answer). The medical history of chronic diseases, including ischemic heart disease, stroke, hypertension, diabetes, was also collected during the household interview. The variables were dichotomized as yes or no. The questions participants were asked were: "Has a doctor ever told you that you had a heart attack?"; "Has a doctor ever told you that you had a stroke?"; "Have you ever been told by a doctor or other health professional that you had hypertension, also called high blood pressure?"; "Have you ever been told by a doctor that you have diabetes?"; "Has a doctor ever told you that you had skin cancer?" and "Has a doctor ever told you that you had any other cancer?". The collection of anthropometric measurements during the physical examination included standing height and weight using standard protocols. We used these measurements to calculate body mass index (BMI) as kg/m 2 .

Statistical analysis
We used principal component analysis (PCA) to assess the major dietary patterns in the NHANES III cohort. We tested the sample adequacy for PCA using the Kaiser-Meyer-Olkin (KMO) test. We identified the major dietary patterns based on the components with eigenvalues greater than one and a confirmatory scree test (Fig. 1). Then, we calculated scores for each of the dietary patterns. Food groups with absolute scoring coefficients > 0.3 were considered substantial contributors to a pattern. We evaluated the distribution of population characteristics by quintiles of dietary pattern scores and tested for trend analysis. We used 1-way ANOVA for quantitative variables and Chi-square tests for qualitative variables to identify significant differences across quintile of dietary pattern scores.
After confirming the proportionality of hazards assumption, we used Cox regression models with the length of follow-up as the primary time variable to test the association between dietary pattern adherence and mortality due to all causes and mortality due to cancer. Hazard ratios (HR) with 95% confidence intervals (CI) across quintiles of dietary patterns were calculated using the lowest quintile of adherence as the reference category. In the multivariable models, potential confounders included as covariates were age, sex, total energy intake, smoking status, baseline BMI and previous history of chronic diseases (diabetes, hypertension, stroke, heart attack) and cancer. Also, tests of linear trend across successive quintiles of adherence to each pattern were conducted, treating the variable as continuous. We considered p values < 0.05 statistically significant. Sample weights were used to calculate population estimates to account for unequal probability of selection. All analyses were performed using STATA version 13.1.

Dietary pattern assessment
We identified four major dietary patterns, explaining 33% of the total variance in the food groups' consumption in the study population. The factor loadings are shown in Table 2. The first dietary pattern was named 'prudent' because it had a high score for vegetables, fruits, and a low score in meat and oils. The second dietary pattern was named 'western' since it was characterized by a high score for red meat, sweets, pastries, oils and low scores for vegetables and fruits. The third pattern was named 'traditional' because it had high scores in traditional foods, including red meat, eggs, legumes, potatoes, and bread. Finally, the fourth dietary pattern was labeled as 'fish and alcohol' due to the notably high score for alcoholic beverages compared to other foods, fish and seafood.

Demographic characteristics
The mean age of the 13,446 participants was 46.89 years. The mean follow-up of participants was 19.59 years, with a minimum and maximum follow-up of 0.10 and 27.2 years, respectively. During this period, 4,963 deaths were registered. The leading causes of death were cardiovascular disease (23.65%), cancer (21.89%), cerebrovascular disease (6.64%), and other reasons (47.8%). The mean age of death for the deceased participants was 64.10 years. In Table 3, the baseline characteristics of the participants are shown across the quintiles for the dietary patterns. On average, the participants with the highest adherence to the 'prudent' dietary pattern were more likely to be men, older, had more years of education, and were less likely to be current smokers. They were also less likely to have a previous history of stroke and cancer; they were leaner despite having a higher calorie intake; and they consumed higher amounts of fiber, carbohydrates, and protein and consumed a lower amount of fats and alcohol.
The participants with the highest adherence to the 'western' dietary pattern were more likely to be male, younger, current smokers, have a higher BMI, and have fewer years of education. Additionally, they were more likely to report a history of hypertension and cancer. On average, they had a higher caloric intake, higher consumption of total fat and alcohol, and lower protein consumption, carbohydrates, and dietary fiber.
Those with the highest consumption of the 'traditional' and the 'fish and alcohol' dietary patterns were more likely to be men, younger, current smokers, and have more years of education. Nonetheless, the participants with the highest adherence to the 'traditional' diet were less likely to have a previous history of chronic diseases, such as stroke, hypertension, and diabetes at baseline, probably due to their age. Those with the consumption of the 'traditional' pattern consumed less protein and more alcohol. And those with the highest consumption of the 'fish and alcohol' pattern had higher calorie intake and consumed more fats, protein, and alcohol.

Dietary patterns and total mortality
There were 4,963 deaths due to all causes among the 13,446 participants from NHANES III cohort. The results of the study showed that the lowest risk of total mortality The associations between adherence to the 'prudent' or the 'fish and alcohol' pattern and mortality due to cancer in the age-adjusted and fully adjusted models were not statistically significant. The HR and 95% CI for mortality due to cancer  Table 5.

Discussion
Most studies in the United States have focused on investigating associations between specific dietary factors and chronic diseases [12][13][14].The association between the adherence dietary patterns and total mortality and mortality due to cancer in the general population is still limited. Dietary patterns condense information about food consumption, reflect diet composition, and capture the overall effect of dietary exposures on health and disease. This study evaluated the association between dietary patterns, total mortality, and cancer mortality in the NHANES III adult cohort in the U.S. Four previously described dietary patterns were found in this study at baseline. The 'prudent' dietary pattern, with high intakes of vegetables, fish, fruits, and legumes [29][30][31][32][33]; the 'western' dietary pattern, rich in sweets and oils, and low in fruits and vegetables [29][30][31][32][33]; the 'traditional' dietary pattern, rich in bread, legumes, eggs; [34,35]; and the dietary pattern characterized by high consumption of alcoholic beverages [36,37]. On average, those with the highest consumption of the 'prudent' dietary pattern were more likely to adhere to healthier behaviors and less likely to report a previous history of chronic diseases and cancer, in contrast with the participants with the highest consumption of the other patterns. Previous studies support this evidence and demonstrate a correlation between dietary behaviors and lifestyle choices [38,39]. Our findings confirmed the hypothesis that dietary patterns characterized by consuming nutrient-rich foods are associated with lower total mortality, and dietary patterns that reflect poor nutritional habits are associated with higher total mortality. Herein, the lowest risk of total mortality was among those with the highest adherence to the 'prudent' dietary pattern. The 'prudent' pattern is characterized by consuming nutrient-rich foods high in antioxidants and vitamins. Prudent diets contain a complex combination of antioxidant and prooxidant elements that can modify the human body's oxidative status. The oxidative stress resulting from imbalances between reactive oxygen species and the antioxidant defense is a common factor in many pathological conditions [40]. Oxidative stress has been related to cardiovascular disease, cancer, and other chronic diseases that account for a significant portion of deaths in the United States [41].
In this study, participants with the highest consumption of the 'western' dietary pattern showed the highest risk of total mortality. The 'western' dietary pattern with high consumption of sweets and oils and low consumption of vegetables and fruits was associated with an increased risk of chronic diseases and cancer, probably due to micronutrient deficiencies that lead to several pathophysiological events increase the risk of chronic disease. Westernized diets are known to be deficient in magnesium, zinc, folate, and vitamins C, E, and K [42,43]. Deficiencies in the micronutrients above were previously related to metabolic syndrome [44], cardiovascular disease [45,46], and coronary heart disease [47,48], which are principal causes of mortality in the U.S. Our findings did not show an association between the 'traditional' or the 'fish and alcohol' pattern and total mortality. The 'traditional' dietary pattern has not been extensively studied in the United States, where traditional foods, inherited from the native communities, served as the foundation for the contemporary diet. Nonetheless, acculturation led to increasing consumption of a westernized diet in native communities, increasing chronic diseases [49]; therefore, more research is needed to understand the factors that influence the adherence to the 'traditional' diet and its effects on health and mortality. Alcohol consumption has been previously linked with increased mortality; nonetheless, the harmful effects depend on the level of alcohol consumption and the amount of time that individuals consume alcoholic beverages [50,51]. Furthermore, these effects depend on individuals' characteristics, such as their age and cardiovascular health [52,53]. In line with these findings, our study showed that individuals with the highest adherence to the alcohol pattern were younger and less likely to have a previous history of chronic diseases and cancer. Moreover, the harmful effects of alcohol consumption, for those with the highest adherence to the 'fish and alcohol' dietary pattern, may have been compensated by the high intake of fish and seafood, which has been linked with positive health outcomes such as reduced cardiovascular risk [54], and allcause mortality [55].
We partially confirmed our second hypothesis and provided evidence that dietary patterns that reflect lower quality nutrition are associated with higher cancer mortality. Our findings suggest that participants with the highest consumption of the 'western' and the 'traditional' dietary pattern had the highest risk of mortality due to cancer, probably due to the high consumption of fats. Carrol and colleagues reviewed experimental and epidemiological studies on the role of dietary fat and cancer. Their findings suggested that high-fat diets increase cancer risk, and total dietary fat correlates with cancer mortality [56]. Similar findings were found across different types of cancers [57,58]. This study found no association between adherence to the 'prudent' or the 'fish and alcohol' pattern and cancer mortality. Diets rich in fruits and vegetables are widely considered beneficial to health since they contain antioxidants, vitamins, and dietary fiber responsible for the benefits.
Nonetheless, the results of several studies have been inconsistent in the association between the consumption of fruits and vegetables and cancer risk. Additionally, a recent meta-analysis indicated that higher consumption of fruits and vegetables was not significantly associated with cancer mortality risk [59]. The evidence presented herein suggests that efforts to increase consumption of a 'prudent' dietary pattern may reduce the risk of total mortality, and the benefit for cancer mortality remains possible.

Strengths and limitations
This study's key strengths include the long length of followup time and the large nationally representative sample of adults in the United States that were included. Furthermore, it is the first study investigating the role of adherence to dietary patterns and total mortality, and cancer mortality in the United States, to the best of our knowledge. Nonetheless, the study has limitations. First, the study used self-reported data that could be subject to recall bias due to the lack of medical records validation to confirm the medical diagnoses. Second, residual confounding may also be a limitation due to unmeasured socioeconomic variables. Finally, the study analyzed baseline dietary information and did not capture information about diet changes over time.

Conclusion
In this nationally representative cohort, adherence to the 'western' and the 'traditional' dietary pattern was strongly associated with an increased risk of total mortality and mortality due to cancer. The 'prudent' dietary pattern was associated with a decreased risk of total mortality, but not due to cancer. The evidence presented herein suggests that efforts to increase consumption of a 'prudent' dietary pattern may reduce the risk of total mortality, and the benefit for cancer mortality remains possible.
Author contributions ME was responsible for the study design, statistical analysis, and writing the paper. DS was responsible for providing comments on the writing, methodology, and results. RC was responsible for supervising the work. All authors read and approved the final manuscript.
Funding Not applicable.

Data availability Not applicable.
Code availability Not applicable.