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Dietary changes associated with improvement of metabolic syndrome components in postmenopausal women receiving two different nutrition interventions

Rodriguez-Cano, Ameyalli MCN; Mier-Cabrera, Jennifer PhD; Balas-Nakash, Margie MSc; Muñoz-Manrique, Cinthya MSc; Legorreta-Legorreta, Jennifer BS; Perichart-Perera, Otilia PhD, RD

Author Information
doi: 10.1097/GME.0000000000000400
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Metabolic syndrome (MetS) is a cluster of interrelated metabolic abnormalities characterized by abdominal obesity, hypertension, high levels of triglycerides (TG), low high-density lipoprotein (HDL) cholesterol levels, impaired glucose metabolism, and a prothrombotic and proinflammatory state. The prevalence of MetS in the adult population is 20% to 30% in most countries.1 In Mexico, its prevalence has been reported to be 36.8%, with a higher prevalence in women (42.2%). In women aged 50 to 59 years, most of whom have already gone through menopause, the prevalence of obesity and abdominal obesity is highest.2 Because of hormonal and metabolic changes in these women, body weight increases and visceral fat accumulates. Insulin, total cholesterol, low-density lipoprotein (LDL) cholesterol, and HDL cholesterol concentrations are usually altered in postmenopausal women, with a 60% higher risk of having MetS.3

Even for women receiving pharmacologic treatment, lifestyle changes are not only the starting strategy but also the foundation for MetS treatment. Lifestyle management of MetS should focus not on transient modifications but on permanent changes.4 Lifestyle changes that focus on diet and physical activity can successfully modify both metabolic and cardiovascular risk factors.5,6

Promotion of healthy dietary behaviors has become the cornerstone of the prevention and treatment of obesity and MetS. A variety of individual foods and nutrients (eg, fats, meat, fruits, vegetables, fish, and dietary fiber) have been reported to be associated with MetS, but evidence is still scarce.7

A Western dietary pattern has been associated with increased risk of MetS. On the other hand, a diet characterized by higher intakes of fruits/vegetables, whole grains, fish, low-fat milk, and dairy have shown favorable effects on metabolic abnormalities.4,8-12 Mediterranean and Dietary Approaches to Stop Hypertension dietary patterns have been associated with benefits for some MetS components.4,13-15

The effects of changes in specific dietary behaviors on MetS components within a clinical intervention have not been studied in depth. In a recent clinical trial, Perichart-Perera et al16 compared a structured hypocaloric diet with a behavioral therapy (BT) intervention in Mexican postmenopausal women with MetS. An important and significant decrease in MetS prevalence was observed in each group after 6 months, and significant improvements in weight and waist circumference were found in both groups. Differences in metabolic outcomes were observed between groups. The remaining question is whether achievement of specific target dietary behaviors within a nutrition intervention results in positive metabolic outcomes. This article presents the results of a dietary analysis within a clinical trial to evaluate the association between positive dietary changes and improvement of individual MetS components in postmenopausal women.


Ethics and study participants

This study was conducted according to the guidelines laid down in the Declaration of Helsinki. The Institutional Review Board at the Instituto Nacional de Perinatología “Isidro Espinosa de los Reyes” (Mexico City, Mexico) approved all procedures involving human participants. A written informed consent form was obtained from all participants.


Postmenopausal women were included if they were overweight or obese (body mass index ≥25 kg/m2) and had MetS (three or more Adult Treatment Panel III risk criteria).17 Women were excluded if they had type 2 diabetes mellitus (T2DM) or a fasting glucose concentration higher than 126 mg/dL (7.0 mmol/L), had thyroid problems, or were taking medications that may affect nutrient metabolism or absorption.


Between 2005 and 2009, women were selected by convenience at the postmenopausal clinic of the Instituto Nacional de Perinatología “Isidro Espinosa de los Reyes,” where they were receiving medical treatment.

During the first visit, a clinical dietitian—using a random number list and sequentially numbered files—randomly assigned women (simple randomization) to study groups (parallel design). Both the dietitian and gynecologists were blinded to allocation schedule. The recruitment protocol included an initial visit where suitability for randomization was evaluated and women were invited to participate.

Women were allocated into two groups:

  • Group 1: women received a structured hypocaloric diet with serving sizes based on cardioprotective dietary recommendations (25%-35% fat intake; <7% saturated fat intake; increased intake of monounsaturated and polyunsaturated fat; fiber 25-30 g/d; high intake of fruits/vegetables [≥5 servings daily], whole grains, low-fat animal products, healthy fats [avocado, canola oil, and seeds]; and low intake of high-energy refined grains, red and processed meats, added sugars, and soda and sweetened beverages). They received lifestyle recommendations and established a physical activity goal of 30 minutes three times a week.
  • Group 2: women did not receive a structured diet but received a BT intervention. They were evaluated using a traffic-light questionnaire (details of dietary risk assessment were published recently), where dietary and lifestyle behaviors associated with cardiovascular disease were included.16 The main objective was to gradually promote a change in these behaviors from the high-risk category (red light) to the low-risk category (green light). Based on the risk factors detected, short-term goals were established for the next visit. To improve success in goal achievement, we used other behavioral strategies such as problem solving and stimulus control.

In both groups, initial visits lasted 60 to 70 minutes, and follow-up visits were 45 minutes long. All measurements (metabolic assessment: blood pressure, fasting glucose, total cholesterol, HDL cholesterol, LDL cholesterol, and TG; nutrition assessment: weight, height, waist circumference, and 24-h food recalls) were performed at baseline and after 2, 4, and 6 months of intervention. Both groups received routine medical care and the same individual nutrition education at each visit.

Dietary assessment

Dietary assessment was performed using a five-step multiple-pass 24-hour recall.18 Estimation of food servings was performed using measuring cups and spoons, and food replicas (Life/Form; Nasco, Fort Atkinson, WI). The Food Processor SQL software (version 10.4, 2008; ESHA Research), which included Mexican foods, was used for nutrient analysis. Missing foods were added using the Mexican Food Exchange System19 or food labels.

Daily intake of high-fat dairy, high-energy refined grains, soda and sweetened beverages, added sugars, low-fat dairy, and fruits/vegetables was recorded as the number of servings using the Mexican Food Exchange System. In addition, cardioprotective dietary goals20,21 were established on a daily basis as follows: (a) fruits/vegetables (≥5 servings); (b) high-fat dairy (0 servings); (c) low-fat dairy (≥1 servings); (d) added sugars and sweetened beverages (<100 kcal); and (e) high-energy refined grains (0 servings).

MetS components

Adequate metabolic status was considered when women achieved optimal blood pressure (systolic blood pressure <130 mm Hg, diastolic blood pressure <85 mm Hg), optimal blood lipid concentrations (total cholesterol <200 mg/dL, HDL cholesterol >50 mg/dL, LDL cholesterol <130 mg/dL, TG <150 mg/dL), normal fasting glucose (<100 mg/dL), and/or adequate waist circumference (<88 cm; Adult Treatment Panel III). Methods for analyzing each metabolic marker have been described elsewhere.16

Statistical analysis

Analysis included data from all women in the study. Last-observation-carried-forward imputation data were assumed when women were lost to follow-up. Dietary data were analyzed at baseline (T0), 2 months (T1), 4 months (T2), and 6 months (T3). Except for baseline, two multiple-pass 24-hour recalls were averaged for each observation period.

Descriptive statistics and frequencies were performed for all variables. Mean differences were analyzed using Student’s t test or Mann-Whitney U test to assess correct randomization and to compare changes in food intake (T3T0). χ2 test and Fisher’s exact test were used to evaluate the association between the number of women who achieved dietary goals and the number of women who had adequate metabolic status (both independent observations). McNemar’s test was used to evaluate change in the number of women who met dietary goals from baseline to the end of the study. Repeated-measures analysis of variance was performed to assess food intake changes throughout the intervention. Multiple logistic regression models were used to evaluate the association between change in food intake and each metabolic goal, adjusting for confounding factors (energy intake, use of medication, study group, and/or baseline value).

P ≤ 0.05 was considered statistically significant. Statistics were performed with the Statistical Package for the Social Sciences software (version 17.0, 2008; SPSS Inc).


We approached 528 women; 357 women did not meet the inclusion criteria or were excluded, and 53 women refused to participate. A total of 118 women met our eligibility criteria and agreed to participate; 63 women were randomly assigned to group 1, and 55 women were randomly assigned to group 2 (Fig.).

Flow chart.

As previously reported, the mean (SD) age of our population was 53.81 (6.43) years (range, 40-75 y). At baseline, the most frequent metabolic alteration was increased waist circumference (97.4% of women). The second most frequent alteration was increased HDL cholesterol (86.4%), followed by increased TG (82.1%) and total cholesterol (78.6%). The least altered MetS component was systolic blood pressure (46.4%). There were no baseline differences in metabolic, clinical, or dietary data between groups.16

At the beginning of the study, 75% of all women consumed 3 or fewer servings of fruits, 2.5 or fewer servings of vegetables, and 1 or fewer servings of low-fat dairy daily. Both groups started with similar food serving intake, except for vegetables (P = 0.044; Table 1). The proportions of women who met established cardioprotective dietary goals at baseline were as follows: fruits/vegetables, 33.1%; high-fat dairy, 35.5%; low-fat dairy, 41.5%; added sugars and sweetened beverages, 39.8%; high-energy refined grains, 41.5%. No differences were observed between groups, except for fruits/vegetables and high-energy refined grains (Table 2).

Food servings eaten at the beginning of, during, and at the end of the study
Women meeting cardioprotective recommendations before and after intervention

Throughout the study, women in both groups significantly decreased energy intake, total fat intake, saturated fat intake, and added sugars intake (data not shown).16 Women in group 1 increased their intake of fruits (P = 0.005) and low-fat dairy (P = 0.001), and decreased their intake of high-fat dairy (P = 0.002), high-energy refined grains (P < 0.001), added sugars (P = 0.011), and soda and sweetened beverages (P = 0.005). Women in group 2 increased their intake of vegetables (P = 0.001) and decreased their intake of added sugars (P = 0.003) and soda and sweetened beverages (P < 0.001). There were no between-group differences in change in food serving intake after 6 months of intervention, except for a greater decrease in high-energy refined grains observed in group 1 (P = 0.013; Table 1).

At the end of the intervention, there was a significant increase in the number of women who met the following dietary goals: five or more servings of fruits/vegetables, one or more servings of low-fat dairy, and less than 100 kcal from added sugars and soda and sweetened beverages in both groups. In group 1, a higher proportion of women eliminated intake of high-energy refined grains. Some differences were observed between groups. In group 1, more women met the recommended intake of high-fat dairy and low-fat dairy; in group 2, more women achieved the five-a-day recommendation for fruits/vegetables (Table 2).

In group 1, significant positive correlations were observed between intake of high-energy refined grains and waist circumference (r = 0.324; P = 0.010), high-fat dairy intake and HDL cholesterol (r = 0.255; P = 0.044), and low-fat dairy intake and fasting glucose (r = 0.279; P = 0.031). Women who ate one or more servings of low-fat dairy had lower mean (SD) diastolic blood pressure (≥1 serving vs <1 serving: −4.6735 [10.18] vs 6.8571 [9.58] mm Hg; P = 0.012) and higher mean (SD) HDL cholesterol (≥1 serving vs <1 serving: +1.6178 [8.41] vs −7.9071 [5.99] mg/dL; P = 0.001). In this same group, women who did not eat any high-energy refined grains had greater probability of having normal fasting glucose (relative risk, 1.514; 95% CI, 0.989-2.316; P = 0.035).

In group 2, significant correlations were observed between intake of high-energy refined grains and body weight (r = 0.266; P = 0.049), intake of low-fat dairy and systolic blood pressure (r = 0.325; P = 0.017), and intake of high-fat dairy and total cholesterol (r = 0.349; P = 0.009), LDL cholesterol (r = 0.274; P = 0.043), and TG (r = 0.307; P = 0.023). Women who did not eat any high-fat dairy had a greater probability of having a fasting glucose level lower than100 mg/dL (relative risk, 1.915; 95% CI, 1.123-3.266; P = 0.026); those who ate five or more servings of fruits/vegetables had greater probability of having altered LDL cholesterol, although this last odds was not statistically significant (relative risk, 1.583; 95% CI, 0.951-2.637; P = 0.040).

Multivariate analysis

In all women, exclusion of high-fat dairy from the diet decreases by 60% the probability of having impaired fasting glucose (>100 mg/dL; relative risk, 0.40; 95% CI, 0.181-0.906; P = 0.028). The model was adjusted by energy intake and study group.


This study presents new evidence showing that two different nutrition interventions promote positive dietary changes that modify MetS components in postmenopausal women. Overall, these two nutrition interventions were effective in achieving the recommended intakes of fruits/vegetables, low-fat dairy, added sugars, soda and sweetened beverages, and/or high-energy refined grains. The observed improvements in food intake throughout the intervention seem to have positive effects on metabolic components such as glucose, blood pressure, and HDL cholesterol.

Our findings on fruits/vegetables intake and lipid profile may seem contradictory. Women in group 2, who ate at least five servings of fruits/vegetables daily, were more likely to have altered LDL cholesterol, although this probability did not reach statistical significance. In Mexico, intake of high-glycemic-index fruits is very frequent, and this factor could influence the effect on LDL cholesterol. Some evidence has shown an inverse association between dietary glycemic index/glycemic load and total cholesterol and LDL cholesterol22,23; this effect has been reported in Hispanic postmenopausal women.24 Another factor that may affect this association is the fact that we quantified total fruits/vegetables intake without specifying type or preparation. In Mexico, it is common to eat fruits with yogurt, honey, or syrups; thus, the addition of other foods, such as high-fat dairy and added sugars, may be exerting a negative effect on LDL cholesterol. On the other hand, some studies have reported a lack of effect of increased fruits/vegetables intake on lipid profile in the studied population.25

We also found a higher probability of achieving normal fasting glucose at 6 months with elimination of high-energy refined grains from the diet (not statistically significant); the intake of these types of grains also correlated positively with waist circumference. Refined grains tend to be high in energy and low in nutrient density (fiber, magnesium, vitamin D, folic acid, and potassium) and may be associated with insulin resistance and excess weight.26 Fiber may act in a protective manner by slowing absorption and digestion of carbohydrates, leading to a reduced demand for insulin and lowering glucose responses.27 In previous studies, high intake of refined grains has been associated with insulin resistance, higher waist circumference, and various components of MetS, leading to higher risk of T2DM and cardiovascular disease.26,28

We observed that avoiding consumption of high-fat dairy decreases by 60% the risk of having impaired fasting glucose, after adjusting for energy intake and study group. This finding is in line with the fact that promoting the exchange of high-fat dairy to low-fat dairy may be a promising strategy for preventing and/or controlling T2DM. Overall, there is evidence for the beneficial effect of dairy intake on glucose homeostasis. Observational studies have found that eating higher amounts of dairy products decrease the risk of T2DM by 8% to 14%.29,30 In other clinical trials, a high-dairy diet (≥3 servings) resulted in improved insulin sensitivity, lower plasma insulin, decrease in total body fat, decrease in waist circumference, decrease in trunk fat, and increase in lean mass.30 Dairy products are good sources of vitamins (A, D, K2, B12, and riboflavin) and minerals (calcium, magnesium, and potassium), which may play a role in insulin sensitivity and/or resistance. The protective effect of dairy products could also be explained by their whey content, which may stimulate insulin secretion.29,31,32 Another link could be that, in addition to medium-chain saturated fatty acids, dairy fat contains bioactive lipids, including conjugated linoleic acid, that have the potential to improve insulin resistance.33-35

Another finding was the positive correlation between high-fat dairy and blood lipids. Whole-fat dairy products are a major source of saturated fat, which has been associated with higher risk of MetS and cardiovascular disease, mainly by increasing total cholesterol and LDL cholesterol in blood. Although some studies have found higher concentrations of total cholesterol and LDL cholesterol with a high-fat dairy diet versus a low-fat dairy diet,36 the latest evidence has failed to demonstrate this link.30,37,38 Further research is needed to clarify the role of different bioactive substances in dairy products and their interactions with other macronutrients in the diet.36

The BT intervention (group 2) was designed to promote gradual behavioral change and was conducted according to individual women’s baseline food behaviors and their motivation to commit to specific diet and lifestyle goals. BT is an excellent approach that may promote healthy dietary behaviors, similar to a stricter, less individualized diet intervention. Increasing evidence highlights the importance of including behavioral and motivational strategies to improve adherence because the latter remains an issue of concern when treatment involves diet and/or exercise.39 Women in the BT group were able to meet similar dietary goals (fruits/vegetables, low-fat dairy, and sugars) as women following the structured hypocaloric diet. Considering these results, the BT intervention seems to be an excellent approach to promoting cardioprotective dietary behaviors.

The main limitation of this study is the small sample size. The primary outcome of the clinical trial was the effectiveness of two different dietary strategies on the prevalence of MetS, and not the achievement of specific dietary changes that influence MetS components. Therefore, the sample size in each group and the low event rates may partially explain some inconsistent findings from this study and the difficulty of establishing strong associations. The observed associations from bivariate analysis may be confounded, but the study did not have enough power to conduct multivariate analysis. In addition, we could not perform cluster or factor analysis to evaluate dietary patterns. This methodology would have been ideal because we do not eat isolated nutrients but a variety of foods that are consumed in many complex combinations and may synergically interact to reduce MetS risk. We analyzed foods as separate entities and how they can affect some biochemical makers, and this relationship may be confounded by other factors.

On the other hand, our dietary data were obtained by two 24-hour recalls. Although a well-trained dietitian uses food replicas, kitchen utensils, and other methods to help reduce bias in serving estimation, this method relies mainly on the participant’s memory. The multiple-pass methodology has been shown to improve the accuracy of recalls.40 Finally, underreporting may be an issue. When nutrition education is given within a period, it is probable that the individual may be reporting what she learned rather than what she ate.41 Another limitation is the lack of long-term data. It would have been interesting to evaluate whether the dietary goals achieved could be maintained for a longer period and whether the BT intervention would promote better sustainment of the observed behaviors.

The different associations between dietary and metabolic changes observed in both study groups should be taken into consideration when designing nutrition interventions. Nutrition care at clinic level should be flexible, with individualized dietary recommendations based on metabolic risk factors.


A structured hypocaloric diet and a BT intervention promote achievement of cardioprotective dietary goals for fruits/vegetables, sugars, soda and sweetened beverages, low-fat dairy, and high-energy refined grains, which result in improvement of some MetS components.

Elimination of high-fat dairy from the diet decreases the risk of impaired fasting glucose, independent of total energy intake and the nutrition intervention.

Dietary strategies should be flexible and individualized based on metabolic risk factors. Empowerment to achieve self-confidence and to develop motivation is essential for promoting healthy food choices and behavioral change.


We would like to thank Dr. Karime Haua, Dr. Felipe Vadillo, LN Ana Licea, LN Lorena Pantoja, LN Marien Garza, Química Ma. Antonia Hernández Miranda, Dr. Guillermo Ortiz, Dr. Roberto Silvestri, and Dr. Rafael Aguilera for their support.


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Cardiovascular risk; Menopause; Eating behaviors; Food servings; Cardioprotective diet

© 2015 by The North American Menopause Society.