A Critical Review on New Approaches for Chronic Disease Prevention in Brazil and Canada: From Wholistic Dietary Guidelines to Physical Activity Security

In light of new evidence on the prevention of chronic diseases and the elevated rates of overweight and obesity in Brazil and Canada, this critical review aims to interpret and synthesize current aspects regarding dietary and physical activity initiatives in both countries and make future recommendations. The pioneering work presented in the last Brazilian dietary guidelines has been called a model that can be applied globally, given its conceptualization of healthy eating that translates easily to practical guidance. The new Canadian Food Guide has incorporated similar aspects, also putting the country as a leader in dietary guidance. With these new recommendations, citizens in both Brazil and Canada have access to impactful evidence-informed nutritional guidelines. Both documents propose eating patterns that focus not only on health benefits, such as chronic disease prevention, but also incorporate well-being concerning cultural, economic, sociodemographic, biological, and ecological dimensions. A similar approach is required for physical activity to allow individuals to have attainable health and life goals and thereby fully enjoy their lives, regardless of geographical location, health status, and socioeconomic condition, a concept recently described as physical activity security. The wholistic dietary guidelines from both countries represent a change in paradigm in public health. Likewise, national evidence-based policies are warranted to reduce disparities in physical activity, allowing healthier and more active lifestyles for everyone.

The impact of standing desks on cardiometabolic and vascular health

Sedentary behavior is associated with cardiovascular disease (CVD) and mortality, independent of physical activity. The biological mechanisms underlying these associations are largely unknown. We hypothesized that obese subjects with sedentary desk jobs, when assigned a sit-stand desk, will reduce daily sedentary time, and show improvement in arterial flow-mediated dilation (FMD), an early indicator of CVD. Overweight and obese subjects without known CVD were recruited at our institution and given an adjustable sit-stand desk at work. Activities were quantified with an accelerometer for 7 days at baseline and during the intervention. FMD of the brachial and superficial femoral arteries, fasting lipids, insulin and glucose labs, and anthropometrics were measured at baseline, and 12 and 24 weeks. Repeated one-way ANOVA tests were used to compare measurements over time. Fifteen participants were enrolled (93% female, mean age 40 ± 5 years, mean body mass index [BMI] 33 ± 5). Mean daily sedentary time at work decreased by 90 minutes from baseline (385 ± 49 minutes) to 12 weeks (297 ± 80 minutes, p = 0.002) and 24 weeks (295 ± 127 minutes, p = 0.015). Femoral FMD increased from baseline (4.9 ± 1.7%) to 12 weeks (6.4 ± 2.3%, p = 0.043) and further to 24 weeks (8.1 ± 3.2%, p = 0.009). Significant improvement in fasting triglycerides and insulin resistance occurred. There was no change in brachial FMD, exercise activity, step counts, weight, or BMI. A significant reduction in sedentary time during working hours was identified with utilization of a sit-stand desk and sustained over 24 weeks. Improvements in FMD, triglycerides, and insulin resistance provide insight into mechanisms of adverse health risks associated with sedentary behavior.

Improving Physical Activity and Body Composition in a Medical Workplace Using Brief Goal Setting

Objective

To evaluate the use of a wearable activity tracker and brief feedback in the workplace to motivate employees to improve activity.

Patients and Methods

A total of 135 adult participants were randomized to 1 of 3 groups: control group (blinded to their step activity), intervention group (received counseling based on their step count), or no step-tracking device group. Participants were recruited from June 27, 2016, through February 21, 2018.

Results

Most of the 135 participants were women (84%), with a mean ± SD age of 42.6±10.1 years. Most participants (96%) completed 11 of the 12 weeks of step counts. Comparing treatment groups at week 12 (end of treatment), the intervention group (vs the control group) had significantly more steps (644.8; P<.01), had an 11.1% increase in step count from baseline (P<.01), was more likely to achieve goal (odds ratio=1.73; P=.02), increased distance traveled per week (0.46 miles; P<.01) and calories burned (90.6; P<.01), and had a decrease in some bioelectrical impedance measurements over time, including a greater loss in body fat mass (–0.90 kg; P=.01), percentage fat (–0.96; P<.01), and visceral fat level (–0.60; P<.01). Finally, the intervention group indicated significantly greater satisfaction with their assigned randomization (89% vs 77%; P=.01) and greater confidence in the effectiveness of their activity tracker (P<.01).

Conclusion

Brief counseling accompanied by use of a step-counting device can improve workplace activity, which, in turn, can increase steps and decrease body fat, including visceral fat.

Trial Registration

clinicaltrials.gov Identifier: NCT02794727