Study Examines Long-Term Effects of the Nordic Diet on Weight Management
Overview of the Nordic Diet
A recent study investigated the relationship between adherence to the Nordic diet and long-term changes in weight, waist circumference, and body mass index (BMI). The Nordic diet, characterized by its focus on traditional foods from Nordic countries, emphasizes the use of locally sourced ingredients, including fish, grains, vegetables, and berries. This diet is recognized for its eco-friendly approach, balancing nutritional value with sustainability.
Nordic vs. Mediterranean Diet
Both the Nordic and Mediterranean diets are noted for their effectiveness in promoting weight loss. However, they differ significantly. While the Mediterranean diet typically utilizes olive oil, the Nordic diet favors canola and rapeseed oils. Additionally, the Nordic diet excludes processed foods and red meat, promoting home-cooked meals rich in proteins, complex carbohydrates, and healthy fats.
The Growing Concern of Obesity
Global Epidemic of Overweight and Obesity
Obesity has become a significant global health concern, with rising rates of overweight individuals. Research indicates that weight gain is linked to an increased risk of various health issues, including coronary heart disease, type 2 diabetes, some cancers, hypertension, and more. Over the past 30 years, dietary changes have led to higher consumption of fats, meats, added sugars, and larger portion sizes. Enhanced access to unhealthy food and reduced physical activity have also contributed to the growing prevalence of obesity.
Need for Dietary Change
In light of the current obesity epidemic, there is an urgent need to adopt dietary patterns that support achieving or maintaining a healthy body weight.
Nordic Diet’s Role in Weight Loss
Effectiveness of the Nordic Diet
An increasing number of diets have proven effective for weight loss, and the Nordic diet is among them. Several studies suggest that this diet, featuring foods traditionally consumed in Denmark, Finland, Iceland, Norway, and Sweden, may aid in weight loss and lower BMI. Some research has indicated that adherence to the Nordic diet correlates with a reduction in waist circumference and improvements in heart health. However, further investigation is needed to fully understand the diet’s impact on weight loss and maintenance.
Study Design and Methodology
A recent study published in the British Journal of Nutrition analyzed the association between the healthy Nordic diet and long-term changes in weight, BMI, and waist circumference. The study tracked adherence to the Nordic diet not only at the outset but also throughout a seven-year follow-up period. Researchers aimed to assess the consistency between self-reported and nurse-measured values of height, weight, and waist circumference. The study involved 5,024 participants from Finland, aged 25 to 75 years, with one-third evaluated through health examinations and food frequency questionnaires. The remaining participants received measuring tapes and food questionnaires to self-report their measurements.
Assessment of Adherence
The Baltic Sea Diet Score (BSDS), a tool developed for evaluating healthy eating in Nordic countries, was employed to assess participants’ adherence to the Nordic diet. Scores ranged from 0 to 25, with higher scores reflecting greater adherence. Statistical analyses were conducted to evaluate the relationship between diet scores at the beginning of the study and changes in weight, BMI, and waist circumference during the follow-up.
Findings on Weight Maintenance
Impact of Adherence on Weight Changes
The study’s findings revealed that lower adherence to the Nordic diet at the start was associated with a greater increase in weight, BMI, and waist circumference. Conversely, participants who adhered closely to the Nordic diet either lost weight or maintained their weight throughout the follow-up period. Additionally, those who increased their adherence during the study showed better weight maintenance or reductions in weight and BMI, although no correlation was found between increased adherence and changes in waist circumference.
Reliability of Measurements
Researchers noted a strong correlation between nurse-measured values and self-reported data for height, weight, and BMI, indicating that both sets of values were reliable for analysis. Other strengths of the study included a high participation rate of 82% and a diverse sample from the general Finnish population. However, the authors acknowledged that the use of food frequency questionnaires might lead to value overestimation, potentially causing misclassifications.
Conclusion and Future Research
Importance of Adherence
The researchers concluded that adherence to the Nordic diet is crucial for long-term weight maintenance. Notably, a combination of high initial adherence and increased adherence over the seven years significantly promoted weight maintenance. Aligning with previous research, a healthy Nordic diet rich in fruits, vegetables, whole grains, fish, and nuts—while excluding processed foods—can effectively prevent overweight and obesity. The authors advocate for further studies to confirm the benefits of consuming a healthy Nordic diet.
Written by Preeti Paul, MS Biochemistry
Reference: Noora Kanerva et al. Adherence to the healthy Nordic diet is associated with weight change during 7 years of follow-up. British Journal of Nutrition (2018), 120, 101-110. Doi:10.1017/S0007114518001344
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