How Eating Fruit Affects Body Fat and Heart Health Markers

Greg Howard
16th August, 2024

How Eating Fruit Affects Body Fat and Heart Health Markers

Image Source: Natural Science News, 2024

Key Findings

  • The study analyzed data from 365,534 middle-aged adults in the UK to explore the health impacts of fruit consumption
  • Higher fruit intake was linked to slightly better health metrics, including lower waist circumference and diastolic blood pressure
  • The beneficial effects of fruit on health markers were modest and influenced by other lifestyle and dietary factors
Cardiovascular disease (CVD) remains a leading cause of mortality worldwide, and understanding the role of diet in mitigating its risk is crucial. Fruit consumption has been linked to lower CVD risk, but the mechanisms behind this association are not well understood. A recent study conducted by researchers at the University of Oxford aimed to investigate the connections between fruit consumption and various health markers, including adiposity, blood pressure, lipids, inflammation, glycaemia, and oxidative stress[1]. The study analyzed data from 365,534 middle-aged adults from the UK Biobank. Participants' fruit consumption frequency was assessed using a questionnaire. The researchers evaluated the cross-sectional and prospective associations of fruit intake with several health markers, including body mass index (BMI), waist circumference, body fat percentage, systolic and diastolic blood pressure, lipid profiles, glycaemia (measured by haemoglobin A1c), low-grade inflammation (C-reactive protein), and oxidative stress (gamma-glutamyl transferase). Initial analyses showed weak inverse associations between fruit consumption and most health markers at baseline, meaning higher fruit intake was generally linked to slightly better health metrics. However, these relationships were not robust over time. Notable exceptions were diastolic blood pressure, C-reactive protein, gamma-glutamyl transferase, and adiposity, where inverse associations persisted through follow-up. Specifically, higher fruit consumption was associated with marginally lower waist circumference and diastolic blood pressure at the first follow-up. The study's findings align with earlier research indicating that fruit consumption can contribute to reduced adiposity and lower inflammation, both of which are risk factors for CVD. For instance, a review of randomized controlled trials and prospective cohort studies found that whole fruit consumption reduces the risk of long-term weight gain, likely due to a reduction in total energy intake[2]. Additionally, a systematic review and meta-analysis highlighted that higher intakes of fruits and vegetables decrease circulating levels of inflammatory markers like C-reactive protein and tumor necrosis factor-α, and enhance immune cell profiles[3]. Moreover, the current study's results are consistent with research showing that specific fruits have beneficial effects on metabolic health. For example, blueberry supplementation has been found to significantly decrease diastolic blood pressure and improve lipid profiles, which are critical factors in managing metabolic syndrome (MetS)[4]. Furthermore, research has shown that increased consumption of fruits and non-starchy vegetables is inversely associated with weight change, with high-fiber, low-glycemic-load fruits and vegetables being more effective in promoting a healthy weight[5]. Despite these promising findings, the differences in health markers observed in the current study were small, with most mean levels varying by less than 0.1 standard deviations between high and low fruit consumption groups. This suggests that while fruit intake does have beneficial effects, these effects may be modest and influenced by other lifestyle and dietary factors. The study highlights the importance of considering confounding factors and the need for future research to explore other potential mechanisms by which fruit consumption may reduce CVD risk. Detailed assessments of dietary patterns, energy intake, and other lifestyle factors are essential to fully understand the role of fruit in cardiovascular health. In conclusion, while the study by the University of Oxford adds to the body of evidence supporting the health benefits of fruit consumption, it also underscores the complexity of dietary influences on cardiovascular risk. The modest associations observed suggest that while fruit is a valuable component of a healthy diet, it should be part of a broader strategy that includes other dietary and lifestyle modifications to effectively reduce CVD risk.

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References

Main Study

1) Associations of fruit intake with adiposity and cardiometabolic biomarkers in UK Biobank.

Published 16th August, 2024

Journal: BMC public health

Issue: Vol 24, Issue 1, Aug 2024

Related Studies

2) Fruit consumption and adiposity status in adults: A systematic review of current evidence.

https://doi.org/10.1080/10408398.2015.1012290

3) Effects of fruit and vegetable consumption on inflammatory biomarkers and immune cell populations: a systematic literature review and meta-analysis.

https://doi.org/10.1093/ajcn/nqy082

4) Blueberry intervention improves metabolic syndrome risk factors: systematic review and meta-analysis.

https://doi.org/10.1016/j.nutres.2021.04.006

5) Changes in Intake of Fruits and Vegetables and Weight Change in United States Men and Women Followed for Up to 24 Years: Analysis from Three Prospective Cohort Studies.

https://doi.org/10.1371/journal.pmed.1001878


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