Spending hours sitting at a desk, in a car, or on the sofa has become a part of modern life, but it can take a serious toll on your health. Prolonged sitting increases the risk of obesity, type 2 diabetes, heart disease, back pain, weak muscles, and poor posture.

However, recent research suggests that simple dietary choices could help offset some of these risks, even during extended periods of inactivity.

How sitting affects vascular health

Sitting for long periods reduces the ability of blood vessels to function properly. Even a small drop of 1 percent in vascular function, measured through flow-mediated dilatation (FMD), can increase the risk of cardiovascular problems such as strokes, heart attacks, and heart disease by 13 percent.

A study from the University of Birmingham explored whether certain foods, particularly those high in flavanols, could protect the heart and blood vessels from the effects of uninterrupted sitting. Flavanols are found in foods such as cocoa, tea, berries, and apples. The research was published in the Journal of Physiology.

What the study involved

The study examined the effects of flavanols during a two-hour sitting period with forty healthy young men. Participants were divided into two groups based on fitness levels, with twenty fitter men and twenty less fit men.

Each participant consumed either a high-flavanol cocoa drink containing 695 mg of flavanols or a low-flavanol cocoa drink containing only 5.6 mg before sitting.

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Women were not included in the study because oestrogen fluctuations can affect how flavanols influence vascular function, although this should be explored in future research.

The results showed that participants in both fitness groups who drank the low-flavanol cocoa experienced a decline in FMD in their arteries.

They also showed increases in diastolic blood pressure, reduced blood flow and shear rate, and lower oxygenation in their leg muscles.

In contrast, participants who consumed the high-flavanol cocoa maintained their FMD in both arm and leg arteries, showing no decline during the two-hour sitting session.

This is the first study to demonstrate that flavanols can prevent sitting-related vascular dysfunction in healthy young men.

Fitness level does not replace flavanols

The study found that higher fitness levels alone do not protect against temporary impairment of vascular function caused by prolonged sitting. However, consuming a high-flavanol drink preserved FMD in both fitter and less fit participants, indicating that flavanols can improve vascular health regardless of an individual’s fitness.

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How to include flavanols in your diet

Adding flavanol-rich foods to your daily diet is simple and convenient.

  • Cocoa products processed to preserve flavanol levels are widely available in supermarkets and health stores.
  • Fruits such as apples, plums, and berries, as well as nuts, black tea, and green tea, are also excellent sources of flavanols and can be easily incorporated into daily meals.

The researchers also highlighted that consuming flavanol-rich foods or drinks during periods of prolonged sitting can help reduce some of the harmful effects of inactivity on the vascular system.

Combining flavanol intake with short walks or standing breaks can further support long-term cardiovascular health, regardless of fitness level.

Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice or diagnosis. Always consult a qualified healthcare professional before making any significant changes to your diet or lifestyle.