Water Fasting: Risks & Medical Advice
- University of Sydney researchers are cautioning individuals, particularly those with pre-existing heart or vascular issues, to seek medical advice before attempting weight loss through water-only fasting diets.
- While prolonged fasting for weight loss has gained popularity due to its rapid results, its long-term health implications remain unclear.
- The research involved 20 participants (11 women and nine men) who underwent a 10-day water-only fast, followed by a five-day refeeding period.
Water-only fasting can lead to rapid weight loss,but new research reveals significant risks,particularly for heart patients. News Directory 3 reports on a University of Sydney study that examined the health effects of prolonged water fasting, a practice often associated with the primary_keyword “weight loss,” though it may also exacerbate inflammation. The study involved 20 participants who fasted for ten days, experiencing side effects like headaches and low blood pressure, alongside a 7.7% body weight reduction. Crucially, researchers found that, rather than reducing inflammation, fasting actually increased pro-inflammatory proteins, posing heightened risks for those with existing secondary_keyword “heart conditions.” While some neuroprotective benefits were noted, the findings underscore the importance of medical oversight. Discover what’s next to know how to safely approach weight loss.
Water Fasting for Weight Loss: Proceed with Caution, Especially for Heart Patients
Updated June 05, 2025
University of Sydney researchers are cautioning individuals, particularly those with pre-existing heart or vascular issues, to seek medical advice before attempting weight loss through water-only fasting diets. This warning follows a study published in Molecular Metabolism examining the health impacts of prolonged fasting, defined as abstaining from calories and consuming only water for more than four consecutive days.
While prolonged fasting for weight loss has gained popularity due to its rapid results, its long-term health implications remain unclear. The study, conducted by an international team, investigated these potential effects.
The research involved 20 participants (11 women and nine men) who underwent a 10-day water-only fast, followed by a five-day refeeding period. Scientists monitored their health throughout the trial.
Participants experienced an average 7.7% reduction in body weight and a 6% decrease in waist circumference.Though, they also reported side effects such as headaches, insomnia, and low blood pressure.
Luigi Fontana, lead researcher and professor at the Charles Perkins center, noted the study’s unexpected findings regarding inflammation. Contrary to their initial hypothesis, researchers discovered that prolonged fasting increased pro-inflammatory proteins in the blood, potentially elevating health risks for individuals with existing heart and vascular conditions. This highlights the importance of understanding the risks of water fasting for weight loss.
Despite the risks of water fasting for weight loss, the study indicated a reduction in amyloid beta proteins, which are associated with alzheimer’s disease. This suggests a possible neuroprotective benefit,though further research is necessary to confirm any long-term effects on brain health.
“Our hypothesis was that prolonged water-fasting would reduce inflammation in the body. However,we found the opposite was true – that prolonged fasting put stress on the body and increased the number of pro-inflammatory proteins in the blood,potentially increasing the risk of health issues for people with existing heart and vascular conditions,” Fontana said.
What’s next
fontana advises individuals seeking effective weight management strategies to consult with their doctors, especially those with pre-existing health conditions, before attempting fasting diets. further research is needed to fully understand the long-term impact of these diets on the body.