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A large study found that intermittent fasting (a dieting strategy that limits the amount of time you can eat each day) is associated with a 91% higher risk of heart-related death. This risk was associated with eating within an 8-hour window or less in a 24-hour day, compared to the more common 12-16 hour window.
of new preliminary investigation This paper was presented at the American Heart Association (AHA) EPI Lifestyle Science Session 2024 on March 18. The paper looked at deaths from cardiovascular disease in more than 20,000 U.S. adults, followed for an average of eight years.
Experts told Live Science that this study highlights the need to be cautious about the use of intermittent fasting. However, one researcher noted that until all the data from the study is published, it is difficult to say whether the time of day or the type of food consumed is more associated with a person’s risk of death.
“It’s entirely possible to eat really poor quality food while being restricted in your eating hours.” christopher gardnerStanford University School of Medicine professor told Live Science. She added that some participants with restricted eating windows may also be facing food insecurity and not getting enough to eat. Regarding the new research, he said, “We don’t know everything yet. I’d like to wait for more information.”
Related: 9 heart disease risk factors, according to experts
“There are too many unknowns.”
intermittent fasting You should only eat at certain times each day (often 4 to 12 hours out of a 24-hour period). Previous research Intermittent fasting has been shown to improve indicators related to cardiovascular health in the short term over several months. insulin resistance.
Of the 20,000 people included in the new study, 414 reported eating within an eight-hour window or less each day. Participants were not assigned a diet to follow, but through his two studies in which participants recalled everything they ate in two 24-hour windows, their typical eating habits were determined. It was evaluated.
This study found an association between 8-hour meal times and cardiovascular death, but by its design it cannot say whether this eating schedule is correct. caused The number of deaths only shows a correlation.
“We were surprised to find that compared to people who eat for 12 to 16 hours a day, people who limit their meal time to less than eight hours a day have a higher risk of cardiovascular death and are less likely to live longer,” said the principal investigator. the author stated. Victor Wenze ChongProfessor of Epidemiology and Biostatistics at Shanghai Jiao Tong University School of Medicine told Live Science via email.
Restricting food intake during this short window was associated with an increased risk of cardiovascular death for the group overall and for people with either cancer or heart disease identified in a separate analysis. Additionally, participants with pre-existing cardiovascular disease who ate during an 8-10 hour eating window had a 66% higher risk of death from heart disease or stroke compared to participants with a longer eating window. .
Dr. Wendy BennettThe study suggests a need to scrutinize “the fad diet push that we should limit our eating time,” said Johns Hopkins University School of Medicine, an associate professor at the Johns Hopkins University School of Medicine. he pointed out.Bennett et al. published research The January 2023 paper also raises questions about the purported benefits of intermittent fasting, suggesting it is not a successful weight loss strategy over a six-year time frame.
Zhong agreed that the new research calls for more caution about intermittent fasting, especially for people with heart disease or cancer. But overall, “it’s too early to make specific recommendations.” [time-restricted eating] “Based solely on our study,” he said, there is a need to investigate exactly how 8-hour intermittent fasting affects heart health and evaluate additional populations around the world. I emphasized.
This study has some limitations. For example, although participants provided dietary data through self-report, some may have incorrectly remembered what they ate. Since her only two dietary surveys were used, it is unclear whether these accurately represent people’s long-term dietary habits. The study also did not take into account the nutritional value of participants’ diets or their reasons for practicing intermittent fasting.
“It looks fascinating, but there’s a lot we don’t know,” Gardner said, adding that there is a lot of interest in the full results of the study.
New research aside, intermittent fasting may have other negative effects. Aunt CynthiaA professor of psychiatry who studies eating disorders at the University of North Carolina School of Medicine told LiveScience in an email. For example, even though intermittent fasting is being “hailed as the next great strategy for weight management,” intermittent fasting can be difficult for family and social relationships if your eating schedule doesn’t match that of your loved ones. She noted that this could have an impact.
“Furthermore, for some people who are genetically predisposed to eating disorders, long-term fasting could theoretically lead to a negative energy balance (expending more energy than they consume), leading to eating disorders. “It can cause the onset of the disease,” she said. ”
This article is for informational purposes only and does not provide medical advice.
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