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For the past decade, intermittent fasting has dominated diet trends. (ICYMI, intermittent fasting means not eating for a period of time, either daily or weekly.)
A preliminary study recently presented at the American Heart Association (AHA) Scientific Sessions on Epidemiology and Prevention, Lifestyle, and Cardiometabolism found that people who consumed all of their daily calories within an eight-hour period (a type of intermittent fasting) ) have a 91% higher risk of dying from cardiovascular disease.
“We were surprised to discover that people who followed an 8-hour time-restricted eating schedule were more likely to die from cardiovascular disease,” said study leader Dr. Victor Wenze Zhong in a press release. mentioned in. He said the diet is popular because of its short-term effects, such as weight loss, lower insulin levels and lower blood pressure, adding: “Our study clearly shows that… there is no link between eating less time and living longer.” It shows that.”
But don’t throw your fasting schedule out the window just yet, experts say.
“Unfortunately, this is the type of study that gives nutrition a questionable reputation,” says Dr. Dariush Mozaffarian, a cardiologist and director of the Food is Medicine Institute at Tufts University. “Currently, the evidence suggests that time-restricted eating, or intermittent fasting, is a reasonable approach for people if it works.”
Meet the experts: Dr. Dariush Mozaffarian is a cardiologist and director of the Food is Medicine Institute at Tufts University.Dr. Ernst von Schwarz, MD, Cardiologist, Author The secret of immortality.
Here’s everything we know about how intermittent fasting affects heart health.
What is intermittent fasting?
“Intermittent fasting is when you give yourself permission to eat only at specific times each day,” says Alyssa Ramsey, a New York-based dietitian and owner of Alyssa Ramsey Nutrition and Wellness. A registered dietitian once said: W.H..
Sonya Angelone, a San Francisco-based nutritionist and former chair of the AHA’s nutrition committee, said it’s common to fast for a period of time during the week. W.H.. However, he added that there is no “right” way to intermittent fasting. One common method of intermittent fasting is The 16:8 diet is an eating method in which you eat only 8 hours a day.
What was the learning test?
The new study followed more than 20,000 American adults, half of whom were men and half of whom were women. The average age of the group was 49 years.
The group completed two interviews about their mealtimes the previous day. The researchers then calculated participants’ average mealtimes, assuming a typical schedule for the rest of the study, and followed participants for an average of eight years.
No previous study had followed participants for more than a year, so this study aimed to examine the effects of intermittent fasting on long-term health. Researchers looked at the long-term health effects of a group that ate for no more than eight hours a day..
The results of the study, published on March 18, suggested that people who consumed all of their meals in less than eight hours a day had a 91% higher risk of dying from cardiovascular disease. Researchers say time-restricted eating did not reduce the overall risk of death from any cause.
This contradicts previous studies that followed participants over short periods of time and found that intermittent fasting led to improvements in things like lower insulin levels and lower blood pressure, both hallmarks of heart health.
2018 study published in cell metabolism Researchers showed that some patients experienced weight loss and significantly reduced blood pressure and insulin levels. According to the Mayo Clinic, high blood pressure increases the risk of heart failure, while high insulin levels can contribute to diabetes, obesity, and cardiovascular disease, according to the Cleveland Clinic.
“It is critical for patients, especially those with pre-existing heart disease or cancer, to be aware of the association between eight-hour mealtimes and increased risk of cardiovascular death,” Zhong said in a press release. Ta.
However, researchers did not find that intermittent fasting had such an effect. caused Cardiovascular death. “Although this study confirmed an association between an 8-hour eating window and cardiovascular death, this does not mean that time-restricted eating causes cardiovascular death,” Zhong said in the release. I added it inside.
What are the limitations of the study?
Cardiologists quickly discovered the study’s limitations. First, only abstracts were presented at the conference. Mozaffarian said this means the entire study has not yet been published or peer-reviewed.by email to W.H.Zhong said the study’s findings “are subject to change” before publication, as “reanalysis is common when addressing reviewer comments.”
In addition, he is a cardiologist and the secret of immortality, It pointed out. Because the data was self-reported rather than administered in a controlled environment, there are “questionable” reliability, Dr. von Schwartz said.
plus, Mozaffarian points out that the people in the study were not “consciously or intentionally” intermittent fasting. Instead, they simply reported when they ate the previous day. This means they are more likely to be missing meals for reasons other than health, he says. “It’s a mistake to call it intermittent fasting,” he says.
Finally, the findings do not discuss what Participants are eating. Dr. von Schwartz said that, along with the total amount of food you eat, it likely has a “bigger impact” on heart health than the timing of your meals. “Currently, there is no evidence that intermittent fasting has a negative impact on cardiovascular health,” he says.
Mozaffarian says it’s important for researchers to delve deeper into this topic in the hopes of one day providing more specific dietary guidelines.
“We have to shout from the rooftops for more science to understand what to eat, how to eat, and when to eat,” he says. “While we can confidently say what a healthy diet looks like, I don’t think we can confidently say whether when we eat makes a difference in our health.”
What does this mean for those practicing intermittent fasting?
For now, von Schwartz says people who are seeing short-term health benefits from intermittent fasting don’t need to make any lifestyle changes.
At this time, Mozaffarian points out that not enough research has been done to determine the long-term health benefits of intermittent fasting. However, he pointed to short-term studies (about a year or less) that have shown it to be effective for some individuals.
At this time, there is not enough research to know whether intermittent fasting affects women differently than men, Mozaffarian added.
“This is a summary that is not even a published paper, and the methodology does not address the questions asked,” he says. “Don’t let one study completely change established science and throw you off track from what you know and what you practice.”
Is intermittent fasting safe?
Yes, intermittent fasting is safe unless you have a “severe endocrine disorder” like uncontrolled diabetes, says Dr. von Schwartz.
Mozaffarian added that the most important thing is the meal itself, not the timing.
“It depends on what you eat,” he explains. “For some people, if intermittent fasting helps them avoid unhealthy foods and reset their metabolism and cravings, that’s great. As long as they focus on eating healthy foods. Others It might not work for some people.”
Intermittent fasting isn’t a hard yes or no for everyone, so you should always talk to your doctor or registered dietitian to find out if it’s right for you, he says. Masu.
“People have been practicing intermittent fasting for thousands of years for other reasons, including religious and spiritual reasons,” he says. “I think if you’re intentional and watch what you eat and do it right, it works for some people, but it doesn’t work for others. It actually adds some flexibility in how you try it. I think “Eat well and lose weight.” ”
Charlotte Walsh (she) is a deputy news editor at Women’s Health, covering the intersection of wellness and entertainment. Previously, he worked as a writer at The Messenger, E! News and Netflix. In her free time, she enjoys reality TV, tennis, and movies starring Nicole Kidman.
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