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- Restricting your diet to just eight hours a day may increase your risk of death from heart attack or stroke, according to a new study.
- Researchers report that people who follow this time-restricted eating plan also have a worse prognosis if they already have cardiovascular disease or cancer.
- The observational nature of this study makes it difficult to draw definitive conclusions, but research on the benefits and drawbacks of time-restricted eating continues to grow.
New research shows people who practice 16:8 intermittent fasting, one of the more popular time-restricted eating strategies, are more likely than non-fasters and those who adopt other fasting methods. They found that they may have a higher risk of cardiovascular disease and death than humans.
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Intermittent fasting (intentionally limiting the amount of time people burn calories each day) can help you lose weight, improve your cholesterol, boost your metabolism, and potentially reduce your risk of certain chronic diseases. It has become a useful and trendy method.
However, this new study raises some questions about the long-term health benefits of this dietary strategy.
Researchers surveyed a group of 20,000 adults who answered questions about their dietary patterns in the annual National Health and Nutrition Examination Survey from 2003 to 2018 (
Researchers said they found that participants who practiced 16:8 intermittent fasting were 91% more likely to die from cardiovascular disease than those who did not practice this type of fasting. .
They also reported that people with pre-existing cardiovascular disease who consumed all their calories between eight and 10 hours had a 66% higher risk of dying from heart disease or stroke.
In addition to the fact that researchers found that time-restricted eating was generally not beneficial for mortality risk, researchers found that among cancer patients who did not practice fasting, They also found that people who consumed more calories in a 16-hour window actually had an increased risk of death. They have a lower risk of dying from cancer than people who eat in a more restricted time frame.
“This study included a large sample and had a longitudinal design in which individuals were observed for an average of eight years. However, the dietary information collected was collected twice every 24 hours at enrollment. “Given that the study was recalled twice and dietary patterns can change over time, the results and accuracy of the study may be limited,” said Michelle Preventive Cardiologist, CDN. Ruthenstein said. said a nutritionist not involved in the study. Today’s medical news.
Additionally, observational studies by their nature cannot prove cause and effect.
These are not the only limitations, added Dr. Chen-Han Chen, an interventional cardiologist and medical director of the structural heart program at MemorialCare Saddleback Medical Center in California, who was not involved in the study.
“These findings run counter to many previous studies that have found that time-restricted eating is beneficial for cardiovascular and metabolic health,” he said. medical news articles. “Although the full study has not yet been published, there may be differences in the baseline characteristics of the time-restricted eating groups, which may account for these surprising findings. This result may be confounded by differences in baseline demographics and characteristics between the TR groups (particularly between the <8 hours group and other groups), as well as biases in participants' recall of dietary patterns.”
Experts say that despite the limitations, the study’s findings leave room for further investigation.
They said there are few long-term human studies on intermittent fasting, so studies like this are critical to increasing our understanding of intermittent fasting practices.
“This study is a great example of how short-term results don’t necessarily predict long-term effects,” said Chief Medical Officer of cardiometabolic care telemedicine company 9amHealth, who was not involved in the study. said Dr. Avantika Waring.
“Intermittent fasting may help you lose weight and improve some metabolic markers in the short term, but it does not provide any lasting cardiovascular benefits,” Waring said. Ta. Today’s medical news.
Ultimately, whether you want to try some form of intermittent fasting is up to you, your doctor’s advice, and your short- and long-term goals.
“I still recommend intermittent fasting to my patients as a way to lose weight, improve blood sugar control, improve cholesterol, and maintain overall cardiovascular health,” Chen said.
“For people looking to improve their health, the most recommended diets are those that can be followed consistently,” said Maggie Evans, RDN, nutrition program manager at 9amHealth. Today’s medical news. “The optimal eating pattern will depend on your personal medical history, health goals, and factors that influence your ability to succeed, such as your socio-economic status, budget, and lifestyle.”
Waring agreed.
“This study is very interesting overall, and I know that many of my patients are successful in losing weight by restricting the range of food they eat, but it’s important to note that the types of foods they eat , which means it’s unprocessed and nutritious,” she said. . “And until we have more details about this study, and ideally until a randomized controlled trial is done to go beyond the association and study the actual effects of intermittent fasting, I’m going to leave this to others. dietary pattern.”
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