A groundbreaking study presented by the American Heart Association has challenged the widespread belief that 168 intermittent fasting is a safe weight-loss strategy. The research, which tracked dietary patterns and mortality data of over 20,000 U.S. adults, discovered that individuals who confined their eating to an eight-hour window daily experienced a 91% increase in the risk of cardiovascular death. This finding has sent ripples through the health and wellness community, prompting experts to re-evaluate the long-term effects of this popular diet.
What Is 168 Intermittent Fasting?
Also known as time-restricted eating, the 168 method involves a 16-hour fasting period followed by an 8-hour eating window. During the fasting phase, only calorie-free beverages like water, black coffee, or tea are allowed. The goal is to deplete glycogen stores and shift the body into fat-burning ketosis. While many use it for weight loss and metabolic health, the latest evidence suggests potential dangers.
The Study and Its Shocking Findings
The research, published in the American Heart Association’s journal, analyzed data from the National Health and Nutrition Examination Survey (NHANES) from 2003 to 2018, linked to mortality records through 2019. Led by Dr. Wen Ze from Shanghai Jiao Tong University, the team identified five critical results:
- Eating within a daily window of less than eight hours was linked to a 91% higher risk of death from cardiovascular disease.
- This risk was elevated even among individuals with pre-existing heart conditions or cancer.
- Those with heart disease who ate within 8 to 10 hours saw a 66% increased risk of death from heart disease or stroke.
- Unlike previously thought, time-restricted eating did not reduce overall mortality risk.
- Interestingly, cancer patients who ate for more than 16 hours daily had a lower risk of cancer-related death.
Dr. Wen Ze warned that while 168 fasting may offer short-term benefits, its long-term outcomes could be detrimental, particularly for cardiovascular health.
Who Should Avoid 168 Fasting?
Following reports of adverse effects—including a confirmed case of gastric ulcers after three months on the diet—medical professionals have identified three groups that should steer clear:
- Individuals with high energy demands, such as athletes, for whom fasting might cause hypoglycemia and fainting.
- Those with poorly controlled diabetes, as fluctuations in blood sugar can worsen with prolonged fasting.
- People prone to binge eating, as restricting eating times may lead to overconsumption of unhealthy foods during the eating window.
These recommendations come from healthcare experts concerned about the safety of this diet for vulnerable populations.
Broader Implications and Next Steps
The findings from the American Heart Association underscore the need for caution, especially for those with existing health conditions. While 168 intermittent fasting remains popular for its simplicity and potential metabolic benefits, this research suggests that it may not be a one-size-fits-all solution. Individuals considering or currently practicing this diet should consult with a healthcare provider, particularly if they have risk factors for heart disease. Further studies are needed to understand the mechanisms behind these risks and to identify safer approaches to weight management.
For those interested in learning more, explore the full study on the American Heart Association’s website or speak to a dietitian about personalized eating plans that balance health goals with safety.