FILE – A dish with roast turkey breast is photographed in Concord, N.H., on Sept. 28, 2015. (AP Photo/Matthew Mead, File)
Intermittent Fasting: Does Time-Restricted Eating Really Work for Weight Loss?
As weight-loss plans go, it’s easy to see the allure of intermittent fasting: Eat what you want, but only during certain windows of time — often just eight hours a day.
Instead of counting calories or measuring portions, dieters just have to pay attention to the clock, said Courtney Peterson, a nutrition researcher at the University of Alabama at Birmingham.
“You have this really simple rule: Eat or don’t eat,” Peterson said.
The technique has skyrocketed in popularity in recent years, becoming a leading trending topic on social media.
Intermittent Fasting Explained
Intermittent fasting is a meal strategy where people switch between fasting and eating on a regular schedule, defined as at least 14 hours with no food, Peterson said. That can mean variations such as eating every other day, eating five days a week and then fasting for two days, or limiting daily eating to certain hours.
Time-restricted eating, where people condense all of their eating into a daily window of 10 hours or less, is the most popular form of intermittent fasting. Diners will delay breakfast until 10 a.m. or noon and then eat dinner by 6 p.m. or 8 p.m., forgoing food the rest of the time.
How Time-Restricted Eating is Supposed to Help
The theory behind time-restricted eating is that it supports the circadian rhythm, or the body’s internal clock. Spending more time in a fasting state may boost the body’s processes that govern blood sugar and fat metabolism, for instance, scientists say.
Early studies in mice starting in 2012 seemed to show health benefits from time-restricted eating. Small studies in people with obesity suggested that the practice might help them lose weight and improve other health markers.
Effectiveness for Weight Loss
Research has shown that people on time-restricted eating plans tend to eat fewer calories, which could explain weight loss.
Results from combined studies suggested that adults with obesity who limited their eating hours without focusing on calories naturally reduced their energy intake by 200 to 550 calories a day, losing 3% to 5% of their baseline body weight.
But a larger study of people observed over a longer period of time showed that the time restrictions alone might not matter.
A 2022 study published in the New England Journal of Medicine tracked 139 people with obesity for a year. Participants either followed a calorie-restricted diet during a certain time window or ate the same number of calories throughout the day. Both groups lost weight — 14 to 18 pounds on average — but there was no significant difference between the strategies.
Peterson’s Insights
“Our data right now suggests that time-restricted eating isn’t any better or worse than cutting calories,” Peterson said. Nor does the technique help burn more calories, she added.
Still, Peterson said, the simplicity of time restriction might be easier to maintain than a typical diet.
“Almost no one likes calorie counting,” she said.
While intermittent fasting, particularly time-restricted eating, offers an appealingly straightforward approach, its effectiveness in comparison to traditional calorie counting remains a topic of ongoing research. For those struggling with the rigors of calorie restriction, the ease of time-restricted eating could still present a viable alternative, even if it doesn’t offer superior results.
#IntermittentFasting #WeightLoss #HealthyEating #Nutrition #FastingBenefits