As many dieters are aware, dietary trends tend to wax and wane in popularity. For instance, the Sexy Pineapple diet introduced by a Danish psychologist in the 1970s never really caught on. Similarly, Kellogg’s has ceased promoting its Special K diet, which involved substituting two daily meals with a serving of the cereal. Current diet conversations have moved away from topics like eating for your blood type, avoiding acidic foods, or subsisting on potatoes.
However, intermittent fasting has maintained a strong following for over a decade and has seen a surge in popularity recently. A 2023 survey found that nearly one in eight U.S. adults had tried it.
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Mark Mattson, a neuroscientist at Johns Hopkins School of Medicine in Baltimore, Maryland, and author of the 2022 book “The Intermittent Fasting Revolution,” has researched fasting for three decades. He suggests that our hunter-gatherer ancestors often went without food for extended periods, which may have optimized our bodies to function well in a fasted state.
The Historical Context of Fasting
Fasting is an ancient practice, with roots stretching back to religious rituals and the fifth century BC when Hippocrates recommended it for various ailments.
Modern scientific interest in fasting was rejuvenated by research on calorie restriction starting in the 1930s, which showed lifespan extension in rodents on low-calorie diets. This effect was thought to be due to slowed growth, reduced fat intake, or decreased cellular damage from free radicals.
However, a 1990 observation by Ronald Hart at the US National Center for Toxicological Research suggested another angle: calorie-restricted rodents who ate all their food in a short time span might live longer due to extended fasting periods of around 20 hours.
Once humans use up glucose from food, typically about 12 hours after eating, the body starts burning fat for energy, producing ketone bodies. Intermittent fasting typically involves cycles of zero or very low-calorie intake long enough to produce these ketones. Popular methods include time-restricted eating (TRE), alternate-day fasting (ADF), and the 5:2 diet.
Some researchers believe that the metabolic switch from glucose to ketones activates beneficial stress responses, like enhanced DNA repair and cellular cleanup, offering more advantages than simply reducing calorie intake.
Accelerating Weight Loss
Diet studies are complex due to numerous variables such as individual behavior, genetics, and health conditions. Yet, evidence suggests intermittent fasting aids in weight loss. For example, in 2022, Courtney Peterson of the University of Alabama at Birmingham found that participants practicing TRE for six days a week over 14 weeks lost significantly more weight than those with a longer eating window. Peterson noted that TRE also reduces hunger, making it easier to eat less.
In the same year, Krista Varady of the University of Illinois, Chicago, reviewed 22 studies and found that ADF and the 5:2 diet could lead to a 4–8% weight reduction in individuals with obesity after 8–12 weeks, while TRE showed a 3–4% weight loss.
Despite the consensus on weight loss, researchers are divided on whether intermittent fasting offers additional benefits. A 2010 study by Michelle Harvie and Mark Mattson reported that women on a 5:2 diet saw greater reductions in insulin resistance than those on a calorie-restricted diet, though the difference was minimal.
Exploring Health Benefits Beyond Weight Loss
Early animal studies by Mattson’s team indicated that ADF could protect against neurodegenerative diseases and acute brain injuries. Other research by Satchin Panda at the Salk Institute showed that aligning mice feeding times with their natural nocturnal activity protected them against several metabolic diseases.
Recent human studies also suggest timing meals with circadian rhythms can improve metabolic health. Nonetheless, some researchers like Varady remain skeptical about benefits beyond those from reduced calorie intake.
Meanwhile, ongoing research continues to explore how fasting affects cellular functions differently from simple calorie restriction, potentially offering unique health benefits.
While the science evolves, the practical appeal of intermittent fasting lies in its simplicity—limiting eating to certain times may naturally lead to consuming fewer calories. This simplicity makes intermittent fasting an attractive option for those looking to manage their weight effectively.
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Cameron Aldridge combines a scientific mind with a knack for storytelling. Passionate about discoveries and breakthroughs, Cameron unravels complex scientific advancements in a way that’s both informative and entertaining.