Intermittent fasting has attracted enormous attention as a weight-loss strategy. Millions of people around the world now use some form of fasting to manage their weight, improve blood sugar control, and support overall health.
Social media, health websites, and fitness experts often describe fasting as a simple way to lose weight without constantly worrying about calories.
The basic idea behind intermittent fasting is straightforward. Instead of focusing mainly on what people eat, fasting focuses on when they eat. Some people limit their meals to a specific daily time window, while others drastically reduce calories on selected days each week.
Although intermittent fasting has become extremely popular, scientists are still learning how it affects the body. One important question is whether younger and older adults experience the same benefits and risks.
To answer this question, researchers conducted a large review of 28 clinical studies involving more than 1,800 participants. Their findings were published in the journal Nutrients and revealed that age may play a much bigger role than previously thought.
The analysis confirmed that intermittent fasting generally leads to weight loss. Participants across different age groups experienced reductions in body weight and body mass index. This finding supports earlier research showing that fasting can be an effective method for reducing excess weight.
However, losing weight is only part of the story. The researchers discovered that the composition of the weight loss matters greatly. Ideally, people want to lose excess body fat while keeping as much muscle as possible. Muscle is essential for maintaining strength, supporting metabolism, and helping people stay active throughout life.
The review found evidence that a considerable amount of weight lost during fasting may come from lean body mass, which includes muscle. In some studies, muscle loss represented a surprisingly large share of total weight loss.
This finding becomes increasingly important with age. Older adults naturally lose muscle mass as part of the aging process. If fasting accelerates that loss, it could potentially increase frailty and reduce physical function over time.
Fortunately, the researchers identified practical strategies that appear to protect muscle. Studies showed that participants who exercised regularly while fasting often maintained their muscle mass much better than those who did not exercise. Resistance training was particularly effective.
Protein intake was another key factor. People who consumed sufficient protein were more likely to preserve muscle during weight loss. Experts increasingly recommend that individuals using intermittent fasting prioritize high-quality protein sources and engage in regular strength-building activities.
Another finding surprised the researchers. While intermittent fasting improved several health measures, LDL cholesterol increased on average in many age groups. LDL cholesterol is often referred to as bad cholesterol because elevated levels are associated with a higher risk of heart disease.
This result differs from several earlier studies that reported reductions in LDL cholesterol during fasting programs. The reason for the discrepancy is not yet clear. Differences in diet quality, fasting schedules, participant characteristics, and study design may all contribute.
The finding does not mean people should avoid intermittent fasting. Instead, it highlights the importance of regular health checks. Individuals following long-term fasting programs may benefit from monitoring their cholesterol levels to ensure they are not developing unexpected risk factors.
The review also suggests that age influences how the body responds to fasting. Younger adults and older adults may lose similar amounts of weight, but the underlying metabolic changes can differ significantly. This means that a fasting strategy that works well for one person may not be ideal for another.
Researchers believe future health recommendations will likely become more personalized. Rather than giving everyone identical advice, doctors may eventually tailor fasting plans according to age, muscle mass, health status, and cardiovascular risk.
For now, intermittent fasting remains a promising option for weight management. However, experts caution against viewing it as a miracle solution. Successful long-term health depends on many factors, including balanced nutrition, regular physical activity, adequate sleep, stress management, and routine medical care.
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Source: University of Córdoba.
