A Current Biology meta-analysis found that the body compensates for nearly one-third of calories burned during exercise, helping explain why physical activity alone often produces less weight loss than expected.
By yourNEWS Media Newsroom
Exercise remains essential for health, but new research suggests the body may blunt its weight-loss effects by conserving energy elsewhere.
A meta-analysis published in Current Biology found that only about 72% of calories burned during exercise are reflected in total daily energy expenditure. The remaining 28% are offset as the body reduces energy spent on other functions, a process known as energy compensation.
The findings challenge the traditional view that exercise calories are simply added to a person’s daily calorie burn. Under that older model, a workout that burns 400 calories would raise total daily energy expenditure by the full 400 calories. The new analysis supports a constrained model, in which the body adjusts to higher activity levels by lowering energy use in other areas.
Those adjustments may include reductions in basal metabolic rate, sleeping metabolism and other cellular processes. Researchers said the body appears to defend an overall energy budget rather than allowing daily energy expenditure to rise in a fully linear way.
The findings help explain why people often lose less weight from exercise than calorie calculators predict.
Dr. Jason Fung, author of “The Obesity Code,” has described compensation as a major reason exercise alone often fails to produce expected fat loss. He wrote that “all this activity had no effect on obesity at all” and identified two key mechanisms: increased calorie intake after exercise and reduced resting energy expenditure.
Sandra Aamodt, author of “Why Diets Make Us Fat,” has written that the body’s energy-regulation system evolved in response to scarcity and works to defend a set weight range. When physical activity rises, the body may reduce energy allocated to processes it considers less essential.
The researchers said this does not mean exercise is ineffective. Instead, it means physical activity should not be viewed only as a calorie-burning tool.
The analysis suggests that exercise alone rarely produces dramatic fat loss because the body adapts. Dr. Joseph Mercola wrote on Mercola.com that “when it comes to losing weight and keeping it off, it’s crucial to understand that you cannot out-exercise your mouth.” A NaturalNews.com article similarly cited metabolic adaptation and increased appetite after workouts as reasons some people do not lose weight despite regular gym attendance.
The findings point to the importance of combining exercise with nutrition, sleep, stress management and resistance training. Diet remains a major factor in weight control, while movement supports broader health, metabolic function and body composition.
Resistance training may be especially important because of its effect on muscle. According to the “Textbook of Natural Medicine,” weight training may be more effective than aerobic exercise at maintaining or increasing lean body weight and metabolic rate during weight reduction.
Skeletal muscle plays a central role in blood sugar control. It helps remove glucose from the bloodstream, supports insulin sensitivity and contributes to resting metabolic rate. Building and preserving muscle may therefore improve long-term metabolic health, even when weight loss is modest.
Some research suggests resistance training may lead to less energy compensation than aerobic exercise alone, though more study is needed. A systematic review published in Sports Medicine found that physically active people tend to have more sensitive appetite control than inactive people, suggesting regular movement may improve the body’s regulation of energy intake.
The analysis also suggests that weight-loss efforts should focus less on maximizing calorie burn and more on improving physiology. Mark Sisson wrote in “The Keto Reset Diet” that increasing daily movement and avoiding prolonged stillness may be more important for health and weight control than relying on intense workouts alone.
The findings also move weight-loss discussions away from a simple effort-based explanation. If the scale does not change despite exercise, the reason may not be lack of discipline, but biological adaptation.
Researchers and nutrition experts cited in the report said a more effective approach includes strength training, supportive nutrition, adequate recovery, stress regulation and consistent movement. Rather than trying to force weight loss through calorie burn alone, the findings suggest working with the body’s adaptive systems may produce more sustainable results.
Exercise remains valuable for cardiovascular health, muscle strength, insulin sensitivity, mood and longevity. But the review indicates that its role in weight loss is more complex than the number of calories displayed on a treadmill or fitness tracker.
Source: Natural News
Original article
Comments