Intermittent fasting has gained attention as an approach to managing body weight, but its results may depend on more than meal timing alone.
Research from the University of Granada in Spain suggests that combining a structured eating schedule with supervised exercise can produce broader improvements than relying on either strategy independently.
<h3>Inside the 12-Week Clinical Trial</h3>
The research formed part of the TEMPUS project, led by scientists from the Joint University Institute for Sport and Health at the University of Granada, alongside collaborating biomedical research institutions. A total of 187 participants were randomly assigned to four groups.
The first received standard care, including guidance on Mediterranean-style eating and physical activity. The second followed an intermittent fasting schedule, while the third completed supervised exercise sessions. The final group combined fasting with structured physical training.
Participants assigned to fasting concentrated their daily meals within an eight-hour window. Those in the exercise groups completed supervised sessions combining resistance training and high-intensity aerobic activity. The intervention continued for 12 weeks, allowing researchers to compare how different strategies affected several aspects of metabolic and physical health.
<h3>Why Combining Meal Timing and Exercise Matters</h3>
Intermittent fasting changes when food is consumed rather than focusing exclusively on particular ingredients. Restricting eating to a defined period may help some individuals reduce their overall energy intake without following a complicated daily meal plan. Exercise contributes a different set of benefits. Resistance training challenges muscles and supports the preservation of lean tissue, while aerobic activity improves the body's ability to use oxygen during physical effort.
<h3>Weight and Body Composition Showed Different Results</h3>
One of the most notable findings concerned overall weight reduction. Participants following intermittent fasting, either independently or alongside supervised exercise, lost approximately 2.2 kilograms more on average than those receiving standard care. The combined approach also produced greater reductions in stored body tissue than standard care and exercise alone. This distinction matters because changes in body weight do not necessarily represent identical changes in body composition.
Weight measurements can reflect several components, including water, lean tissue, and stored energy. The exercise groups also demonstrated improvements in cardiorespiratory fitness.
<h3>Liver Health Did Not Improve Equally Across Groups</h3>
Despite the improvements in weight and body composition, the primary liver-related results were more complicated. Researchers used magnetic resonance imaging to measure changes in liver lipid accumulation. Levels declined across all four groups, but the differences between the interventions and standard care were not statistically significant.
Among participants who had hepatic steatosis at the beginning of the trial, approximately 30% of those following the combined fasting and exercise program no longer met the diagnostic criteria after 12 weeks. The corresponding proportion in the standard-care group was 6.5%. Although encouraging, this finding does not prove that the combined program is superior for every person with liver disease.
<h3>Expert Insight</h3>
Professor Jonatan R. Ruiz, Professor at the University of Granada, Spain, he said: “Intermittent fasting is effective for weight loss and improves cardiovascular health in people with obesity.”
The findings reinforce the value of considering several health indicators when evaluating weight-management strategies. Sustainable eating habits, regular physical activity, and continued support remain essential, while further research is needed to establish how long the benefits can be maintained.
