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Obesity is a complex condition influenced by a combination of genetic, behavioral, and environmental factors, and dietary modification remains a essential of its management. Among the various approaches to caloric restriction, Intermittent Fasting (IF) has gained significant attention as a potential alternative to traditional Continuous Caloric Restriction (CCR). Intermittent fasting involves alternating periods of eating and fasting, with popular regimens including the 16:8 method, alternate-day fasting, and the 5:2 approach. Continuous caloric restriction, in contrast, emphasizes a consistent daily reduction in energy intake, typically ranging from 20% to 40% below estimated requirements. Both strategies aim to create a negative energy balance, but emerging research suggests that differences in physiological, behavioral, and metabolic responses may influence adherence, weight-loss outcomes, and cardiometabolic health.

Weight and body composition were measured at baseline, six weeks, and 12 weeks using Dual-Energy X-ray Absorptiometry (DEXA), while fasting glucose, insulin, lipid profiles, and blood pressure were assessed to evaluate cardiometabolic changes. Participants also completed weekly self-reported adherence logs, appetite questionnaires, and ratings of hunger, energy, and satiety. These measures were used to assess not only physiological outcomes but also behavioral and psychological responses to the different dietary strategies.

By the end of the 12-week period, both groups achieved significant weight loss relative to baseline. The IF group lost an average of 6.8 kilograms, while the CCR group lost an average of 6.2 kilograms. While the difference between groups was modest and not statistically significant, secondary outcomes revealed nuanced differences. The IF group experienced slightly greater reductions in fat mass, particularly in visceral adipose tissue, as measured by DEXA scans. Lean mass was largely preserved in both groups, although the IF group exhibited marginally higher lean-mass retention, which may reflect metabolic adaptations associated with fasting periods.

Adherence patterns differed notably between the two strategies. Participants in the IF group reported higher overall satisfaction and less perceived deprivation, particularly after the initial two-week adaptation period. Hunger ratings during fasting periods decreased progressively, likely reflecting metabolic adaptations and increased reliance on fat stores for energy. In contrast, the CCR group reported more consistent feelings of hunger throughout the day, which some participants found challenging to manage. Despite these differences, attrition rates were similar between groups, with only two participants in each group discontinuing the study due to scheduling conflicts or personal reasons unrelated to the diet protocol.

Physiologically, intermittent fasting may trigger adaptations that favor fat oxidation and metabolic flexibility. During fasting periods, glycogen stores are depleted, prompting the body to utilize fat as a primary energy source. This metabolic shift can contribute to reductions in visceral fat, improvements in insulin sensitivity, and preservation of lean mass. Intermittent fasting has also been associated with upregulation of autophagy and other cellular repair mechanisms, which may offer additional health benefits beyond weight loss, although these effects require longer-term studies for confirmation.

The study’s findings support the notion that both intermittent fasting and continuous caloric restriction are effective strategies for weight loss and cardiometabolic improvement. The modest differences observed suggest that IF may offer slight advantages in visceral fat reduction, insulin sensitivity, and user satisfaction, particularly for individuals seeking flexibility in meal timing. These findings align with previous research demonstrating that intermittent fasting is at least as effective as continuous restriction and may improve adherence in select populations.

Several limitations should be acknowledged. The study duration of 12 weeks, while sufficient to observe short-term effects, does not capture long-term weight-maintenance outcomes or the sustainability of either dietary strategy. Self-reported adherence and appetite ratings may be subject to reporting bias, and daily energy intake outside the study-provided meal plans was not fully monitored. The sample was limited to generally healthy overweight adults, which may reduce generalizability to populations with obesity-related comorbidities, older adults, or adolescents. Finally, the study did not examine psychological or behavioral outcomes in depth, such as changes in mood, eating behavior patterns, or cognitive effects of fasting.

Overall, this study demonstrates that both intermittent fasting and continuous caloric restriction effectively produce weight loss, improve metabolic markers, and reduce cardiovascular risk factors in overweight adults. Intermittent fasting offers comparable, and in some parameters slightly superior, outcomes with the added benefit of higher user satisfaction and potentially greater visceral fat reduction. These findings suggest that intermittent fasting is a viable and flexible alternative to continuous caloric restriction, allowing individuals to select a dietary strategy that best aligns with personal preferences, lifestyle, and health goals.