Intermittent Fasting Keeps Weight Off for a Year, Study Finds
A new study published in July 2026 found that people who followed a 12-week intermittent fasting program kept more weight off one year later than those who followed a standard eating schedule. Participants ate within an eight-hour window each day.
A 12-week intermittent fasting program produced weight-loss results that held up a year later, according to research published in July 2026. Participants who ate within an eight-hour window each day maintained more weight loss than those who followed their usual longer eating schedule.
The study tracked participants for 12 months after the initial program ended. Those in the time-restricted eating group kept off more weight than the control group, suggesting the approach can produce lasting changes in eating habits and metabolism.
Researchers noted that the eight-hour eating window, typically from noon to 8 p.m., was manageable for most participants. Dropout rates were lower than in studies using more restrictive fasting protocols.
The findings add to a growing body of research on time-restricted eating. Earlier studies showed short-term benefits for weight loss and metabolic health, but long-term data had been limited.
Science Daily reported the results on July 18, 2026, noting that the study was among the first to track outcomes for a full year after a structured intermittent fasting program.
Researchers cautioned that intermittent fasting is not suitable for everyone. People with diabetes, eating disorders, or certain medical conditions should consult a doctor before starting any fasting regimen.
A separate Cochrane review published in February 2026 found that intermittent fasting produced little difference in weight loss compared to standard dietary advice when measured across multiple studies. Researchers said the conflicting results reflect differences in study design, duration, and participant populations.
Dietitians say the best eating plan is one a person can stick to long-term. For some people, a defined eating window provides structure that makes it easier to reduce overall calorie intake without counting calories.
