Study Links Later Breakfasts to Slightly Higher Mortality in Older Adults
Decades-long analysis finds meal timing — particularly breakfast — may signal overall health and modestly affect 10-year survival, though researchers say the study cannot prove cause and effect.
Eating breakfast later in the day was associated with a small but statistically significant increase in mortality among older adults in a decades-long observational study, researchers reported.
Investigators led by Dr. Hassan Dashti of Massachusetts General Hospital and Harvard Medical School analyzed meal timing, health conditions, genetics and death records for nearly 3,000 adults aged 42 to 94 using data from the University of Manchester. The results, published this month in the journal Communications Medicine, found that each additional hour of delay in breakfast time was tied to a higher risk of death, and that older adults who maintained earlier meal schedules had better 10-year survival estimates.
Over roughly three decades of observation, with 22 years of follow-up cited in the report, researchers recorded 2,361 deaths among study participants. The analysis showed a 10-year survival rate of 89.5% for people who ate earlier in the day compared with 86.7% for those who ate later. The authors described the difference as modest but statistically significant.
The study also documented how eating patterns shift with age. On average, every decade of aging was linked to an eight-minute delay in breakfast and a four-minute delay in dinner. Participants tended to shorten their overall eating window and shift the midpoint between first and last meal later in the day. The researchers noted that factors such as poor sleep, depression, dental or chewing problems, fatigue, retirement, living alone or moving into assisted living could contribute to delayed meals.
Because the research was observational, the authors cautioned that the associations do not prove that later breakfasts cause higher mortality. "The study cannot say for sure that these health issues cause later breakfasts, only that they often occur together," Dashti said in an interview cited by the team.
Physical and psychological conditions, including depression, anxiety, fatigue and oral health problems, were tied to later meal timing, suggesting that when seniors eat could act as a simple marker of underlying health. The investigators recommended that clinicians and caregivers consider meal timing as one possible signal of physical or cognitive decline that may merit further assessment.
The findings contribute to a growing body of research in chrononutrition, a field that examines how meal timing and circadian rhythms affect metabolic health and aging. The authors noted that trends such as intermittent fasting and time-restricted eating, popular among younger adults, may have different implications for older populations and should be studied with attention to age-related changes in appetite, sleep and social circumstances.
Dashti and colleagues suggested that maintaining consistent eating patterns might help preserve healthy body rhythms that support aging, and they urged additional research to determine whether adjusting meal timing can directly influence long-term health outcomes. Future studies will need to explore mechanisms and test whether interventions that shift meal times can improve markers of health and longevity in older adults.
The study adds nuance to longstanding dietary advice by highlighting the potential importance of when people eat, not just what they eat, for aging populations. Researchers emphasized the need for caution in interpreting the results and called for clinical trials to establish whether modifying meal timing could become a practical component of strategies to promote healthy aging.
