The Impact of Daily Habits on Animal Lifespan

Research on Behavior and Aging

A recent study supported by the Knight Initiative for Brain Resilience at the Wu Tsai Neurosciences Institute, Stanford University, has revealed a link between the everyday habits of animals and their expected lifespan. During the research, scientists continuously observed dozens of short-lived fish throughout their entire lives to understand how behavioral traits are connected to the aging process.

Despite similar genetics and identical living conditions, the fish displayed different rates of aging. Even in the early stages of adulthood, differences became apparent in their swimming patterns and rest habits. These behavioral patterns allowed researchers to predict whether a fish would live longer or shorter than average.

Observation Methodology

The African turquoise killifish—a species with a life cycle of four to eight months—was chosen as the research subject. This species has a complex brain and other biological features similar to those of humans, making it valuable for aging studies.

Each fish was kept in a separate aquarium under constant video surveillance. In total, 81 individuals were tracked, and the collected data included billions of video frames. Researchers analyzed parameters such as posture, movement speed, periods of rest, and activity. Around 100 different behavioral elements were identified, forming the basis of the fish's motor and resting activities.

Key Findings

The study showed that behavioral differences, especially in sleep patterns and activity levels, emerge as early as middle age (70–100 days). Fish with shorter lifespans slept not only at night but increasingly during the day, while longer-lived individuals mostly rested at night and were more active during the day. Higher daytime activity and energetic swimming also correlated with greater longevity.

Using machine learning models, researchers found that just a few days of observing the behavior of middle-aged fish was enough to estimate their expected lifespan. Early-life behavioral changes can serve as indicators of future health and longevity.

The Nature of Aging

Aging in fish did not occur smoothly or gradually. Most individuals went through two to six rapid phases of behavioral change, each lasting several days, followed by longer periods of stability. Typically, these stages followed one another in sequence.

Gene activity analysis in different organs showed that the most noticeable differences were found in the liver. Fish with shorter lifespans had more active genes related to protein production and cellular maintenance, indicating parallel internal biological changes.

Perspectives and Future Research

The results suggest that behavior is a sensitive indicator of aging. In humans, sleep quality and sleep-wake cycles also deteriorate with age, which is linked to cognitive decline and neurodegenerative diseases.

Future research aims to determine whether improving sleep and targeted interventions—such as dietary changes or genetic methods—can influence the trajectory of aging. There are also plans to transition to more natural living conditions for animals to obtain more realistic data.

The study seeks to explain the causes of individual differences in aging and to discover new ways to support health and extend lifespan.