Time-Restricted Eating Affects Gene Expression in Multiple Organs

Scientists at the Salk Institute in La Jolla have made a groundbreaking discovery, revealing the molecular effects of time-restricted eating on the body. While previous studies have shown the health benefits of time-restricted eating, including increased lifespan in laboratory studies, the precise molecular mechanisms behind how it affects the body, as well as how these changes interact across multiple organ systems, have not been well understood.

The study, published in Cell Metabolism, found that 70% of mouse genes respond to time-restricted eating, with nearly 40% of genes in the adrenal gland, hypothalamus, and pancreas being affected. These findings have implications for a wide range of health conditions where time-restricted eating has shown potential benefits, including diabetes, heart disease, hypertension, and cancer.

To conduct the study, two groups of mice were fed the same high-calorie diet. One group was given free access to food, while the other group was restricted to eating within a nine-hour window each day. After seven weeks, tissue samples were collected from 22 organ groups and the brain at different times of the day or night and analyzed for genetic changes. Samples included tissues from the liver, stomach, lungs, heart, adrenal gland, hypothalamus, different parts of the kidney and intestine, and different areas of the brain.

The study found that time-restricted eating synchronized the circadian rhythms of multiple organs in the body, allowing the body to coordinate different processes. The researchers also discovered that not all sections of the digestive tract were affected equally by time-restricted eating, with the ileum at the lower end of the small intestine not being affected. This finding could lead to further research on how shift work, which disrupts the body’s 24-hour biological clock, impacts digestive diseases and cancers. Previous research by the Salk team showed that time-restricted eating improved the health of firefighters, who typically work shifts.

The scientists will now take a closer look at the effects of time-restricted eating on specific conditions or systems implicated in the study, such as atherosclerosis, which is a hardening of the arteries that can lead to heart disease and stroke, as well as chronic kidney disease.