Summary: Time-restricted eating alters gene expression across more than twenty-two regions of the brain and body in mice, revealing coordinated molecular changes that may underlie the wide-ranging health benefits linked to this dietary pattern.
Source: Salk Institute
Time-restricted eating and related practices such as intermittent fasting have been associated with multiple health benefits in animal and human studies, including improved metabolic health and increased lifespan in laboratory models.
Despite growing interest, the detailed molecular mechanisms and how changes in one organ influence others have remained unclear. Researchers at the Salk Institute have now mapped how limiting daily food intake to a defined window affects gene activity throughout the body and brain in mice, providing a multi-tissue view of the response to this nutritional intervention.
In the study, two groups of mice received the same high-calorie diet. One group ate freely around the clock, while the other was allowed to eat only during a nine-hour daily window. After seven weeks, researchers collected tissue samples from 22 organ groups and multiple brain regions at different times over a 24-hour cycle and analyzed changes in gene expression. Samples included the liver, stomach, lungs, heart, adrenal gland, hypothalamus, different portions of the kidney and intestine, and several brain areas.
The team found that a large fraction of the genome responds to time-restricted eating: approximately 70–80% of genes showed altered expression or rhythmic behavior in at least one tissue. These effects were not limited to metabolic organs such as the liver or gut; thousands of genes in the brain also changed in response to the feeding schedule.
“We found that there is a system-wide, molecular impact of time-restricted eating in mice,” says Professor Satchidananda Panda, senior author and holder of the Rita and Richard Atkinson Chair at Salk. “Our results open the door for looking more closely at how this nutritional intervention activates genes involved in specific diseases, such as cancer.”
Hormone-regulating organs showed particularly strong responses. Nearly 40% of genes in the adrenal gland, hypothalamus, and pancreas were affected by the feeding schedule; these organs play major roles in hormonal balance and coordination of physiological functions across tissues. Because hormonal dysregulation contributes to conditions from diabetes to stress-related disorders, the observed molecular shifts suggest pathways through which time-restricted eating may influence disease risk or progression.
The study also revealed regional differences along the digestive tract. Gene activity in the upper small intestine (the duodenum and jejunum) responded to time-restricted eating, while the ileum, the lower portion of the small intestine, showed much less change. This distinction points to specific sites where timing of intake interacts with nutrient processing and may guide future work on digestive diseases and cancers tied to circadian disruption, such as that experienced by shift workers.
Beyond tissue-specific changes, time-restricted eating synchronized circadian rhythms across multiple organs. According to Panda, “Circadian rhythms are everywhere in every cell. We found that time-restricted eating synchronized the circadian rhythms to have two major waves: one during fasting, and another just after eating. We suspect this allows the body to coordinate different processes.” This coordinated timing likely helps align metabolism, repair, and other cellular functions with periods of feeding and fasting.
Functional analysis of the affected genes indicated that time-restricted feeding reduced expression of genes linked to inflammatory signaling and glycerolipid metabolism, while increasing genes involved in RNA processing, protein folding, and autophagy. The intervention also rewired branched-chain amino acid (BCAA), glucose, and lipid metabolic pathways across tissues, suggesting broad metabolic adaptations to scheduled feeding.
These molecular insights have practical implications. They offer a clearer framework for how time-restricted eating might benefit conditions such as diabetes, heart disease, hypertension, chronic kidney disease, and certain cancers. By identifying the tissues and pathways most responsive to feeding schedules, the data provide targeted directions for further mechanistic research and for designing human interventions that combine dietary timing with or without pharmacological treatments.
Looking ahead, Panda’s team plans to examine specific disease models identified by their findings—such as atherosclerosis and chronic kidney disease—to determine whether and how time-restricted eating can modify disease trajectories through the molecular changes reported in this study.
About this diet and genetics research news
Author: Press Office
Source: Salk Institute
Contact: Press Office – Salk Institute
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Original Research: Open access. “Diurnal transcriptome landscape of a multi-tissue response to time-restricted feeding in mammals” by Shaunak Deota et al., Cell Metabolism.
Abstract
Diurnal transcriptome landscape of a multi-tissue response to time-restricted feeding in mammals
Highlights
- About 80% of genes show differential expression or altered rhythmicity under time-restricted feeding in at least one tissue
- Time-restricted feeding reduces expression of genes associated with inflammatory signaling and glycerolipid metabolism
- Time-restricted feeding increases genes linked to RNA processing, protein folding, and autophagy
- There is coordinated rewiring of branched-chain amino acid, glucose, and lipid metabolism across multiple tissues
Summary
Time-restricted feeding (TRF) is a behavioral nutrition intervention that alternates daily periods of feeding and fasting. TRF delivers benefits across multiple organ systems in animals and humans, yet the molecular basis for these effects has been incompletely defined. In this study, mice were fed either isocaloric ad libitum or a time-restricted schedule of a western-style diet. Researchers collected samples from 22 organs and brain regions every two hours over a 24-hour cycle and profiled gene expression changes.
The results show that TRF profoundly reshapes the diurnal transcriptome: nearly 80% of genes exhibit differential expression or rhythmic changes in at least one tissue. These tissue- and pathway-specific alterations reveal how timing of food intake can synchronize biological rhythms, shift metabolic programs, and modulate inflammatory and cellular repair pathways. The dataset and findings establish a foundation for follow-up mechanistic studies and offer guidance for designing human time-restricted eating interventions aimed at treating or preventing a range of diseases.