Circadian Reprogramming by Combined Time-Restricted Feeding and Exercise Improves Metabolic Homeostasis in Diabetes.

Area of Science:

• Metabolic Health
• Circadian Biology
• Diabetes Research

Background:

• Circadian disruption is a known factor exacerbating type 2 diabetes mellitus (T2DM).
• Time-restricted feeding (TRF) and exercise (EX) individually improve metabolic health.
• The combined effects of TRF and EX on metabolic regulation, particularly via circadian pathways, remain largely unelucidated.

Purpose of the Study:

• To investigate the additive effects of combined TRF and EX on metabolic parameters in a mouse model of T2DM.
• To determine if combined TRF and EX can reprogram circadian energy metabolism.
• To explore the underlying molecular mechanisms, including mitochondrial function and thermogenesis.

Main Methods:

• Male db/db mice were divided into control, diabetic model (DM), TRF, EX, and TRF + EX groups for 8 weeks.
• Evaluated body weight, glucose/insulin tolerance, and 24-hour energy expenditure.
• Assessed mitochondrial function, oxidative stress, inflammation, and gene expression related to mitophagy and thermogenesis.

Main Results:

• Combined TRF + EX significantly reduced body weight, fasting blood glucose, and improved glucose/insulin tolerance compared to DM and individual interventions.
• The combination therapy enhanced diurnal metabolic rhythm amplitude and phase.
• TRF + EX led to the highest expression of thermogenic genes and restored skeletal muscle antioxidant capacity while reducing inflammation markers.

Conclusions:

• Combined TRF and EX additively restore metabolic homeostasis in T2DM by re-entraining circadian energy rhythms.
• The intervention improves mitochondrial quality and activates adipose thermogenesis.
• Integrated lifestyle timing strategies warrant further investigation as a therapeutic approach for diabetes.