Time-Restricted Feeding Attenuates Salt-Sensitive Hypertension and Renal Damage

Area of Science:

• Cardiovascular Physiology
• Renal Physiology
• Metabolic Research

Background:

• Salt-sensitive (SS) hypertension is a significant health concern.
• Limited data exists on the efficacy of time-restricted feeding (TRF) in managing SS hypertension.
• TRF, a form of intermittent fasting, has shown potential in improving blood pressure regulation.

Purpose of the Study:

• To investigate the effects of TRF on hypertension progression in Dahl SS rats fed a high-salt diet.
• To evaluate the impact of TRF on renal damage in the context of high-salt intake.
• To determine if TRF can attenuate the development of salt-sensitive hypertension.

Main Methods:

• Chronic measurement of mean arterial pressure (MAP) in Dahl SS rats.
• Implementation of TRF (16-hour fasting, 8-hour feeding) or ad libitum feeding.
• Metabolic phenotyping, including respiratory exchange ratio and sodium excretion analysis.
• Assessment of creatinine clearance to evaluate renal function.

Main Results:

• Rats on a high-salt diet exhibited increased blood pressure.
• TRF significantly blunted further increases in MAP during the intervention period.
• Reduced MAP during the active feeding phase contributed to lower 24-hour MAP in TRF rats.
• TRF did not alter daily sodium intake or body weight but affected metabolic parameters like respiratory exchange ratio.

Conclusions:

• TRF effectively attenuated salt-sensitive hypertension and renal damage in male SS rats on a high-salt diet.
• The benefits of TRF were observed without changes in sodium intake or body weight.
• TRF presents a potential dietary strategy for managing SS hypertension, possibly as an alternative to salt restriction.