# Daytime-restricted feeding induces lean MAFLD in high-fat diet-fed mice by upregulating CD36-mediated lipid accumulation

## TL;DR

Daytime-restricted feeding in mice on a high-fat diet leads to lean fatty liver disease by increasing lipid accumulation through CD36.

## Contribution

Identifies CD36 as a key mediator in lean MAFLD development under daytime-restricted feeding.

## Key findings

- High-fat daytime-restricted feeding induces lean MAFLD with dyslipidemia and hepatic lipid accumulation.
- CD36 upregulation disrupts AMPK signaling, promoting lipid accumulation in the liver.
- CD36 is a potential therapeutic target for lean MAFLD caused by high-fat diets.

## Abstract

Time-restricted feeding (TRF) may aid in weight loss and improve metabolic health; however, its long-term effects and applicability to all individuals remain unclear. This study investigated the impact of different dietary patterns on hepatic metabolism by subjecting mice to either a normal chow diet or a high-fat diet, allowing for ad libitum feeding, daytime restrictive feeding (DRF), or nighttime restrictive feeding (NRF). Using metabolic cages to assess energy intake, we found that the fuel utilization rhythms of DRF mice were disrupted compared to ad libitum-fed mice. Mice on normal chow DRF exhibited only dyslipidemia, while those on high-fat DRF developed lean metabolic dysfunction-associated fatty liver disease (MAFLD), characterized by more pronounced dyslipidemia, weight loss, and hepatic lipid accumulation. RNA seq revealed that CD36 plays a crucial role in the development of lean MAFLD induced by high-fat DRF by inhibiting AMPK phosphorylation, disrupting the balance between lipogenesis and oxidation. Mechanistic validation was performed in CD36 liver-specific knockout mice and Liposomal nanoparticle injection models. These findings provide new insights into the potential mechanisms linking feeding patterns to lean MAFLD. Additionally, CD36 emerges as a potential therapeutic target for high-fat-induced lean MAFLD. Clarifying the relationship between DRF and lean MAFLD may inform guidelines for specific populations, such as individuals practicing intermittent fasting or those working night shifts, while also suggesting potential therapeutic strategies for clinical management.