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Previous studies suggest that circulating fibroblast growth factor 21 (FGF21) levels are elevated in patients with fatty liver, while fasting-induced secretion of FGF21 is lower in obese patients. It has been reported that soy protein prevents hepatic fat accumulation and induces FGF21 secretion. The present study was designed to evaluate the response of circulating FGF21 levels to feeding and fasting in mice fed soy protein-rich diets. For this, C57BL/6J mice were distributed into control, high-fat high-sucrose (HFHS)-casein protein, HFHS-soy protein, and HFHS-β-conglycinin diet groups. Plasma samples were collected after 10 and 11 wk either in dark periods with feeding conditions or light periods under fasting conditions using a crossover design. After a 12-wk period of feeding, HFHS-induced hepatic fat accumulation was significantly reduced in the groups fed HFHS-soy protein and HFHS-β-conglycinin as compared to that in the HFHS-casein-fed group (p&lt;0.05). Plasma FGF21 concentration was significantly higher in the dark/feeding periods in the HFHS-casein group (p&lt;0.05), while in the HFHS-β-conglycinin group it was higher in the light/fasting periods (p&lt;0.05). The amount of mesenteric fat was significantly lower in the HFHS-β-conglycinin group than in the HFHS-casein and HFHS-soy protein groups (p&lt;0.01). The fasting-induced FGF21 secretion was significantly and negatively correlated with hepatic fat content (p&lt;0.05). The present study revealed that hepatic fat accumulation was associated with lower fasting-induced FGF21 secretion, which was regulated better by dietary intake of soy protein. These results support the preventive effects of soy protein on central obesity.

Hepatic Fat Content Is Associated with Fasting-Induced Fibroblast Growth Factor 21 Secretion in Mice Fed Soy Proteins