PPARA and metabolic syndrome: PPARα is mainly expressed in metabolically active tissues and is not only used for treating dyslipidemia [58] but also for regulating glucose metabolism [59], maintaining vascular endothelial function balance in diabetes [60], protecting diabetic patients’ visual nerves, inhibiting oxidative stress, anti-inflammatory, anti-diabetic kidney fibrosis, promoting neural repair, improving neural microcirculation, and reducing vascular regeneration injury, all of which play an important role in the chronic complications of diabetes [61,62,63].