Regular updates from credible sources impactful for current affairs preparation for UPSC include following reputable news outlets, government portals, and research publications. Subscribing to daily news briefings or using apps that consolidate news can assist in staying informed efficiently. Engaging with various formats, such as podcasts and webinars, can broaden understanding of current events. Additionally, synthesizing information from multiple sources encourages critical thinking and discernment of facts. This disciplined intake of information ensures candidates can confidently address current affairs in exams and interviews.