How does Chapter 38 explain the significance of food donation, or 'Annadan', in the context of the different ages (Yugas)?

According to Chapter 38, the path to spiritual merit differs across the ages. The scriptures dictate that Penance was key in the Krita age, Knowledge in the Treta age, and Sacrifice in the Dvapara age. For the current Kali age, however, Charity is highlighted as the proven means for spiritual progress. Within the practice of charity, the chapter elevates food donation, or Annadan, as the foremost among all deeds and the "highest secret for quenching hunger." This emphasis is rooted in the idea that food is the very form of the Supreme Reality, making its donation a paramount virtue, a principle Sai Baba himself upheld.