Different sadhanas (means of accomplishments) are prescribed in our scriptures for different ages. Tapa (Penance) is recommended for Krita age, Jnana (Knowledge) for Treta age, Yajna (Sacrifice) for Dwapara age and Dana (Charity) for Kali (present) age. Of all the charities, giving food is the best one. We are much perturbed, when we get no food at noon. Other beings feel similarly, under similar circumstances. After knowing this, he who gives food to the poor and hungry, is the best donor or charitable person. The Taittiriya Upanishad says that "Food is Brahma; from food all the creatures are born and having been born, by food they live, and having departed, into food again they enter".
From Shree Sai Sat Charitra, Chapter 38.