If you eat on behalf of others, their hunger is not satiated. On the other hand, with a good mind, if you do Japa, or good deeds, for others, it generates good vibrations and that works.

However, you will receive 3/4th the benefit and the person will get 1/4th the benefit. No matter what you do, 75% merit goes to you. So you must do a lot more good, if you want 100% benefit to reach the person you are praying for. It cannot be done with in a day.

(Q&A Session 5th June 2016)