Do you think someone can live without food or water for more than a month?

I have heard about lots of Yogis and Rishis who lived in Ancient India without food and water for several months and even several years. We have even seen a few cases in the recent times as well. Prahlad Jani is a living example for this. He stopped eating and drinking at the age of 8. I personally feel it is possible. What do you think. Please share your views.