Washington, April 24 : Mia Farrow has bulked up in a bid to prepare for a three-week fast, which has been planned to draw attention to the humanitarian crisis in the war-torn Darfur region of Sudan.

The actress will begin her water only strike from the end of April (09), despite doctors fears she could cause irreversible damage to her body.

Farrow has admitted that she''s a `little bit' scared about going on the strike, but has gained weight to help her body cope with 21 days without food.

"I gained nine pounds. That is about as much as I could gain in a month because I know I am going to lose a fourth of my body mass. But that will quickly go. I am just eating fruit and vegetables this week and I am reading certain things and spending time with my kids, trying to be quiet, because among other things it is a very personal and spiritual journey," Contactmusic quoted Farrow, as telling People.

"I''m taking vitamins this week, but when I wake up on Monday, April 27, it will be strictly water," she added.

Farrow also admitted that the strike may not last the full three weeks - because of her small frame.

"I am going to try for three weeks. Given my weight, that may not come to pass. I am going to get my blood tested after two weeks and if there is organ damage, I will have to stop. But my goal is three weeks," she said.

"I won''t be able to go to the doctor at that point, someone is going to have to come to the house and give me a blood test," she added. (ANI)