I am on the small side too. My first flush, I drank all the juice. I have done 11 flushes since and only drink the juice occasionally- maybe on 2 other flushes. I did the malic acid twice. I don't find any difference, personally, between when I drink the juice, use malic acid, or skip all of it. Also, I did a 30 day juice fast and then flushed- horrible idea. I had no bile to flush everything out. It was my least productive flush and made me feel the sickest. I did some research later, and they say not to flush after a fast like that for this very reason.