The 22-year-old actress - who stars in vampire TV series `True Blood` opposite her fiance Stephen Moyer - admits the worst thing about the programme is the corn syrup used in bloody scenes.
She said: "I get a kick out of it, but the actual bloodmakes me want to gag! It`s some kind of sweet corn syrup, I think, with an aftertaste that`s less than pleasant after the 10th take. In season one, they asked me if I wanted sugar or sugar-free. I was, like, `Sugar-free blood? Sounds great!` Big mistake. Because then it only tastes like the latex tubes it`s coming through.
"By the next scene! I was feeding ravenously from Bill`s arm, so I drank probably a gallon. Never again!"
Anna also revealed she has no problem with nude scenes and would rather bare all than be given a skimpy costume that barely conceals her body.
She added to Self magazine: "If I had let the oh-God-my-body-is-going-to-be-on-display-all-the-time part of it mess with my head, it would`ve killed True Blood`s chance of being something that made me really happy.
"Oddly, I find the nude scenes to be a lot less stressful than just constantly being very skimpily clad.
"I`m quite comfortable with being naked but spending 18 hours a day wearing little tank tops that could fit a two-year-old and shorts that barely cover my butt? For me that was an adjustment. That said, I never think about it now."