imy doctor goes by your bbmi under 45 one week over 45 two weeks of liquid 4 shakes a day and 6 snakes and could have 3oz grill chicken to replace one shake urury stuff. i think you should do a liquid acoording to your bbmi my dod said your liver and stuff has to be clear and so yo wont be so think in your linning in stomach. i think you should do a liquid diet any way at least one week before god bless you and your sister take care. ps snack are like jello soft stuff no candy or fruit.