text: i weight 175 lbs... how much weight will i loose if i eat 1500 calories a day for 30 days...?   i read somewhere that eating 500 calories fewer than ur body needs should help u to lose one pound a week. the average woman needs about 2000 cals to carry out her normal daily activities.  losing 1-2 ibs per week is healthy. any more than that is no good. so u are on the right track