Lately, I've been eating somewhere around 700 calories a day, but some days it's more like 500. It feels like this satisfies me though, because I'm never too hungry during the day (I'm naturally not he hungriest person). I'm also a small person (5 ft 2). However, I've been feeling sluggish. I'm sick (I have a cold and I might have mono...) but still, I'm worried.