I'm making a general comment here:
WOULD YOU BOYS WHO WANT YOUR GIRLFRIEND TO HAVE A BODY LIKE A FIGURE COMPETITOR PLEASE STOP STARVING THEM AND WORKING THEM LIKE RENTED MULES?
In fact, no
normal adult human being, whatever gender, should be consuming 1200 calories a day (or less). In fact, I doubt if any woman who is 5'5" or taller and exercising regularly should be consuming less than 1500 calories, period.
Stop thinking that because they're girls they can live on two lettuce leaves and a rice cake. Stop thinking that they're girls so they need more cardio. You're not doing anyone any good and it's counterproductive.
Encourage them to eat whole foods with adequate protein (stop encouraging them to take in all their calories in protein shakes). Get them to build up a nice muscle base (which will increase their metabolic rates), and have them do regular, SANE cardio. I promise you, boys, they
will lose weight, and more importantly, they will lose it healthfully and it will be sustainable.
And just like a man, if
she's losing more than a pound or so a week it's NOT reasonable, because then she's just burning muscle up.
And finally, THE SCALE SUCKS. If you have a girlfriend who is about to undertake a new regimen with the goal of losing fat and "toning up" (gaaaa I hate that phrase) then TAKE MEASUREMENTS, or really splurge and get her DUNKED, but STOP LIVING AND DYING BY THE SCALE, WOMEN DO THAT ALREADY.
A gallon of water weighs 7 pounds. It's very easy for a woman's weight to fluctuate by 5 to 7 pounds (even more, sometimes) depending on where in her cycle she is, how hydrated she is, how many carbs she had, if she had any alcohol, etc., etc., etc. Also, muscle tissue holds water when it's been injured (you can hold up to two or three pounds of water after weight training). Finally, HOLD THIS IMAGE IN YOUR MIND:
The equivalent amount of fat is NEARLY twice the size of lean muscle tissue. That's why the SCALE IS BULLSHIT as a measurement of success. GET A DARNED TAPE MEASURE! TAKE PHOTOS OF HER IN A BATHING SUIT!