Hi Kiki. Congrats getting started on a fitness routine along with your diet. When you go off the phen and you start to eat a little more "normally" it's the exercise that will keep the weight off.. plus it's good for you !
In regards to your question about lifting.. it is very difficult (if not impossible) to put on muscle on a reduced calorie diet.
You need to eat 300-500 extra calories a day to gain weight.. if you are active most of it will be muscle.. if you don't exercise.. well we know what the extra calories turn into then.
There are a few reasons you still need to lift when dieting. The main reason is exercise , esp. weight training, will protect your existing muscle from being burned. When you diet, your body can either burn muscle or fat. You are going to burn some muscle when dieting no matter what, but you want to keep it to a minimum.
Another reason is to help boost your metabolism, as mentioned before in another post. The last reason, I mentioned above. When you go off the phen and go back to eating more it will help keep the fat off.
Don't worry about getting big muscles like a man when you go back to eating more. Most women do not have the hormonal enviroment to pack on lots of muscle. Female body builders are usally using steroids, lifting heavy free weights and eating a ton protein and supplements. If you do ever find your muscles looking too big, just back off the weight training and up the cardio for a while. They will shrink up in a few weeks.
Good luck and keep up the good work.
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