<human>: Hi friends,

I was much fitter in the past, but in the past two years I put on some weight due to school (almost no free time + stress). But now I've decided that this can't go on, so I'm trying to get fit again. I'm 6'2", 19 years old and I weighted 200lbs on Jan 5.  

I got myself a gym membership and started exercising 4-5 times per week. I did some weightlifting with cardio in the beginning, but then I changed to cardio only (mostly the transport machine). I plan to go back to weightlifting after I lose the weight I want. According to the machine, I should be burning 3000-4000 kcal per week. 

I've also changed my diet. I'm eating almost no junk food and more healthy food. I'm eating about 1500 kcal/day, except on Saturdays - my junk day - in which I eat about 2500 kcal. I very rarely feel hungry after a meal. 

Everything was going great until two weeks ago. I'd lost 13lbs in this 1.5-month period and my body looked much better already. But since then I've been stuck. I still do the same diet and exercises, but I haven't lost anything in these two past weeks. I've heard that weight loss plateaus are common, but I'm getting somewhat frustrated now.

Is there something I can do to continue losing weight? Or should I just wait more?

Thanks in advance!

Could you distill the essence of the text into 1-3 sentences?
<bot>: Lost 13 lbs in 6 weeks after changing my diet and starting to exercise, but then hit a plateau (while maintaining these new habits). Help?