Will I lose weight doing this?

If you make losing weight too complicated, like you seem to be doing, you will get sick of trying. Just imagine having to keep tabs on EVERY single calorie you consume and all the nutrients you get in a day. The key to losing weight is creating a new lifestyle, not going on a "diet" that will show results this month, but then you get sick of your diet and you start back into your old habits. At this point you noticed that despite losing 15 pounds dieting, you've gained back 20 from discontinuing that diet. This means that you cannot deprive yourself of food, especially when your body requires the energy to do your workout. Many people wrongly assume that you must burn more calories than you eat in a day. This is incorrect. Your body requires those calories for other bodily functions. Your body uses energy (calories) even when you are resting. The key is to eat moderate amounts, and watch out for the junk food. Do not completely deprive yourself of those foods that enjoy though, because soon enough, you'll go on a binge...and empty your cupboards of everything. You still need to treat yourself...just not as often. As for working out, I try to do a mix of weightlifting and cardio. I'm not sure if my source is valid, but I read somewhere that weightlifting tears your muscles slightly, and when you're at rest, your body uses calories to repair them. So basically, the weightlifting will help you lose weight even when you're at rest. Kind of makes sense, since you do feel soreness after weightlifting. Anyway, as for cardio, 70-80 minutes really isn't necessary, unless you're not running on a high enough intensity. I do roughly 45 minutes of cardio most days: 30 mins on exercise bike, approx. 10 mins on elliptical machine, and about 5 mins are rowing machine. This usually amounts to an estimated (by the machines) 600 calories. These 45 minutes are fairly intense, though, with my heartrate climbing to about 180 beats per minutes, sometimes 190. High intensity workouts work the best. Although, I'm not sure if my heartrate getting that high is safe...doesn't stop me, though. Now, I don't work out like this every day, just most days. So, don't keep tabs on every single thing you eat, because that will annoy you after a while. You have to create a whole new mindset. You have to start eating right without having to think about it. It's the same idea of eating how you used to. When you ate unhealthy, were you really thinking much about it? Well, now you're going to have to start eating healthy without being conscious of it every second of your day. After all of this, you may wonder why you should take my advice. Well, I've lost a little over 35 pounds after almost 4 months of this new lifestyle, and I'm pleased with the way I eat...I don't feel deprived, and I definitely DON'T count calories. Good luck in your endeavors.