I'm 6' 0". I've always eaten pretty balanced diet when I cook for myself. All I did was simply cut my portions in half. After a few weeks, my stomach shrunk enough to where I wasn't hungry. I satiated my hunger between breakfast and lunch with a high fiber snack, whether it was an apple or some instant oatmeal, with plenty of water. I'll drink easily over half a gallon of water just at work alone. I never really counted calories but I'd estimate my average daily intake to be roughly 1500 kcal. Anything goes on weekends, within reason. I'll go out to dine on weekends since I don't spend any money on restaurants during the week. But I'll still follow my practice of portion control so I'll often bring back leftovers or I just won't finish my food because I'm satisfied. I'll also just try to pick smarter options when I dine out. My exercise routine built up gradually.
I didn't really start exercising until August of 2010. I lost 10 lbs alone just from cutting intake. But when I started exercising, I needed to strengthen my heart and just get acclimated to high heart rate activity. So for the first month or so, I just did 30-45 minutes of straight high heart rate cardio on an elliptical machine 5 days a week, keeping my heart rate above 160 bpm, if those gauges on the machines are worth two shits. After a while, that got boring/easy so I stepped up to another cardio machine that was more challenging, but still easy on the knees because I still weighed about 300 lbs. Once I dropped to 290 lbs, I wanted to step it up a notch since I'd been doing straight cardio for like 3 months at that point and I can't stand repetition for 3/4 hr. I remember reading about HIIT on the Something Awful forums a few years prior and decided to give it a shot on the bike, since running was still to hard on the knees at my weight at the time. So I continued to lose another 30 lbs. doing HIIT. Simply 6 intervals (1 minute high, 1 minute low) @ a max. heart rate of ~170 bpm 5 times a week. Around 280-290 lbs., I started to run on the treadmill. Pretty slowly, just about 4.5 mph, but enough to run a full mile without having to stop to walk in the middle.
Pretty much I've been continuing with the same HIIT schedule 4-5 times a week. I've thrown in actual sprinting into my HIIT occasionally, if I don't feel like going to the gym. Running around the neighborhood for only roughly 15 minutes seems pretty good if I don't want to go to the gym. Everyone recommends HIIT mixed with weight lifting but I haven't lifted weights since my last roommate tried starting going back to the gym. He didn't stick with it so I continued with my personal regimen since it was working. So honestly, all my weight loss can be attributed to eating less and incredibly vigorous exercise 5 times a week (typically Monday-Thursday and Saturday morning).