I'm 5'10"... I probably weighed 425-450 at my heaviest (I can't say for sure because I didn't have a scale that I could weigh myself on... my highest "recorded" weight was 415 at my nutritionist's office, but I had been losing a bit of weight on my own prior to that).
then I decided to lose weight and dropped down to 150 (but I looked like I had cancer, so I gained some weight on purpose... maybe a little too much, but I'm still pretty comfortably normal. currently wearing size L shirts and 33-34" pants. I'd kinda like to get back down to M + 32" this spring)
the absolute easiest thing you can do is cut out high calorie drinks. they're fucking horrible for you. not only are they loaded with calories, they do nothing to satiate hunger... if you're going to consume 250 calories of shit, you may as well just have a slice of cake. at least the cake will satisfy your hunger for a few minutes.
after reading some studies that linked diet sodas with increased hunger, I'd cut the carbonated beverages all together. stick with water (flavored or plain) and milk. if you drink coffee, replace your sugar with artificial sweetener and your cream with skim milk.
also, I've found eating breakfast to be super, super important (and specifically, a high protein breakfast. I usually do greek yogurt on work days and eggs on weekends). if I skip breakfast or eat a low-protein breakfast, I find myself hungrier earlier in the day, which in turn leads to an early lunch and then by the time I get home from work for dinner, I'm so ravenously hungry that I'll reach for whatever I can have on my plate in under 3 minutes rather than cooking a proper, healthy meal.