I'm one of those odd men out as I have actually lost weight since starting T, and my appetite is much lower now. This could be because my stomach as shrunk a little or maybe its the food that I eat, but I rarely feel hungry at all. For about the first two months on T I had to force myself to eat some days because I just had no appetite. There are days when I feel super hungry (today is one of those) but I just wait. Dieting is mostly about portion control. I have smaller dishes now that I live in Asia, so what I do is fill up that plate (about the size of a saucer in the states) and that is my portion. Once its gone its gone. In the last three months I'm down 39 pounds (about 17.5 kilos), and I keep dropping a little at a time.
The best diet advice I ever got was pretty simple: you just have to be hungry sometimes. If do I get the munchies or want to eat a lot, I typically just do something else. Believe it or not, those hunger pains pass if you just keep yourself busy. Don't get me wrong, I'm not saying you have to starve yourself - that is not healthy at all. But, when you get insane cravings, just try and ignore them. It worked for me pretty well before I got on T when I was trying really hard to lose weight.