On the topic of "all american" diets - I've found the best way to trim down is high-intensity interval training. I used to go for 30-60 minute runs which did very little for functional, rugby fitness and just ate away at any muscle mass. I've started doing a lot of ergs - 300m in a minute, 1 minute rest x 10...absolutely knackering and melts the fat off.
this is the sort of training im very supportive of, my whole training regime is effectively built around high-intensity training, whether that be weight lifting or cardio
even when i do squats, bench, dips or snatch, i will construct it around a high intensity circuit, i still get the muscular development benefits whilst also getting a fantastic fat burn and cardio workout. Obviously if i reduced the intensity i could get bigger gains in weight lifting and bulk, but as i said earlier, this isnt my training aim, lean muscle is my goal.