Sounds like an excellent exercise plan. Not sure what about a
treadmill makes people old, but if you don't like it, it's not a huge issue.
Sounds like you're well on your way, and honestly, losing more than 10 lbs in 4 weeks is only going to come from a loss of muscle mass. I started off losing about 2.5lbs per week, and when I added in
strength training, I have slowed way down on the scales, but I can see the difference in
body fat vs muscle.
Although it's mostly about
calories consumed vs expended, you really should eat a lot of your daily
calories by lunchtime. You should consume most of your
calories early in the day to fuel your
body. It makes for better workouts and improved
energy levels throughtout the day.
Staying hydrated helps your
body function better as well. I know it's very hard ot do on a busy schedule, so do the best you can. Preparing the night before can help you with your lunch, and with your fluid intake. Hope that helps.