Why should the frequency, intensity, and duration of your cardiovascular workouts stay the same? They should not, especially if your goal is fat loss and health.
When you're trying to get trim and lean, increase your cardio training to two to four times a week, to help strip away remove body fat.
Alternate your cardio methods so your workout's not so boring -- treadmill running one day, elliptical training or rowing the next, cycling the day after that, etc
You want to keep your interest level up and your body guessing to see fat loss!