As long as he's burning more calories than he eats, he's chipping away at his subcutaneous fat. Gotta keep him moving, Kano -- that's the secret to weight loss. Calorie restriction + exercise is more effective together than either one alone in losing weight in a healthy fashion.

BTW, one of the greatest mistakes I see new cyclists make, especially those who begin cycling to lose weight, is thinking that riding a bike is a free license to eat anything they want. Because you burn more calories (than if you didn't ride), you're also more hungry. But you need a basic understanding of how many additional calories you're burning. Riding an hour a day doesn't merit increasing your caloric intake by 2,000 calories. I recommend using a tool such as FitDay.com to estimate your caloric needs. And if you find you're gaining excessive amounts of weight, you might want to rethink your overall nutrition plan.

Oh, something else I found interesting is that when folks begin an exercise program (such as cycling), they also sleep more (at night) and take more naps. Remember, you burn roughly half as many calories during sleep as you do at rest, so by sleeping more, you reduce your daily caloric need. If you reduce it more than you've increased it by exercising, you actually need to reduce your caloric intake to offset the difference even though you're now exercising.