Also helps to take a look at your ride / post-ride nutrition. For example, in my average 30miler I burn about 1150-1200 calories (I'm 150 pounds, but my rides have a lot of climbing). I usually go through two water bottles mixed with cytomax and one Gu. That's 300 calories on the ride. When I get home I use endurox R4, which is another 270 calories. So I replace about 570 of the burned calories, with the added benefit of timing to promote recovery.