Yikes Slipper!
I don't think you could keep anything alive on that! Consider if you are especially cycling, you'll need more energy than that to keep up your energy levels.
When you get the chance, take a look at the food pyramid sometime- you aren't even coming close to the recommended nutritional guidelines, and with the increased exercising, you need even more food than that.
If you get the chance, look around for a nutritionist in your area who can take you through your exercise routine and can recommend some healthier eating habits that keep your taste buds from getting bored.
Unsolicited advice, but I just thought I'd intervene for a min.
Koffee