Of course you can ride! Just start out slowly, with a comfortable heart rate. Make sure you drink enough, and maybe even eat a snack if you plan on being out an hour or so. For sure, don't start on an empty stomach- you won't have the energy to ride. You'll be able to burn off a 100-200 calorie snack easily.
Go as many days a week as possible! If you are counting calories in general, just don't add back in the hundreds you burn. Even 45 minutes to an hour a day is effective!!
Nanci
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"...I'm like the cycling version of the guy in Flowers for Algernon." Mike Magnuson