You must take in approximately 3500 calories less
than the amount needed for you to maintain your current weight to loose 1
pound. There are formulas out there that include your current weight, sex,
and activity level that then give you a maximum daily caloric intake
to loose (x) pounds per week. Generally they recommend 1-2 pounds per
week maximum.
I'm going out to ride right now, and I couldn't
find the formula quickly, but I will look for it if anyone is interested.
To the body, a calorie is a calorie is a calorie.