This is an older thread so not sure if you got it sorted out. Try using some basal metabolic rate calculator and working from there.
Here is one example: http://www.calculator.org/calculate-online/health-fitness/basal-metabolic-rate.aspx
This calculator puts my basal metabolic rate in calories at approx 1600. Plugging in the numbers you provided (with a wild guess of age 50) gets 1800 calories. Tour de France riders burn approx 4000-6000 (SWAG) during a typical stage of 5+ hours on the bike at professional race efforts. I am pretty certain no one is burning 2000 during a day at the office.
During a period I wasn't cycling I wanted to loose some weight. At 5'9" weighing 178lbs I got a number from some online tool saying it took approximately 1700 calories a day for me carry out basic function. I made sure to consume no more than that figuring any activity would be working away at the surplus. and did that for a little over 5 weeks ending up at 160lbs, loosing roughly 2-3 lbs a week. I had small snacks (100 calorie bags of crackers or chips) and fruit between meals to keep blood sugar normal but learned that feeling somewhat hungry had to become the norm if I wanted to meet my own imposed aggressive timeline. Had I been riding i would have compensated and added more calories. loosing more than 2lbs a week isn't highly recommended.
One example: I really enjoy cheeseburger deluxes with mayo on the fries. My plan to loose weight had no such provision. Instead I ate hamburgers (no cheese), with a side of corn instead of fries, and water instead of soda.
Another example: I love pizza. Instead of my usual two slices and soda, I would eat one slice with a diet soda.
Dessert? There is no such thing when trying to loose weight. Instead: I had an extra sugar in my coffee making it slightly sweeter than usual. An extra spoon of sugar is not that many calories when compared to a slice of pie a la mode.
Now that I'm back to roughly 10 hours a week on the bike I can eat whatever I damn well please.
In college I read a book called One L, about a first year law student. Apparently the secret to getting through law school is to learn to love the law. The secret to loosing weight is to become comfortable feeling somewhat hungry all the time, and after meals to not feel "full", that is not the normal feeling one is used to when living a normal life and eating at will. Unless a specialized chef is preparing specialized meals, or one is capable of doing so oneself via a book or some other means, one has to be really cognizant of what one is really putting in their bodies. Embrace feeling slightly "empty", making sure not to deprive yourself of adequate nutrition and it will happen.
Good luck if you are still trying to drop some weight.
PS: if you don't have a scale run out and buy one, checking weight every morning and actually seeing it happen is an incentive to keep going. I would see a half pound coming off every day or two. Don't fret if a couple days go by with no change. It's like building FTP, sometimes there's a sticking point but if consistency is maintained eventually the breakthroughs happen.
