The Chocolate Challenge

So, I was challenged by someone...she will remain nameless, so let's call her uhdaM. There is a famous "e-mail forward" that goes around, propounding the mathematical "prowess" of Chocolate. The challenge was to figure out why it works.

Below is the actual forward. I'm challenging you to figure out how/why it works. I will post the answer in the comments section in a day or two (or after I realize noone reads this blog...whichever comes first). :)

Step 1. Choose a number from 1-10, how often you would like to eat chocolate in a week.
Step 2. Multiply the number by 2 (just to be bold).
Step 3. Add 5.
Step 4. Multiply it by 50 -I'll wait while you search for a calculator.
Step 5. If you have already had your birthday this year, add 1756. If not, than add 1755 instead.
Step 6. Now subtract the 4-digit year you were born.
Step 7. You should have a 3-digit number.

The 1st number (the "leftist" one) should be the original number you pick in Step 1 (how often you would like to eat chocolate).

The next two numbers are....Your Age!

*the forward than pretends that this is the only year that it works (well I guess in a way that's true), so we should all spread it around. I would also like to add, that it is the forward that adds the "calculator" statement in Step 4. I found that rude!).

SO, I will pose the same question to you, that I was asked by uhdaM...how and why does it work?! :)