‘I gave up soda and now I’m skinny!’

With the Board of Health expected to approve Bloomberg’s supersize-soda ban tomorrow, The Post challenged seven New Yorkers to quit fizzy drinks. Two months later, they’ve lost an astonishing 53 pounds! Zandy Mangold (L) / Tamara Beckwith (R) Sally Sockwell, 64, actress, Tudor City “I got into the habit…