I suspect you have triggered an age/BMI combo which is why it's a problem now and not before... I worked with a extremely fit triathlete who had to do an operational check as his standing heart rate was too low. The doctor who did the check took one look at him and said 'next'.
Good luck in passing your check, I suspect it won't be an issue unless you are physically unable to get in an out of your seat and your resting mass is touching things it shouldn't when in the seat...
Still a little motivation to loose a few kgs must be a good thing? I've seen a few people get put on a weight loss program with a target BMI, without a suspension, but threat thereof if they didn't shape up, but that's on the ATC side not flying side.