Posted this on the rowing forum, seems more applicable here:
My doc and I had a conversation - no diabetes threat, but the high cholesterol and high BP made up for that. I've been (mostly) effective in reducing my caloric intake, and I generated a workout plan (http://concept2.co.uk/weightloss/interactive) that I only skipped for a business trip (and lost 2+ pounds while away). I'm down 25 lbs from mid-Feb, making that 100# goal seem a little more attainable. Summer will be tricky, with vacations, cookouts, etc., but not impossible - early August is a motorcycle rally, with alcohol and bbq a'plenty, I figure if I can get in a 1-hr walk each day (doable), I'll be alright.
The next dietary phase is to reduce my fat intake to get a stronger carb ratio. I've been tracking all that using LoseIt, so I just need to figure out where the fat is coming from (there's plenty of low-hanging fruit to choose from, I doubt it will be too challenging).