Agree with the above, plus a comment that at your age, 110 HR rides are much too easy to do anything. Here's a thing to try: Go out on the bike and spend 20 minutes or so warming up at your easy pace. Then gradually increase your effort while noting your breathing. At 110, you'll be breathing slow and easy. As you pick up the pace, you'll gradually start breathing more deeply, but still fairly slowly. At some fairly exact point in you HR, you'll notice that deep and slow no longer is enough. You'll suddenly have to definitely increase breathing rate. Note that HR. Ease off, let your breathing slow back down and test it again. That HR is the HR to travel at when you're trying to do moderate work between hills. No point in riding much below that effort. Seek out hills on your rides. "See hill, ride up it." Nothing so steep you have to walk, no point in that. Nice 15 minute hills are good. Plenty of hills in the Portland area. I've had the best results losing weight from simply eating smaller portions. Gradually cut back on them. Your stomach will adapt.