I just saw my PCP on a monthly basis for 6 months (make sure you don't miss one month) where he took lots of notes about what I had been eating and if I'd been able to exercise; of course, they also weighed me and tested my blood sugar (I'm diabetic or I was until after my surgery
); in addition, I went to Weight Watchers (the nutritional consult). I'd ask them if you can do this through your PCP.