I'm doing medifast through one of the centers. I'd definitely bring up your concerns during your next meeting. I get weighed weekly, they ask about any challenges, offer tips, I get tested to see if I'm in ketosis, etc. Monthly, they take measurements and stick me on this machine that calculates body fat percentage, muscle mass, all that good stuff, basically to make sure I'm making good progress and to make sure I'm not losing muscle, which is really important to me since I'm pretty athletic. When I first started, they took my weight, blood pressure, body analysis, and made me go get a complete blood work up and sent all the information to a doctor so that I could be cleared to start the program. All of that was during my first routine weekly meeting though (I officially started on a Wednesday, but I wanted my weekly meetings on Fridays, so I was back in 2 days), so maybe they're waiting? They should have been more forward about the process and what to expect, and definitely should not be slacking as far as getting your weight/measurements/etc. Don't be afraid to ask questions though! Don't leave until you get satisfactory answers from them. It's what you're paying them for after all.
As far as your races, for the first ~10 days, I did cut back on my physical activity until I felt my body had adjusted to the new diet. I was told by the center's dietitian to increase my protein by a couple of ounces a day and to increase my carbs by eating more carb-heavy (but still medifast approved!) vegetables when I'm particularly active (this probably had to do with my ketosis levels being extremely high for weeks though, I'd ask your dietitian for something tailored to your needs). I cycle and I'm training for a couple of 100+ mile rides in the next few weeks. I haven't had to do anything different diet-wise during the training, but I am a little concerned about the day of - carbless fueling? omg!
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