First of all: I really really liked Thrive. It has been an amazing thing to acquire and I didn't regret it for a second!
There have been quite a lot of changes in my nutritional habits. On the one hand because I ate with the "bodybuilder"-mentality of getting calories every 2-3 hours. On the other hand I did achieve this quite often through junk or insane amounts of nuts and stuff like that (e.g. Coke Zero instead of water).
So at first I really was like "OMG how can I maintain even a tiny bit of mass" and was feared of getting so hungry even my keyboard would look quite delicious. But just a few weeks later I was astonished by how well it went for me. I almost never felt hungry and still had more energy than the whole time of training before! And even though it might not be asked yet to remove anything inbetween meals, I did reduce the size and frequency of my usual snacks. All that happened just because I didn't really feel in the need for them. Also I didn't lose any muscle or strength at all and still got no hunger or lacks of energy because of that. It's truly amazing how those seemingly little changes can affect you THAT much!
Besides your programming is really well thought in my opinion. Replacing bad food/drinks step by step was just THE way to go for me. Each step I was like "hm, 1l of water instead of coke. You can do that". And it worked out. No lacks of motivation, I don't even miss a lot of that food I used to eat. The weeks just pass by and you wake up surprised how easy and naturally you adapted so many tiny steps into one big change.
Can't wait for Thrive Level 2!