I started full time ebiking almost two years ago for purely treehugging reasons. Okay, maybe not purely. I do enjoy the simpler lifestyle, getting out into nature a couple of times a day, and the premium parking spaces bikes always get at the grocery store. What it was doing to my body was more subtle and harder to notice. I just happened to have a doctor's appointment right before I sold my car. I compared the results of that to what I measured yesterday and was pleasantly surprised. I have always tended towards the slender side, eat a reasonable diet, and get enough exercise. My doctor never whines at me about the typical middle age sloth and spread and the health problems that go along with them. This is why the change was more unexpected.
Before: 118 / 79
Now: 108 / 75
Before: 155 lbs
Now: 148 lbs
I'm not sure I could sell many books with "lose 7 lbs in two years by pedaling your butt off", but it worked for me. I think the big difference is a modest amount of exercise, twice a day, every day. At least now when someone asks if it has improved my health I can answer with an emphatic yes read them the tale of the tape.