So, you started going to the gym a lot and you started measuring your weight daily and and you lost weight and got healthier. (And also happened to change your diet.)

You aren't interpreting that sentence correctly. Before and after starting the diet, I was exercising approximately the same amount. Although it is possible that merely increasing the frequency of recording my weight had a (round-about) causal effect on my weight-loss, the magnitude of the effect doesn't seem very likely.