Many of the diets don't seem to work because we're not all that committed to them. But with cholesterol under control and not a whole lot of body fat, and reading about these high protein, low carb diets, it seems like that might be a good opportunity. A diet is what a person eats during their lifetime. There are also a few disadvantages to a high protein diet. I'm just beginning the diet and have lost a few pounds for whatever reason.
Carbohydrates tend to hold more water than does protein.
Consequently, a high protein and lower carbohydrate diet modification will contain less water. Less water, less weight. This might explain your reduced body weight because of a shift onto a protein-focused diet plan. There is plenty of evidence to support periodization of training. As a scientist, I tend to look for any scientific evidence behind testimonials.