I really have difficulty understanding how my weight works. Lately, I have felt trimmer, think I look trimmer, and am fitting into jeans that I haven't fit into for about 2 years. Last time I weighed myself, I was almost 3 lbs down. Now today, feeling even trimmer, I am back up to my usual these past years. I certainly haven't built up any muscle mass. It's almost as if lead in my bones comes and goes. I know that if I follow a formal diet where I track everything and keep calories/fat under a certain amount, I will lose weight, but it's just so strange.