I realised that I needed new pants - I only had two pairs of jeans and one pair of white dress slacks that were fit to be worn in public (ooops also have quick drying camping/canoeing pants). I trotted off to the local clothing store and looked along the racks. Grabbed a few pairs in 'my' size to try on. Weird - they were too big. The saleslady brought me some more pants a size smaller. Even weirder - still too big. My pant size had changed, quite magically, from an 18 to a 14!
When I got home I looked carefully at my partner and realised that he too had lost some weight. No dieting, no extra exercise, no change in meds. The only thing different is that some time back we started eating real butter and not stressing about fatty meat. Actually, we now eat much as we did twenty years ago when we were lighter in weight.
Unless someone else has a viable theory I'll thank my altered diet for the more slender size!