Off-topic - Nice chart! I'm impressed you have that much info over the years. I wish I did!! It might've encouraged me to keep the losses off and not regain them. LOL
On topic - I was kinda wondering the same as Beka. That maybe the lowest goals are your end game. So to speak?
You asked what makes you stop dieting and what makes you start again...
My major weight loss the time before last I don't remember how much I lost altogether, but I do remember that I just got tired of the dieting. I'd gotten down low and just felt like I was tired of watching what I ate and really missed my favorite foods I had strictly cut out.
My last major weight loss I was trying to get back to my high school weight in time for my wedding. Once I did and we married I started gaining again. I'd mistakenly thought once I controlled what foods came in the house it would be so much easier for me to continue losing. Not so!! It was actually harder! LOL
This time I realized I was now in my early forties and I had spent my ENTIRE life obese and several of those years in the morbidly obese catagory. I've never known what it's like to be skinny. I want to know now. I'm determined to know. This time I've stuck with it longer than ever before and I believe because I have the amazing support and knowledge that the wonderful people of this forum give and the awesome tool of MFP to help me I can not only lose it but maintain the loss as well. I feel smarter about losing the weight this time because my view of approaching the loss is changing the way I eat for life. NOT by doing a 'diet.'