The change in your "friends" attitude towards you after your weight loss has everything to do with the utility that your friendship with them served them, as their "fat friend." This is why, when people lose weight, they lose their "friends."

But, actually, the weight loss, is a signal to these "friends" that your role in their life has changed. You are no longer "weak" and "easy to manipulate" or "someone they conveniently ignore." When you lose weight, you regain your self-worth, your self-esteem increases. Because, when you lose weight, you show the world that you value yourself. And to the "friends" who are fair weather, well, this is bad news for them, because it means to them that now they can't get away with treating you as poorly as they did before.

Now that you have lost weight and regained your self value, you hold yourself to a higher standard, which means, you hold others to a higher standard. You no longer are willing to put up with people's crap and abuse. And the wrong kind of people will notice this change, with weight loss, in the people they never really valued in the first place. But who the hell wants those people in their life?

And, many times, when we make changes to our inner life or outer appearance, the reaction of our friends and family reveals A LOT about the level of value we serve in those people's lives. Sometimes, we find out, we served no real value if they suddenly are unavailable to talk to or hang out with, or they are suddenly mean or standoffish.

But in the long run the weight loss is a great way to shed the wrong people, as well as the pounds. Keep that in mind.