This is not size acceptance. Size acceptance is when you accept and are happy at your current size. If you are trying to gain, you do not accept your current size, just like if you are trying to lose, you do not accept your current size.
Size acceptance is a movement that is trying to diminish the anti-fat bias in culture, law and medicine. Culturally it supports the idea that you can be beautiful at any size, not just the thin image the media forces on us. We benefit from the movement but they would prefer we didn't make a big deal about our gaining. Size acceptance is a growing trend though. You can tell this by things like more stores carrying larger sizes and nicer clothes being produced for sizes that require more than one X.
