For some people, losing weight and making positive body changes is about trying to make yourself more attractive to potential partners. It's even said that when we enter into a relationship and settle down, we stop taking as much care of our bodies because we're no longer 'advertising' ourselves to potential mates! This young man already had a girlfriend, and she took both of these pictures. He made these changes for himself - but nobody's prouder of him than she is.
The 'before' picture here is of a 16-year-old who knows full well that he doesn't look great. He's overweight, and he's wearing multiple layers of clothing to hide his body. The picture on the right was taken on his 21st birthday. At some point during those five years, he's put himself through a lot of hard work and effort to shake off that weight, and he's very happy about it. Just look at that beaming smile!