Before we get started with this one - there is absolutely nothing wrong with the way the girl on the left looks here. We think that's around the average body type, and the majority of people would be very happy to look that way. If you're not though - and this girl wasn't - then there's equally nothing wrong with changing the way you think about food and exercise to achieve a different result.
As you can tell from the outfit and the pose on the right, she's now a fitness model - and what an excellent model for fitness she makes! It looks like she's been working to put on some muscle as well as dropping those few extra pounds she was carrying, and there isn't an inch of her which isn't perfectly toned. Staying in this kind of shape is very demanding - but when looking this good is the reward, there's plenty of motivation to do so.