Attaining your own perfect body is a great goal to have. Everyone should strive towards perfection in all areas of their lives... assuming you're enjoying the journey, and that "perfection" is healthy.
The concern I am faced with upon occasion is when a student's vision of perfection is unhealthy for them, or based upon faulty information.
For some people, their perfect body involves losing fat, gaining muscle/tone or other, more "magazine cover" typical goals. And that's fine.
For others, however, the opposite is true. For many people, females especially, gaining weight would bring them closer to their perfect body.
In today's society, often times "eating healthy" is associated with the loss of weight, while "eating junkfood" is associated with gaining weight. This is not always the case.
Muscle weighs more than fat, and there are very unhealthy "thin" people.
When I take on a new student whose goals are primarily weight loss, one of the first things I tell them is to have a specific body image in mind, rather than a number they associate with it.
Because a lot of time you may actually gain weight while losing inches on your jeans.
You might realize that having well defined shoulders and abs were actually your goals, not "losing 20lbs". Being able to run without gasping, or have a lengthily romp in the sack was actually your real goal, not "raising your metabolism to lose weight."
I'm not bashing the loss of weight as a goal, nor am I necessarily encouraging it. What I am stressing to you, the reader, is that with a healthy lifestyle, your body will gradually move towards its perfect state.
Fuel your body with quality food, move it regularly. If you don't need to shower at the end of the day, you're doing something wrong.
Simple enough? Great!
Now get out there and enjoy a happy, healthy, physical life!