One small change can lead to big results. Many small changes or one major change can lead to tremendous results but it can also lead to devastating negatives like noncompliance with your fitness program. In other words if the changes are too many or too drastic you might decide to abandon them and go back to your old, comfortable ways.

If you can foresee this happening to you, or have experienced it in the past I recommend making small changes and only one at a time. Pick one part of your lifestyle that you're pretty sure you can successfully change. Stick with that change until it becomes a permanent part of your routine. Allow that new habit to influence other changes.
For example eating a more nutrient rich diet or getting more quality sleep will lead to increased energy which in turn can help you feel more confident about starting and sticking to an exercise program. Or if you start working out regularly your body will start to send you signals to feed it good stuff, not junk. Then it's just a matter of discipline for you to not override those signals.

Keep focusing on each new change until it becomes a regular habit. Don't try to do too much all at once. It doesn't need to be an all or nothing approach. Remember if it's too drastic you could be setting yourself up for failure.

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