The most significant obstacle is overcoming your inner self.
The hardest part of weight loss is not the exercise or nutrition, it is motivating you mind to make a change.
Unfortunately, there is no magic bullet to being successful in weight loss. Eventually, we all have our health fade, but we can extend our own healthy by making good decisions. All of the excuses in the world will not help you reach your goal, but if you are determined, you can maximize your success.
The bottom line: The key to weight loss success is overcoming the obstacles to weight loss. The biggest obstacle is your own mind. The hardest obstacle is not reducing calories. Instead, it is getting your mind in the right frame of thought to make a change.