Is It Possible to Be Healthy and Overweight?

Yes, according to Mr. Mercola. It's the same with thin and unhealthy. You probably seen a lot of it on TV. But there are far more unhealthy overweight people than thin people.
The health risks of obesity are fairly well known by now. Obese adults tends to have higher rates of high blood pressure, abnormal lipids, cancer and diabetes. The vast majority of people are treated with costly medications that don't address the real problems but rather cause further deterioration of health.

The side effects alone from all of these medications can overwhelm your system, but even after adjusting for "traditional" risk factors like high blood pressure and high cholesterol levels, obese adults also face increased risks of:

Silent vascular disease (blood vessel disease that causes no symptoms)
Atherosclerosis (hardening of the arteries)
Thicker heart walls

Changing your diet is a big help towards a healthy lifestyle. But please don't do it only for a short time. You need to change your diet forever. You will not see the result if you only do it for a week. I read a book about this young man who basically have to eat dirt (minerals and such) from his father land just to get better. The doctors suggested to removed some part of his intestine and told that he will not live long after. And that was it, he already he is dying and tried everything just to get better. Ditto, the very same cure is found in his own backyard.

You see, not everything will be cure by medication made by pharmaceutical company.