The head of the Endocrinology Research Institute at Iran University of Medical Sciences said: About 60 to 80 percent of people in many countries suffer from overweight or obesity, and this figure is about 70 to 75 percent in Tehran.

The head of the Endocrinology Research Institute at Iran University of Medical Sciences said: About 60 to 80 percent of people in many countries suffer from overweight or obesity, and this figure is about 70 to 75 percent in Tehran.

Referring to the limited effectiveness of many old weight-loss drugs, he said: These drugs usually cause a weight loss of about 5 percent and rarely reach 10 percent, but new drugs can cause a weight loss of 15 to 20 percent in some people.