Department of Health News This news item expired on 6/30/2013, so the information below could be outdated or incorrect. Health Facts You May Not Know... Americans are the heaviest people in developed countries. The U.S. surgeon general has called obesity a national epidemic. 61 percent of Americans are overweight. Consuming an extra 100 calories daily for a year, without using them up, can lead to a weight gain of 10 pounds. Every gram of carbohydrate or protein equals 4 calories. The number of overweight people in the world - 1.1 billion - now equals the number of undernourished people. With each decade as we age, we need 100 fewer calories per day. Every gram of fat equals 9 calories. 10 calories a day (2 hard candies) of unexpended energy puts on an extra pound a year.