Even a Few Extra Pounds Risky
A large recent study by the National Cancer Institute of people aged 50-71 found, not surprisingly, that obese and underweight people had greater risk of premature death than people of a healthy weight.

But the study also found that non-smokers who were just overweight (Body Mass Index* of 25 to 30) were 20 to 40 percent more likely to die prematurely than normal-weight people.
More evidence for the importance of maintaining a healthy weight.
* Here’s a Body Mass Index (BMI) calculator.