Who is most likely to gain health benefits from dieting?

A) A person with a BMI of 26 who is able to lose weight but gains it back
B) A 55-year-old who has gained 15 pounds over the past 5 years
C) A person who was 25 pounds over ideal weight but has already lost 15 pounds
D) A person who is 40 pounds overweight and is able to lose 10% of body weight

The person who is 40 pounds overweight and is able to lose 10% of body weight is the most likely to gain health benefits from dieting. Losing just 10% of body weight can lead to significant improvements in blood pressure, cholesterol levels, and blood sugar control. The other options either have a lower amount of weight loss or have a BMI that is not significantly high enough to warrant major health benefits from weight loss.