Today, a new study published in the Journal of the American College of Cardiology that looked at 14,828 metabolically healthy Korean adults with no known heart disease found obese people had a higher prevalence of early plaque buildup in the arteries compared to normal weight people. The researchers defined obesity in the study as a BMI over 25; in the U.S. obesity is defined as a BMI over 35. The researchers conclude that even though these people may not have heart-related disease yet, their weight is still taking its toll on their health.