A high percentage of body fat, may increase inflammation in your body, especially if the percentage is over 30%. Your body can appear thin when you have a higher body fat content.
Body fat may release inflammatory chemicals, note researchers Antonino De Lorenzo, MD, and colleagues, who didn't test that theory in this study. De Lorenzo works at Rome's University of Tor Vergata. Chronically high levels of inflammation have been associated with a host of health problems, including heart disease and arthritis.
Those who were overweight or obese had the highest levels of blood fat(LDL) and bad cholesterol (triglyceridestriglycerides), which are both inflammatory chemicals. Web MD reports on a study published in the January issue of American Journal of Clinical Nutrition.

Both groups of women with normal BMI had similar levels of cholesterol and other blood fats, regardless of their body fat. All the women had normal blood pressure. None had heart disease and none smoked, abused alcohol, or used birth control pills. Though the study showed evidence of women with normal BMI having high percentages of body fat, and elevated levels of inflammatory chemicals, the diet, exercise and genetics were not looked at.