Why Is the Relationship Between Obesity and Periodontal Disease Under

Why is the relationship between obesity and periodontal disease under investigation in clinical studies?

A) There is no clinical evidence that there is a relationship.
B) The increase in obesity in the United States makes it a health risk.
C) Obesity increases the inflammatory burden and periodontal disease is an inflammatory disease.
D) Cross-sectional studies prove that obesity increases the incidence of periodontal disease.