Is there a relationship between body weight and aaa?

Not really. Weight does not have anything to do with aaa. The most important risk factors are smoking , high blood pressure and age. Genetics is also a big factor as a history of AAA in a parent or grandparent. Basically if you are a smoker and have high blood pressure with a history of AAA in a parent you should have an ultrasound to see if you have an aneurysm.