Human and animal health intersect at many points, including the waistline, according to experts who attended the Waltham International Nutritional Sciences Symposium. Owners contribute to pet obesity through excessive feeding coupled with insufficient activity, experts say. They also may exacerbate the issue with a generally indulgent style of interacting with their animals or other styles of pet care, said veterinarian Alex German. "If veterinarians can predict (pet owner) parental style, perhaps they can more effectively prevent obesity," Dr. German said. Also on the agenda were the future of food animal production and topics related to pet diets.