Beef balls, egg tarts and barbecue pork puffs. They’re classic Hong Kong treats, but health officials warned diners Wednesday that like many morsels on “dim sum” restaurant menus, the snacks are loaded with sodium and fat. A new government study urged people to avoid fried foods that can cause obesity and heart disease. People should order more steamed buns, noodles and rice dishes at Hong Kong’s famous dim sum eateries — big, noisy restaurants popular for brunch or lunch with family, friends or clients.