Hi. It depends on your visa type. For mine 457 I had a panel of bloods, chest X-ray, urine, and full physical exam including height and weight. Very cursory to be honest.
What is your bmi? (If you don't mind me asking?) if it is just overweight you should be fine. They might question it if your bmi is >30. My bmi was underweight and the doctor told me that have to refer on anyone whose bmi is out with normal (18.5-25), unless they can be convinced there is no negative consequence on health.