I wouldn't say so. It won't show as quick or as much on someone obese opposed to someone skinny due to the layer of fat over the skin.
By dieting and exercising, always under medical supervision.
Same as on earth. That is. From 40 kg to 120 kg.
More weight to lug around and probably an all over lower level of muscle tone and activity.The extra weight (the hang over) pulls on your lower back.
Because of the extra weight, there's so much strain on everything - not just the lower back.