Vascularity (appearance of veins in the arms, chest, etc) is a complete function of body fat percentage and muscle mass content (more muscle/less fat = greater vascularity).

In fact, when I had a 43 inch waist and 20%+ body fat, I had no veins showing in my arms, chest, etc, but as I lowered my body fat percentage into single digit levels, I noticed the appearance of veins in my forearms, chest, biceps, etc. As body fat declines, the space between skin and muscle decreases, thus veins become more prominent. More muscle also aids in this process, as additional nutrients are needed due to the larger muscle groups, and thus the veins appear more pronounced.

Remember, a PROPER bodybuilding diet and weight training program leads to dramatic increases in muscle growth and reductions in body fat. I have achieved tremendous success (over 60 pounds of muscle gained and 50 pounds of fat lost), so am now helping men and women around the world to transform their bodies naturally through my IncrediBody Transformation Program.