Like the above poster said, everyone displays the concequences of their health and diet in different ways :) Some may have a constant mental fog or irritability, or bad PMS, or thinning bones, or back problem... the possibilities are numerous. You just can't see them in the way way you can acne.
Be grateful you have Acne now and are fixing the problem, before the elevates into someone much more serious :) Those people with great skin but eat junk food will be sicker as they grow older. You can only get healthier!