The use of supplements is a controversial issue with some body builders. There's no doubt that giving your body a little bit of help at the right time can be awfully profitable. However, there's no reason to picture that additions can replace an essential part of your diet. At best, they're going to be ineffectual and at worst, they'll be negative in a real sense.
Many folks will have met somebody who has replaced part of their diet with a supplement and saw the effects, which would put anybody off the concept of supplements for good. If you skip part of your diet and put a supplement in its place, you may luck out on all the nutrients that that meal would give you. It's not atypical to hear of somebody suffering plain physical unwell effects from the wrong use of additions, because they suspected a supplement could replace something they required. For once and for all they can not.
The protein, carbs, fiber and other necessary parts of a nutritious diet can be reinforced in effect by additions.
They can't get replaced, and you may feel awfully sick terribly quickly if you try. This isn't to claim that you shouldn't ever take a supplement. At certain points in the middle of body building they can be of use, but it's important to ensure you use them in the correct way. You can't build a place using only quick-drying cement. Get the foundations and the framework in place before you even think about using something more specialised. Otherwise the house will fall down.