Effects of eating junk food

Question
Hi, I hope I'm asking the right person about this, I'm not sure where this question should be directed. Sorry if this is too long.

I have a question about if your body can convert to using junk food better/or ag sood as than regular food as long as protein and carb needs are met. Since I was 14 I have been lifting weights (25 now), the past 3 years I have been doing it very consistantly 3-5 times per week, every week. I weight 180 and 20% body fat. My first question is, is 20% bodyfat healthy, I don't believe all the bodybuilding magazines about how you should aim for 6% etc, but is 20% too high?.
2nd, due to my lack of nutritional knowledge at 14 I use to goto the weight room for an hour then a bit of a swim, then goto the store and eat like 3-4 candy bars and a few packets of chips with some whole milk, all through my younger years I ate like this. the past 3 years I have been learning about nutrition and putting it into practice, eating proper carbs, not alot of suger, veg, eating very clean. I want to add muscle so I have been tracking calories and Protein/carb/fat grams as well as my weight and bf%, experimenting with calorie amouts etc. but I have noticed when I do this my bf% goes up or stays the same and my weight goes down. when I get frustrated I take a break and go back to eating what I want, candy, whole milk, energy drinks, and I end up losing a little body fat and adding a couple of lbs.
How is this possible, have I ruined my mataboism in my younger years?
Thank you, John


Answer
Hello John!
  
    Thank you for your nutrition question.  I would need your height in order to determine whether you are at your ideal body weight.  I don't believe you have ruined your metabolism.  This ususally happens only when you gain and lose large amounts of weight constantly.  However, there is a supplement that can help keep your metabolism healthy.  The product is called Juice Plus and contains 17 organic fruits and vegetables in a capsule.  It can be purchased from my website http://www.juiceblend.com  Since you are training I believe you can benefit greatly from this product.  Let me know if you need more information about it.  Hope this helps.
-George

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