What specific foods should Active Teenagers limit or avoid and why?

Soda:
• Full of sugar, corn syrup, and other sweeteners.
• Most soft drinks are packed 150 empty calories.
• Lots of Caffeine (30-55 mg of caffeine per one can of soda)
• According to some studies, soda has been linked to bone

weakening, obesity, tooth decay and heart disease.

Potato Chips:
• If you eat just three ounces a week, in one year you'll have consumed 23,400 calories.

Doughnuts:
• Deep fried.
• Filled with sugar.
• Have 19 grams of fat.
• Store-bought doughnuts contain 35-40

percent trans fat.

Salt:
• High intake of salt thickens and stiffens arteries and increases the risks of strokes, and cardiac failure.
• Sodium chloride draws calcium from your bones, which is excreted in your urine. This leads to early and painful osteoporosis, or the thinning and fracturing of your bones.

http://www.healthassist.net/conditions/food-avoid.shtml