Exercise, nutrition and weight loss are three separate and distinct ideas that our culture has collapsed into one idea when we think about losing weight. Therein lies the problem. Exercise for weight loss: If you are overeating, it's almost impossible to exercise enough to counteract the effects. It takes a 200 pound person 30 minutes, walking 2 miles per hour, to burn off 1 ounce of tortilla chips or 2 tablespoons of ranch dressing. If the main reason for exercising is to lose weight by …