Sugars are needed as fuel for cellular respiration; the energy yield can be measured as calories.

Most Americans overconsume this essential nutrient.

• High sugar usually yields high calories.

• Low sugar may not mean low calories.

• High carbs may not mean high calories.

  high-sugar donuts

  low-sugar high-calorie bars

  high-carb low-calorie granola

Note: A 150-lb person burns about 80 calories per mile of walking.