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It takes the energy from 50 leaves to produce one apple.
Are Apples Really Good For You?
You bet your Apple Brown Betty they are!

Not only are apples good for you, but they are mighty tasty too and may bolster your weight loss efforts.
The State University of Rio de Janeiro studied the effect of fruit intake on weight loss. They found that overweight women who ate three fruits a day, either apples or pears, lost more weight on a low-calorie plan than women who did not add fruit to their diet.

Fruits like apples and pears are “low energy-density” foods. They are low in calories and high in fiber, leaving you feeling fuller longer. Apples are a natural appetite suppressant! Research also shows that eating a high-fiber diet decreases total calorie intake, which leads to weight loss.
Apples also lower the risk of heart disease and strokes, fight cancer, make teeth whiter, prevent diverticulosis, keep the digestive tract running smoothly, lower cholesterol, and protect against asthma.
Juicy and sweet, apples are only 80 calories, and they provide 5 grams of dietary fiber. They are a good source of iron, potassium and vitamins and are also rich in flavanoids and antioxidants.
Something to Think About ~
The Environmental Working Group, a non-profit, public interest watchdog organization based in Washington, D.C. notes that 91% of all apples have pesticides on them.
The Environmental Protection Agency (EPA) assures us though, that our food is safe. They have set limits on the amount of residues considered acceptable on the produce we eat. Acceptable levels are those that show no significant health risk when ingested over a lifetime. Research shows that by the time your fruits and vegetables make it to your home, pesticide residues are well below those limits.
But be sure to wash fresh fruits and vegetables properly before eating. Water may not be enough to remove all the pesticides. Your local health food store should have a veggie/fruit wash available.