An apple a day keeps the doctor away, which is a great thing because it does not take much to have an apple ready for a bite. All it takes is a little washing. But, some people will insist that the skin be removed before they can sink their teeth into the fruit. This is a shame, actually, as the peels hold a bunch of nutrients. If you peel your apple, you simply won’t get all that the fruit has to offer.

Here are some reasons you might want to hold on to apple skins.

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1. Half the fibre is in the skin

A medium size apple holds 4.4 grams of fibre. This is essential for the food you eat to journey smoothly from your stomach until it is ejected. Any shortage of fibre will lead to constipation and inefficient absorption of nutrients.

2. Milk all the fruit’s vitamins

You most likely aren’t eating the apple just for its sweet taste. Chances are, you are also hoping to milk it for its vitamins. But for you to reap every vitamin the fruit holds, you will need to eat the peels as well. Take vitamin A for example. The whole fruit has 8.4 milligrams of the vitamin but without the peel, you only get 6.4 grams. There are 98 international units (UI) of vitamin A but this falls down to 61 UI if you lose the peel.

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3. Ease breathing problems

If you are prone to breathing problems, or if you would like to keep them at bay, a couple apples every week might do the trick. But the caveat is that you have to have the peels as well. The magic compound is quercetin but most of it can only be found in the peels. According to a journal that was published in the US National Library of Medicine, the compound was found to promote lung health in individuals who consumed 5 apples per week.

4. Fight obesity

In a 2012 study involving mice, the ursolic acid that is found in apple peels was found to play an important role in the fruit’s ability to keep weight down. Ursolic acid aided the production of muscle and brown fat, and these speed up the burning of calories.