You may have heard that some fruits and vegetables require more calories to digest than they actually give, meaning eating them will actually make you thinner. Unfortunately this is wrong. While there are foods that have very few calories, you still only burn about 10% to 20% of their calorie intake. Let's take, for example, a stalk of celery that’s about 10 calories. While eating and digesting it you will burn about 2 calories, which means you still had an intake of 8 calories.
11. Onions are ridiculously healthy.

Sure they can make you cry and they make your breath smell terrible, but you should forgive them for all of that. The reason onions do those things is the exact same reason why they are good for you. Onions contain over 100 sulfide compounds which give a number of health benefits such as the prevention of asthma and some types of cancer. You don’t have to eat it raw, just eat it.
12. Pineapples are bad for your taste buds.
Pineapples contain an enzyme called bromelain which breaks down proteins in your mouth, namely your taste buds. After eating a pineapple your palate will be much less sensitive until your mouth can heal itself, which takes about a day. Pineapple is still a great fruit for you, but you should probably let a freshly sliced pineapple sit in the fridge for a bit before eating it. This will give time for the enzymes to break down and they will have a much weaker effect.
13. Apples can wake you up better than a cup of coffee.
It's hard to believe this fact so just try it for yourself and see. If you’re finding yourself a little low on energy during the afternoon then consider eating an apple in the morning. Thanks to its high carbohydrate, vitamin, and mineral content, an apple can give you a steady supply of nutrition to help you stay energized all day.