Do apples have negative calories

Nothing has negative calories (as far as I know). One average Apple has about 81 calories.

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No, an Apple, along with all other foods, contain calories. The concept of a "negative calorie" food comes from foods that require more energy to digest than the calories the food provides. One common food that is claimed to have "negative calories" is celery. This is because celery has very few calories, about 8 per stalk, and requires effort to digest. Celery is mostly water, with a cellulose structure. Cellulose cannot be digested by the human body, and is therefore passed through without being digested.

An Apple on the other hand has lots of sugars that can be processed by the body. I have no doubt that there are more calories in an Apple than the body expends to digest said Apple. This does not mean that an Apple is bad however. Just not a "negative calorie" food!