You need at least 2000 calories to live if you are female, more if you are a male, even more still if you are eating a fruit based diet. You will not last on a fruitarian diet if you don't eat more! Don't be afraid of the fruit, if you are on a fruitarian diet then it is your main calorie source. mango is about 130 calories. 5 of these is 650 calories (i think!). 650 calories a day is anorexia. Before long your body will cry out for more nutrition/calories and you will crave what your body recognises as the most calorie dense food - which will likely be fatty junk food.
Please go to 30bananasaday.com or read the 80/10/10 diet by Douglas Graham for more information on how to thrive on a fruit based diet.
To answer your question, you are definately not a pig!