2, pineapple is rich in sugar substances, sugar is easy to dissolve and water, overnight will promote the growth of bacteria, easy to cause diarrhea, abdominal pain and other symptoms of discomfort after eating, but also let the pineapple bubble foam soft, affecting the taste, so try not to pineapple soak water soak overnight. If you can't finish the pineapple, you can wrap it in plastic wrap and then put it in the refrigerator, and finish it within 2-3 days.