Anyone watching their sugar levels knows to eat healthy, watch refined carbs and avoid sugars. Although someone with diabetes needs fiber and fruit, higher sugar fruits like pineapple have a high glycemic index. These should be combined with with low GI foods and eaten sparingly. Some foods combined with pineapple can reduce the sugar spike associated with the fruit such as oatmeal, pasta or legumes. On the other hand, pineapple should not be combined with white flour crackers or bread and instant foods like instant oatmeal.