Eating an entire 13 oz bottle of Nutella in one sitting is not recommended as it is a high-calorie food and may lead to discomfort or digestive issues. Nutella contains a lot of sugar and fat, which can cause a rapid spike in blood sugar levels and may contribute to weight gain if consumed in excess. It's important to maintain a balanced and varied diet to ensure that you are getting all the nutrients your body needs to function properly.

If you are experiencing any discomfort or digestive issues after consuming the entire bottle of Nutella, it's best to seek medical advice. However, if you feel fine, then it's unlikely that you will experience any serious consequences from consuming the entire bottle of Nutella in one sitting. However, it's important to be mindful of your food intake and to avoid overeating in the future.