What Juice Has the Most Calories? Exploring the Most Caloric Juices
                                
                                
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                                    4 min read                                
                            
                                An 8-ounce serving of 100% prune juice contains approximately 176 calories, making it one of the highest calorie-dense fruit juices by volume. However, some concentrated juice blends and smoothies can be even more caloric, packing a hefty dose of sugar without the fiber found in whole fruits.