Is the Tuna Sub at Subway Healthy?
                                
                                
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                                    4 min read                                
                            
                                According to nutrition data, a standard 6-inch tuna sub at Subway can contain up to 530 calories and 31 grams of fat, significantly higher than many other menu options. So, is the tuna sub at Subway healthy, or is it a hidden high-calorie choice? The answer depends heavily on preparation and toppings.