How Many Calories Are In a Subway Sweet Onion Sauce?
                                
                                
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                                    4 min read                                
                            
                                According to nutritional data, a standard 1.5-ounce serving of Subway's fat-free sweet onion sauce contains approximately 40 calories. While many view this sauce as a light alternative, it is crucial to understand its nutritional profile to make informed dietary choices and properly track calories.