Understanding How Many Calories Are in 1 Cos Lettuce Leaf
                                
                                
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                                    3 min read                                
                            
                                A single inner cos or romaine lettuce leaf has about 1 calorie, and a larger outer leaf has about 5 calories, showing a slight difference based on the size and location of the leaf. This makes cos lettuce a low-calorie option for salads and wraps.