The calories in vegetable lasagna vary with the ingredients and preparation you use. However, you can use a standard frozen veggie lasagna as the mark against which you compare your favorite recipe to guesstimate how many calories you’re about to eat.
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The United States Department of Agriculture notes that a typical serving of baked frozen vegetable lasagna is 1 cup. Each serving of veggie lasagna has 314 calories.
Calories from Fat
Every gram of fat has 9 calories. One cup of vegetable lasagna has almost 14 g of fat for almost 123 calories from fat.
Calories from Carbohydrates
According to MedlinePlus, 1 g of carbohydrates has 4 calories. A serving of veggie lasagna has more than 32 g of carbs, giving you more than 128 calories from carbohydrates.
Calories from Protein
A single gram of protein also has 4 calories. Each cup of vegetable lasagna has almost 16 g of protein, accounting for more than 62 calories from protein.