Lasagna has 135 kcal per 100 g. Pasta, cheese, and sauce stack into a calorie-dense layered dish. A restaurant slice runs 250–400 g and 400–700 kcal. Portion errors for calorie-dense foods reach 50–200% (Almiron-Roig et al., Appetite 2013). Weigh your slice once.
How should I track Lasagna with meat sauce, frozen, prepared?
Prepared foods like Lasagna with meat sauce, frozen, prepared can be tricky to track because the actual serving you get often differs from the label. Restaurant and deli portions are typically 30–50% larger than the stated serving size. A meta-analysis of dietary reporting (Wehling & Lusher, Am J Clin Nutr 2021) found that people underreport calorie intake by 25–30% on average — and prepared meals are a major contributor. The safest approach: weigh your actual portion as served. Also note that homemade and store-bought versions of the same dish can differ significantly in calories due to cooking methods and ingredients used.