Pesto has 418 kcal and 37.6 g fat per 100 g. A tablespoon (15 g) adds 63 calories – as much as some entire condiment portions. Portion errors for calorie-dense foods reach 50–200% (Almiron-Roig et al., Appetite 2013). The basil-oil-cheese base makes pesto one of the most calorie-dense sauces; weigh every serving.
How should I track Pesto?
Pesto is high in calcium. Small amounts of Pesto add up faster than most people realize. A systematic review (Whitton et al., Adv Nutr 2022) found that condiments are among the most frequently omitted items in food logs — skipped 1–80% of the time. A tablespoon of mayo or dressing can add 50–100 calories, and most people use two or three tablespoons without measuring. The fix is simple: keep a teaspoon or scale near your plate and measure once. Sauces and dressings are often the hidden reason a "healthy" salad ends up at 600+ calories.