Light butter cuts calories by ~30% versus regular. This one is 499 kcal per 100 g versus ~720 for full butter. The fat is diluted with water and skim-milk solids. Saturated content still runs 34.3 g per 100 g — the lipid profile is unchanged, only the energy density drops.
How should I track Butter, light, stick, with salt?
With calorie-dense foods like Butter, light, stick, with salt, a kitchen scale is your best friend. Research shows that portion estimation errors reach 50–200% for fats and oils (Almiron-Roig et al., Appetite 2013) — even a tablespoon off can mean 40–120 extra calories. Weigh on a scale rather than eyeballing — this applies to both liquid oils and solid fats like butter. If you use cooking sprays, note that "0 calorie" labels are per fraction-of-a-second spray — a realistic burst is closer to 5–10 calories, and multiple sprays add up.