Lemon peel has 47 kcal and 10.6 g fiber per 100 g. The peel contains far more fiber than the juice. Lemon zest is used in tiny amounts (1–2 g) — negligible in a macro budget but adds flavor without calories.
How should I track Lemon peel?
Lemon peel is high in fiber. When tracking Lemon peel, weigh the edible portion — after peeling, coring, or removing seeds. The part you throw away does not count, but it can make up 20–40% of the total weight depending on the fruit. A systematic review (Whitton et al., Adv Nutr 2022) found that fruits are among the most commonly misestimated food groups. One more thing to watch: fresh and dried versions have very different calorie density. A handful of dried fruit can have the same calories as a whole bowl of fresh — always double-check which form you are logging.