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One large hard-boiled egg that weighs 50 grams has 78 calories. With 1.6 calories per gram, a hard-boiled egg is a low-energy dense food. Energy density refers to a food's calorie count compared to its weight. Foods with a low-energy density fill you up on fewer calories.
1 Boiled egg whites contain around 3.6g of protein and the essential amino acids people must get from food sources. You should aim to ensure that 10 percent of your daily calories come from protein sources.  Low calorie. A boiled egg white only contains approximately 17 calories, while a whole egg contains 72.