Improve your blood sugar. an egg for breakfast may lower your blood sugar levels for the rest of the morning and improve overall blood sugar levels.. How many calories are there in a hard boiled egg? there are 78 calories in one hard-boiled egg. eggs are low in sugar, high in protein and contain 14 grams of total fat.. Popsugar; fitness; healthy recipes; hard-boiled eggs with avocado meet the easiest low-carb, protein-packed breakfast ever. Continue reading →