Science has gone back and forth on eggs over the decades, primarily over whether or not the amount of cholesterol outweighed the positives. Science is once again firmly back on the side of eggs, thanks to their lean protein. Studies routinely show that those who start their day with eggs instead of carbohydrates like bagels lose weight faster.
Eggs are also a great source of branched-chain amino acids, which studies show to aid keeping your metabolism running smoothly and at a consistently higher pace. Hard-boiled eggs, especially when made the night before, are a simple and satisfying breakfast, even for busy people on the go.