A low calorie source of protein — One egg is about 75 calories yielding 6 grams of protein, 5 grams of fat, 62 mg of sodium, and 0 carbohydrates (<1% of a gram). Compared to a popular protein bar on Amazon: 180 calories, 21 grams of protein, 6 grams of fat, 220 mg of sodium, and 24 grams of carbohydrates.
Cost effective — Organic, large brown egg is about 35 cents (conventional egg is about 12 cents). Protein bar is $1.87 = 5 times more expensive than an organic egg.
Eggs have added nutrition — Choline, vitamin D, B vitamins, zinc, and selenium and no artificial ingredients. Protein bars often contain added sugar, and may have as many as 300 calories per bar.