By Jamie Leach
One large egg contains just over 70 calories and six grams of protein.
A serving of plain, nonfat Greek yogurt measuring 5.5 ounces contains just under 100 calories.
Not only is tuna high in protein, but it also contains essential lipids such as omega-3.
A one-ounce serving contains slightly more than 100 calories and almost 10 grams of protein.
Peanut butter contains just under 100 calories and close to four grams of protein per tablespoon.
If you want to maximize the amount of protein in a 100-calorie serving, part-skim mozzarella.