The difference between Greek yogurt and regular yogurt is that Greek yogurt is strained to rid it of much of its whey, which is the milky liquid that's found in yogurt. Straining also removes lactose, or milk sugar, from the yogurt.
Straining makes Greek yogurt thicker, richer and creamier than regular yogurt. Moreover, it has more protein than regular yogurt, while having half of the carbohydrates and half of the sodium. It is also rich in probiotic cultures, which are live bacteria that support the health of the digestive tract. Greek yogurt is also a good source of vitamin A, zinc, potassium and calcium. Plain yogurt not only has more carbohydrates than Greek yogurt, but often has fruit and sugar added, which causes the carbohydrate content to spike.
Because of its fat content, Greek yogurt can also be substituted for other fats, such as butter and cream cheese and mayonnaise, in both sweet and savory dishes. This still provides the mouth feel those other fats impart while lowering the calories and raising the protein levels. One 150-gram serving size has 8 grams of fat, and 20 milligrams of cholesterol. It has no trans fat. Greek yogurt is also available in a nonfat variety.