On average, a 3 oz. portion of American lamb is lean, contains only 160 calories, and is packed with hunger-curbing protein—a perfect combination for weight management, according to research. Research suggests that eating protein can help preserve lean body mass while you're trying to lose weight. On average, a 3 oz. portion of American lamb is lean and delivers approximately 50% of your daily protein needs. Protein is an important part of your plate because it can lower the blood sugar impact of meals, according to research. On average, American lamb delivers approximately 23 grams of protein per 3 oz. serving. This is approximately 50% of your daily protein needs.