London broil, a steak dish, is made with top round. Although London broil is not as lean as chicken breast, it's lower in fat and calories than some other types of steak and can be enjoyed in moderation if you assess the nutrition facts.

According to LIVESTRONG's food database MyPlate, a single serving of London broil (approximately four ounces) contains 140 calories. MayoClinic.com and MyPlate indicate that it would take about an hour of indoor walking for an average 160 pound person to burn off all of the calories in a serving of London broil.

A serving of London broil contains six grams of fat, according to MyPlate, including 2.5 grams of saturated fat. Although fat is necessary for proper health, the USDA recommends limiting saturated fat intake to just 10 percent of your daily calories.

The main source of calories in London broil is protein. MyPlate states that a four ounce serving of London broil contains 19 grams of protein. According to Healthline.com, the average man should consume 56 grams of protein a day, while the average women should consume 46 grams of protein a day for optimal health.

The free LIVESTRONG MyPlate calorie tracker app for iPhone and Android has helped millions of people lose weight the healthy way — by getting support from an active community as they track their eating and exercise. Consistently a top-rated app, MyPlate offers the latest technology in an easy-to-use tool that includes millions of foods and recipes, 5-minute in-app workouts and a robust support community.