The bodybugg is an amazing piece of technology. You wear a sensor on your arm that contains an accelerometer, galvanic skin response meter, a muscle thermometer, and a pedometer. You enter your personal details into the computer and link the bodybugg to the program. It uses a combination of those details and the readings from the various sensors to calculate the amount of calories you have burned.
You then go onto the website and log what you ate. It gives you a graphic that shows you the calories burned vs. the calories taken. It gives you your deficit or surplus. You tell the computer how much weight you want to lose and at what rate and it will calculate how large your deficit should be a day. You can tell it if you would prefer to move more, eat less, or a combination of the two. It will give you a meal plan you can follow that will help you meet and stay within your suggested caloric intake. You can customize it by answering a questionnairre with your eating preferences. You can also view an anyalysis of where your calories are coming from in terms of fat, protein, and carbs.
For a separate price you can get a watch that not only tells the time, but also gives you readouts from your bodybugg on steps taken and calories burned. This is a great way to see throughout the day how you are doing and give you motivation to step it up.
I love my bodybugg. It definitely keeps me accountable. I don't really use their menus, but instead count points to plan my day. Then I put the food into my bodybugg to see how well I am doing with my surplus/deficit.
This is what the basic screen looks like with your results: