This is a great question, and I noticed that the previous answer said "overweight has nothing to do with the percentage of body fat," and went on to regurgitate all the useless BMI (body mass index) info on the net, which is quite incorrect and indicative of how little understanding there is out there of this topic.
"Overweight" has everything to do with body fat percentage - body fat is the whole reason why the term is used. It certainly has nothing to do with how much bone, muscle, organ, or water weight you are carrying. The BMI formula attempts to estimate your "overweightness," or more accurately, your overfatness, using only your body weight, which is absurd, but it is done because it's easy to measure and collect loads of data on. Ideally, body fat % should be measured instead, but it is a little more difficult to measure accurately without expensive equipment.
The general guidelines are, for men, over 20% body fat is considered overweight, and over 25% body fat for women. Keep in mind these definitions are nebulous though. What is important is the range body fat to strive for to avoid the bulk of the risk factors associated, and of course we all want to look good too. For men, a good healthy range is 8-16% and for women a good range is 14-24%. Incidentally these ranges unfortunately completely fall below what is average for Americans of both sexes.
You height and body structure determine how fat you can be to be considered overweight. Your BMI, or body mass index at a healthy weight should be from 18.5 to 24.9. You are overweight if your BMI is between 25 and 29.9.
If a person is overweight, it may not necessarily mean that he or she is not fit. If the reason for being overweight is due to muscle mass, then it is quite OK. However, if the reason for being overweight is due to body fat mass, then action is probably needed to lose weight. In this instance body fat percentage can help to distinguish between overweight due to increased muscle mass (no cause for concern) or due to body fat (need to lose weight). A good bathroom body fat scale can measure body fat percentage.
A person is considered fat or overweight/obese, if they have a high BMI (Body Mass Index). That is their weight in proportion to the height.
Obesity is normally determined by Body Mass Index. Accurate determinations of body fat percentage are highly problematic. Typically a person with BMI > 30 would be considered obese and would have a body fat percentage of 25% or more.
should show a low body fat percentage
fat
No, body fat doesn't give them energy
One can calculate the percentage of fat there is in their body by using the Body Fat Percentage Calculator provided by Healthy Forms which lets you calculate the percentage of fat in your body.
Overweight no, higher percentage then boys-yes.
To calculate the percentage of body fat loss, you can use the formula: (Initial body fat - Current body fat) / Initial body fat x 100. This will give you the percentage of body fat lost.
At 110 pounds and 5'1 you are not considered fat you have a BMI of 20.8 which is normal. If you hit 140 pounds you'll be considered overweight
Fat means there's excessive weight and overweight is a condition which implies having more body fat than optimally healthy.