Before we start calculating BMI, let’s discuss what BMI is, and what it isn’t. BMI, or the body mass index, is a tool that’s used to determine whether or not a person is at a normal weight for his or her height. It was invented between 1830 and 1850 by mathematician and scientist Adolphe Quetelet. Though it’s been almost 200 years since he created the BMI, it’s used today almost exactly as he outlined.
While BMI isn’t the final word in whether or not someone is at a normal weight, it’s one of the first tools often used to determine if someone’s overweight. Because the BMI doesn’t distinguish between weight from fat and weight from muscle (other tools must be used to determine the actual amount of fat) it doesn’t work well for very muscular people like athletes. But for most of us, BMI is a pretty accurate measure of whether we’re underweight, a normal weight, overweight or obese.
Calculating BMI isn’t difficult once you understand the formula. The basic formula is weight divided by height squared, or kg/m2. You simply take your height in meters and square it which means you take the number of meters times itself. Then divide that number into your weight in kilograms. So a person who’s five-and-a-half-feet tall stands about 1.7 meters. To get 1.7 meters squared, you simply multiply 1.7 times 1.7, which equals 2.89. Now, convert weight to kilograms.
So if someone weigh 200 pounds, that’s about 91 kilograms. To determine the BMI of someone about five-and-a-half-feet tall who weights 200 pounds, or who stands 1.7 meters tall who weights 91 kilograms, we divide the weight by the height squared, or 91 divided by 2.89. That gives us the result of about 31. This individual is classified as obese. How do I know that?
A BMI of 18.5 or below indicates an underweight person. The normal weight range is from 18.5 to 24.9. Overweight people will have a BMI of 25 to 29.9. A BMI of 30 or greater indicates obesity. So a person with a BMI of 31 is in the obese range, but not by much. By calculating BMI again with different weights, you can see that the person would only need to lose 5 kilograms, or about 11 pounds, to no longer be obese, but merely overweight. And a loss of 19 kilograms, or about 42 pounds, will put this person within a normal weight range. Calculating BMI to determine how much weight one should lose can be a big help for someone who’s not sure.
Calculating BMI can be made even more simple if you’re not sure how to convert to kilograms or meters. Simply take your weight in pounds times 4.88. Then divide that number by your height in feet, squared. So a 200 pound person who is 6 feet tall: 976 divided by 36 = 27.1. After calculating BMI, it’s clear this person is within a normal and healthy weight range.
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Here are some ways to lose weight fast.
1 – Take everything one step at a time. Begin simply by paying more attention to what you are eating, slowly cutting back on the bad foods and implementing more healthy foods into your diet. Once you have this under control, the next step is to add exercise to your plan. If you do not like exercising, take this one step at a time as well by implementing only 15 to 30 minutes at a time, at first.
2 – Choose foods and activities that you enjoy. If you do activities that you get enjoyment out of, you will find them to be much more successful than trying to exercise in ways that you do not enjoy. The same goes for foods that you implement in your diet: Choosing foods that you enjoy will help you enjoy your diet rather than craving bad foods.
3 – Build muscle. You lose calories based on your weight. Muscles, surprisingly enough, burn calories more quickly than fat does, pound for pound. Work out with weights to build muscle and lose weight, and then allow your extra lean muscle mass to burn more calories for you on a long term basis.
4 – Reduce your carbohydrates. Do not cut your carbohydrates out completely, because your body needs carbohydrates for energy. Cut out some of the white breads and pastas from your diet, though, to cut down on the carbohydrates that you consume. What carbs you do need to eat, you can replace with whole wheat and brown carbs for better health.
5 – Set realistic, measurable and attainable goals. Put deadlines on your goals, making them measurable. Make them realistic by choosing goals that you know you can attain. Set long term and short term goals and you will more readily achieve your expectations regarding quick and healthy weight loss.
6 – Give up the bad stuff. It may surprise you how unhealthy it is to eat candy, cookies, cakes and other sweets, and to drink soda and sugar laden drinks. Cut these bad goodies out either completely, or at least 80% of the time and the pounds will shrink away without you having to do much else to make the weight loss happen.
7 – Have a suitable breakfast. Most of your calories should be consumed early on in the day, and breakfast is no exception. Eat a nice breakfast to give your metabolism a good foundation to run from for the remainder of the day.
8 – Control portions by leaving something behind. Make sure your portions are correct based on the actual serving size of your food, and then make sure not to clear your plate completely. Exercising portion control will give you better control over what you put into your body for easy and achievable weight loss.
Implement these tips one by one and in no time at all you will begin to see a significant difference in your weight.
Filed under Weight Loss by Weight Loss