The body mass index (BMI), or Quetelet index, is a statistical measure which compares a person's weight and height. Though it does not actually measure the percentage of body fat, it is used to estimate a healthy body weight based on a person's height. Due to its ease of measurement and calculation, it is the most widely used diagnostic tool to identify weight problems within a population, usually whether individuals are underweight, overweight or obese. It was invented between 1830 and 1850 by the Belgian polymath Adolphe Quetelet during the course of developing "social physics". Body mass index is defined as the individual's body weight divided by the square of his or her height. The formula universally used in medicine produce a unit of measure of kg/m2. BMI can also be determined using a BMI chart, which displays BMI as a function of weight (horizontal axis) and height (vertical axis) using contour lines for different values of BMI or colours for different BMI categories.

Some argue that the error in the BMI is significant and so pervasive that it is not generally useful in evaluation of health. Based on body mass index calculator research, University of Chicago political science professor Eric Oliver says BMI is a convenient but inaccurate measure of weight, forced onto the populace, and should be revised, so should the BMI calculator.

The medical establishment has generally acknowledged some shortcomings of BMI. Because the BMI is dependent only upon weight and height, it makes simplistic assumptions about distribution of muscle and bone mass, and thus may overestimate adiposity on those with more lean body mass (e.g. athletes) while underestimating adiposity on those with less lean body mass (e.g. the elderly).

A 2005 study in America showed that overweight people had a similar relative risk of mortality to normal weight people as defined by BMI. In an analysis of 40 studies involving 250,000 people, patients with coronary artery disease with normal BMIs were at higher risk of death from cardiovascular disease than people whose BMIs put them in the "overweight" range (BMI 25–29.9). In the intermediate range of BMI (25–29.9), BMI failed to discriminate between bodyfat percentage and lean mass. The study concluded that "the accuracy of BMI in diagnosing obesity is limited, particularly for individuals in the intermediate BMI ranges, in men and in the elderly... These results may help to explain the unexpected better survival in overweight/mild obese patients.

Body composition for athletes is often better calculated using measures of body fat ( body fat calculator ), as determined by such techniques as skinfold measurements or underwater weighing and the limitations of manual measurement have also led to new, alternative methods to measure obesity, such as the body volume index. However, recent studies of American football linemen who undergo intensive weight training to increase their muscle mass show that they frequently suffer many of the same problems as people ordinarily considered obese, notably sleep apnea, some say that's not the best workout. A further limitation relates to loss of height through aging. In this situation, BMI will increase without any corresponding increase in weight.

Start the planning your daily healthy eating plan, consider where you already. You might want to keep a food diary for one week, one day or more. Writing down everything you eat and drink then compare with what the food pyramid suggests you should be eat, This will offer a better idea of what you need to add to your diet -probably fruits, vegetables and whole grains- and what you could cut back on -for example: fat, meat, salt, -.

Here are some TIPS to get you eating better:

Swap soda with water, Water is calorie-free and makes you feel full, which is important if you're trying to lose weight. Water is also vital if you're exercising more than you used to. Don't think that just switching to diet soda is good enough; getting rid of all carbonated beverages is better for you.

Get whole grains at breakfast. Try oatmeal, toast on whole-grain bread, a whole-wheat English muffin, even leftover brown rice in an omelet. Starting your day with whole grains makes you feel full longer, and we all can use more fiber.

fruit for snacks. Most people don't get anywhere near the recommended number of servings of fruit daily. Get closer by packing whole fruit, natural applesauce or single servings of mixed fruit in light syrup for snacks throughout the day.

Eat more often. Conventional diet wisdom lately is that eating more often during the day prevents blood sugar spikes and makes you feel full, even if you're consuming fewer calories. Go for five or six eating sessions a day rather than the usual three.

Plan ahead. Take time on the weekend to plan your menu—breakfasts, lunches and dinners—and do as much of your shopping and prep work in advance as you can. Being prepared makes it easy to stick to your healthy diet plan.

Try more beans. Americans eat almost 200 pounds of meat, poultry and fish a year, way more than anyone else in the world. Cut your meat intake (and therefore your fat intake) by using beans instead of meat at least one meal a week. Beans are rich in fiber and can help lower cholesterol.

Look for ways to add veggies. It's easy to add vegetables to salads, pasta sauces and rice dishes in addition to just eating them as sides. Each meal, think about ways to add a vegetable, and if you can, do it.
Eating healthy becomes second nature after a while. Once you've lived with your healthy eating plan for a few weeks you won't even miss the unhealthy junk you were eating before.