From an aesthetic point of view, the ideal weight obviously does not exist. However, with regard to health, it would be wise to fall within a weight range, an indicator of ideal weight. Of course, this weight (normative figures) calls for some adjustments. How to calculate this ideal weight? How to reach it and keep it?
Calculation of theoretical weight with Body Mass Index
Many doctors have tried to develop mathematical formulas to determine the threshold of obesity, to be considered with caution, especially if you have heavy bones and / or if you are very muscular. However, health authorities are using the calculator below to determine the ideal weight range to fall into to stay healthy.
Body mass index (BMI)
BMI = weight / height squared
(For example: BMI = 55 / (1.65 x 1.65) = 20.2 if you weigh 55 kilos and measure 1m65)
The table below below is valid for adults.
- Less than 18.5 => Skinny
- From 18.5 to 25 => Normal
- From 25 to 30 => Overweight
- Over 30 => Obesity
By reversing the formula, we can give an approximation of the ideal weight for a given height: ideal weight = BMI x height squared.
For example, to get a BMI between 18.5 and 25 when you measure 1m60, you must weigh between 47.5 kg and 64 kg.
To know your exact weight, automatically calculate your BMI and have real-time information on your body composition, it is best to opt for a balance impedance meter.
Calculation of ideal weight with Lorentz’s formula
The Lorentz formula
- Ideal weight for a woman = height in cm – 100 – (size -150) / 2
(For example, if you are 1m 65, your ideal weight = 165 – 100 – (165 – 150) / 2 = 57.5 kilos).
- Ideal weight taking into account age = 50 + (height – 150) / 4 + (age -20) / 4
(For example, if you are 1m 65 and are 30 years old, your ideal weight = 50 + (165-150) / 4 + (30 – 20) / 4 = 56.5 kilos).
The limits of these methods
Warning: The Lorentz formula is hardly used any more. As for the BMI, it only gives an approximate idea of the desirable weight, insofar as it does not take into account the age of the individual, nor his skeleton, nor his morphology.
Weight, fat and lean mass, what to understand
The weight displayed on the scale covers the sum of the various elements that make up the body, without taking into account their respective proportions.
Thus, the overall weight of a 25-year-old person is distributed as follows: 25% fluid (blood and water), 32% muscles, 15% skin and skeleton, 8% viscera and organs, 20% fat
Certainly , weighing oneself is already a good indicator, but the muscle weighing more than the fat, an athlete can quite display a relatively high weight without having to lose weight.
To measure the composition of the body (rate of fat mass vs rate of dry mass, that is to say of muscle mass), there is a test: bioelectrical impedancemetry , which consists of placing electrodes on the body. By determining the fat mass and the lean mass, impedancemetry gives a more in-depth idea of the goal and the weight that we can hope to achieve.
Bioelectric impedancemetry is a technique that still costs a bit expensive, and whose most advanced equipment is very often that of professionals.
Fitness weight, balance weight
Many specialists prefer to speak of a healthy weight or a balanced weight. This figure, reached in adulthood, differs between individuals depending on the history (growth, weight development, state of health) and heredity of each, and may change over the course of life depending on certain settings.
The body would thus always tend to come back to this balancing weight, programmed in advance and unfortunately not always in tune with the desires of each other…
The success of a suitable and stable weight
- The scale figure is not the only indicator of ideal weight : it can also vary from day to day, depending on what we have eaten or drunk. As such, it is preferable to weigh yourself only once a week, at the same time and in the same outfit.
It is better to speak of a balanced weight , that which is “attributed” to us by nature, according to genetics, morphology (size, bones, etc.) and experience. It is generally a weight which, whatever one does (excess or diets), tends to return regularly.
- Rather than trying to reach a weight that is not suited to your morphology and lifestyle, it is better to try to maintain this healthy weight by eating in a varied and balanced way, and by regularly practicing physical activity.
- If, on the other hand, we are aware of having strayed too far from this equilibrium weight (thinness or overweight), we can refer to the body mass index and / or, for more detailed figures, to a test. impedancemetry.
Afterwards, it is recommended to consult a nutritionist or a dietitian in order to carry out a food assessment and make the necessary corrections according to your body, health, food preferences, lifestyle …
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