Why you must control your weight?

Being overweight can impact on cholesterol and blood sugar levels increasing the risk of cardiovascular disease and diabetes.

What is the normal weight of a person?

The normal weight of a person is determined by the Body Mass Index (BMI). This method is widely used by doctors all over the world.

How to calculate the BMI?

The BMI is calculated by dividing the weight in kilograms by the height in metres squared:

    Weight (in kg)
BMI =   ---------------------
    Height2(in metres)

How to evaluate the BMI?

The result of the above depicted formula gives you the value of the BMI and its evaluation is the following:

BMI evaluation
Between 18.5 & 24.9 Normal weight
Between 25 & 29.9 Slightly overweight
Between 30 & 40 Overweight.
Moderate cardiac risk.
More than 40 Obese.
High cardiac risk.
        90kg       90kg      
BMI   =   ---------------------   =   ---------------------   = 31.14
        1.7m x 1.7m       2.87      

Suppose a person was 1.70 m high and weighed 90 kg. Her BMI would be:

According to the table above, this result shows the person to be overweight with a moderate cardiac risk.

If the BMI is enough to control your weight?

The BMI, even if it is a useful tool to control your weight, it cannot predict the body composition of the person, but can offer a closer approach of their health status. Sometimes a person can lose weight, reducing the BMI but increasing the % of body fat. The calculation of the BMI together with the body composition will give a better approach of the health status of that person.

What is the body fat index and how it is estimated?

By means of the Bioelectrical Impedance Analysis (BIA). This technique is based on the fact that non fat human tissues contain water and therefore are good conductors of electricity. The fat tissues contain less water and conduct less electricity. We send a low energy and high frequency electrical current (50 Khz, 500 microampers) from one contact of the Health Kiosk unit going through the body of the user and we measure the loss of voltage (impedance) when arriving at the other contact. We know that there is a direct relationship between the impedance and the volume of the conductor, so we can estimate the amount of water in the body, of the non fat mass and finally of the body fat. The estimation of the body fat percentage is the result of applying several formulae combining the impedance with the weight and height as well as the indication of age and gender of the user.

How to optimize the BIA?

To get the most accurate result when calculating the body fat percentage, it is advised to comply the following conditions:

It must be taken into account that the hydration of the user may be affected if he suffers from a disease, and therefore affect the result of the measurement.

In general, the value of the impedance increases when the user suffers from dehydration. Note also that when a person increases their weight after ingesting a lot of liquid, the impedance will decrease. The water and the electrolytes present in the human body act as conductors of a low current passing through the body. If this passage suffers any alteration, it will be reflected as variations of the impedance.

Which elements affect the BIA?

The observation of the conditions above is the only way to ensure an accurate result of the BIA, and that it will not be affected by the changes in the level of hydration of the person.

In normal conditions, the total amount of water in the body is 55-65% of their total weight, according to the physical condition of the person, their sex and their level of hydration. The BIA measuring method does not measure the percentage of water in the body, but this percentage affects the impedance and therefore the percentage of body fat can be determined.

What variations can suffer the BIA?

Why has the body fat increased when losing weight

When dieting the amount of calories is reduced, the human body tends to consume the calories accumulated in the muscles since the ones brought by the food are not enough. The result is a loss of muscular mass and of water, but not of fat mass. Therefore the percentage of body fat in respect of the total mass will increase. When this happens, the doctor will correct the habits of the patient so that the loss of mass is in the same proportion for all kinds of tissues. On top of the correct diet, he will surely recommend the patient to increase their physical exercise to stimulate the muscles and also to control the level of hydration. A periodical measurement of the body fat will help to minimise this effect.

The human body takes some time to get used to a new diet, so it is advisable to take a 2-3 week control period before confirming if there is a loss of muscular mass and/or hydration, as well as whether the fat mass decreases or not, before making any changes in the programmed diet.

How to evaluate the % of body fat?

The Health Kiosk not only measure the weight, height and blood pressure of the user but can also calculate the body mass index and estimate the body fat of the user. The references on the ticket will determine if any course of action is necessary.

If the measurements are made under the same circumstances (similar clothes, same time of the day, etc.) the evolution of the results will allow you to take the best decisions for your wellbeing.

Normal Body Fat Index
Age 20 to 29 30 to 69
Male 14% to 20 % 17% to 23 %
Female 17% to 24 % 20% to 27 %

The importance of the blood pressure?

Blood pressure is considered a good indicator of the condition of the cardiovascular system, because it is one of the physiological variables that can be measured with great convenience. A clinical history of the blood pressure readings has saved many people from a premature death by warning of hypertension with enough anticipation to carry out a treatment. The blood pressure is measured by two parameters:

What is hypertension?

Hypertension is a disease that has become more relevant in recent years, especially since statistics have proved the dramatic consequences of a continuous rise in blood pressure.

The measurement of the blood pressure is an extremely important element in the prevention and control of the hypertension.

A person is considered to suffer from hypertension when their blood pressure readings go over the limit of the normal values. Here are the recommended values and hypertension levels according to the World Health Organization:

Classification of hypertension by blood pressure level in adults
Category Systolic blood pressure (mmHg) Diastolic blood pressure (mmHg)
Optimal less than 120 less than 80
Normal less than 130 less than 85
High-normal between 130 and 139 between 85 and 89
Hypertension grade 1 (mild) between 140 and 159 between 90 and 99
Hypertension grade 2 (moderate) between 160 and 179 between 100 and 109
Hypertension grade 3 (severe) more than 180 more than 110

What are the hypertension factors?

Other: Other elements that have been related to hypertension are the stress, the kind of life, the kind of job, the professional status, the geographic altitude, the high consumption of alcohol, the composition of the water consumed daily, the noise in your environment, and some hereditary factors.