BMI (Body Mass Index)
The BMI represents one’s proportional weight. Absolute weight on the weighing scale or just considering weight for age standards, can be misleading as it does not take into account one’s height and therefore proportionality and distribution of body weight.
The figure below shows how to calculate BMI, and the definition of underweight, overweight and obese according to BMI calculation.
Our heart works tirelessly and quietly round the clock, so evidently if it gets ill in any way, the health impact can be serious and significant. Even though the heart chambers are filled with blood, it requires blood vessels (called coronary arteries) to supply blood and oxygen to its muscles (myocardium) which pump the blood to the entire body.
It is important to note that the BMI does not tell you whether the body weight is due to excess fat or muscle mass. So, though BMI may be a fair indicator for most adults of average height, it can be interpreted falsely in people who are very tall or athletic. People engaged in sports training and body building can have a high BMI attributed to increased muscle mass (protein) and not fat, therefore they do not carry any of the health risks or concerns that an overweight or obese person does.
BMI values in children are interpreted based on charts with the 5th and 85th being the for underweight and overweight cut offs.
Being either underweight or obese increases the risk of mortality from many diseases.
Fat distribution – Subcutaneous and Visceral Fat
A very valuable indicator that complements the BMI value is assessing the fat distribution in the body. Fat deposits in our body can be subcutaneous (that is under the skin) or visceral (around internal organs). Subcutaneous fat is what one can pinch with the hand, and is not considered a high health risk. However visceral fat, seen mainly as what is also called abdominal/belly fat which is around the mid region of the body (waist and stomach area) is of concern and associated with increased health risks.
Belly fat or abdominal is attributed to body fats (lipids: cholesterol and triglycerides), as well as to sedentary lifestyle and inappropriate diet, and is studied to stimulate the release of inflammatory mediators contributing to cardiovascular disease (CVD) and other chronic diseases.
A simple way to differentiate if the fat in your abdomen is subcutaneous or visceral is to lie down flat, and see if the abdomen flattens (subcutaneous fat) or not (visceral fat). The shape of the abdomen being like a ‘pear’ or ‘apple’ can also indicate subcutaneous or visceral fat respectively, but this assessment may be subjective and less reliable. Fat around the thigh, hips and buttocks which is common in most women, is not associated with increased health risk, unlike what was thought previously.
The waist circumference (WC) can also be a complimentary guide to BMI to assess obesity and health concerns. Increased obesity-related health risks are associated with a WC ≥ 94 cm in men and 80 cm in women. However substantially increased health risk with increased BMI is considered in a man with WC ≥102 cm, and women with WC ≥ 88 cm.
For adults who have a BMI in the range of 25-35kg/m2, the WC and the BMI along with visible fat distribution should be correlated with other health parameters like blood pressure (BP), blood lipids (LDL cholesterol and triglycerides) and diet/lifestyle to determine the overall health risks especially of hypertension, diabetes type II and CVD.
Defining categories of Overweight and Obesity by BMI, and Waist Circumference
High BMI and Obesity can increase the risk of developing health problems given below:
In addition, presence of obesity can be a poor prognosis factor (increase the complication and mortality rate, or delay recovery) in certain conditions like Asthma, Chronic Obstructive Pulmonary Disease (COPD) and also COVID-19 (Coronavirus disease).
A 5% or more maintained weight reduction can improve a patient’s cardiovascular risk profile, lower risk of diabetes, reduce risk of bone problems (osteoarthritis and osteoporosis), and improve quality of life. However, larger weight loss (>10%) may be needed in patients with obesity and sleep apnea, or lung problems like chronic bronchitis and asthma.
Ideal or Target values of Parameters to minimize Health Risks
The two most important steps for reaching and maintaining target BMI and optimal health are an appropriately nutritious diet, and regular physical activity or exercise. The guide below can be used to design a healthy diet for oneself and family. However, if obesity or cardiovascular risk factors are present, additional restrictions in both total amount of food intake and calories as well as types of food items to select or avoid may be given by the nutritionist or physician.
People who are overweight and tending to obesity, or those already in the obese category should follow a structured weight loss and physical exercise program under expert guidance.
(Note ‘cup’ refers to any utensil which accommodates around 240-250ml of water;
1 tablespoon =15ml=3 teaspoons).
*Oils and Fats (Lipids) can be of various types as shown below. Therefore, it is important to take care and select the food items you eat based on what types of lipids are present in them.
Daily half hour to 45 minutes (90-150 minutes/week) of physical exercise is advocated to maintain BMI as well as general health, wellness and fitness. These exercises can include brisk walking, jogging, aerobics, yoga, swimming, cycling or playing a sport.
People with health conditions like cardiovascular disease, respiratory conditions like asthma and COPD, or bone-joint problems like arthritis and spondylitis, should consult their physician before starting on any new, or strenuous exercise regime. Sudden intense exercise or bouts can cause more damage than benefit, therefore a warm-up and cool-down period should be included, with duration and intensity of exercise scaled up gradually over a few days.
Regular Medical Check-up
People who are overweight and tending to obesity, or those already in the obese category should have regular medical check-up especially after the age of 40 years.
A general physical examination, weight and blood pressure measurement, along with blood parameters like complete blood counts (CBC), blood sugar and lipids (cholesterol and triglycerides), kidney and liver function tests, and in some cases ECG and urine test, are usually the tests evaluated part of a regular/routine medical check.
An annual medical check-up is adequate if there are no associated cardiac conditions or risk factors. However more frequent check-up may be recommended if any health parameters are abnormal, if you are on medications, or you have other risk factors to develop any of the conditions related to obesity mentioned.
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