Is BMI really an accurate indicator of health?!

Body Mass Index Also known as BMI, it's a standard health assessment tool available in most healthcare settings. Even though this index is used to measure health based on body size, it’s been widely criticized for oversimplifying what good health really means.

Actually, many believe BMI is outdated and inaccurate and shouldn’t be used in medical or fitness settings. In this article, you’ll learn everything you need to know about BMI, its history, whether it’s an accurate health measure, and some alternatives.

• First: What is BMI?

BMI is a measure developed by a Belgian mathematician to quickly estimate overweight and obesity levels in a population. It uses a specific formula to decide if someone has a healthy weight.

BMI is calculated by dividing weight in kilograms by height in meters squared. Once calculated, your BMI is compared to reference values to see if it falls within a normal weight range or not, as follows:

According to this calculation, a healthcare professional may suggest health and lifestyle changes if your results aren't in the normal weight range.

Even though this gives a quick idea of health based on weight, it doesn't consider other factors like age, gender, race, genetics, fat mass, muscle mass, or bone density.

• Second:- Is BMI a measure of overall health?:-

Though there's concern BMI doesn't accurately show if someone is healthy, most studies show people with chronic diseases and early death risk if their BMI is under 18.5 or over 30.0.

Studies show that people with BMI in the obese range have up to a 20% higher risk of death from heart disease compared to those with BMI in the normal range.

Studies also show that BMI over 30.0 raises risks for chronic health problems like :-

• Type 2 diabetes.

• Heart diseases.

• Difficulty breathing.

• Kidney diseases.

• Fatty liver disease.

• Mobility issues.

Lower BMI is linked to lower rates of metabolic syndrome, heart disease, and type 2 diabetes. Still, BMI shouldn't be the only tool health providers use or the only way you judge your overall health.

• Third:- Downsides of BMI:-

1. Doesn’t consider other health factors:-

BMI just answers yes or no about if someone's weight is normal, without explaining anything about age, gender, genetics, lifestyle, medical history, or other factors.

So relying only on BMI can miss other important health measures like cholesterol, blood sugar, heart rate, blood pressure, and inflammation levels.

Even though men and women have very different body makeup, with men having more muscle and less fat than women, BMI uses the same calculations for both.

2. It assumes all weight is equal :-

Even though 1 kg of muscle weighs the same as 1 kg of fat, muscle is denser and takes up less space. So someone can look very slim but have a high weight because of their muscle mass.

If BMI alone is used, it can easily label someone as overweight or obese, even if they have low fat mass.

So it's important to consider muscle, fat, and bone mass along with weight.

3. It doesn't consider fat distribution :-

While a higher BMI links to worse health outcomes, where fat is stored in the body makes a big difference. People with fat around their belly or apple-shaped bodies are more prone to chronic diseases than those with fat around hips, butt, or thighs, who have pear-shaped bodies.

Actually, BMI doesn't take into account where fat is stored in the body, so it might wrongly label someone as unhealthy or at risk of disease.

4. It might be biased toward weight:

Usually, healthcare providers use their best judgment, meaning they consider the BMI result along with many other factors to assess the person.

However, some health pros just use BMI to check health before making any medical recommendations, which can lead to bias toward just weight and lower quality care.

• Fourth: Better alternatives to BMI:

Despite BMI's many flaws, it’s still used as a first-step tool because it’s convenient, cheap, and easy to get in any healthcare setting.

But there are better alternatives to BMI for health, though each one has its own pros and cons.

1. Waist circumference measurement:

A larger waist circumference over 85 cm for women shows more belly fat, which links to higher risk of chronic diseases.

2. Waist to hip ratio :-

A high ratio over 0.80 in women means more fat stored around the stomach, which links to more chronic disease risk. A low ratio at or below 0.80 means more fat stored at the hips, which links to better health.

3. Body fat percentage :-

Body fat percentage is the total portion of fat in your body. This helps tell fat mass from fat-free mass. It's a more accurate health risk measure than BMI.

4. Laboratory tests :-

Lab tests are different blood measurements and vital signs that relate to risk of chronic diseases like blood pressure, cholesterol, and heart rate.

So even though BMI can be a quick health indicator, don't make it your only measure of health.