Understanding Body Fat Percentage vs BMI
Views on what constitutes a healthy body fat percentage vs. BMI are changing. It is more complicated than just a number because BMI’s limitations make it difficult to gauge what is considered a healthy weight and fat distribution.
The reality is that body fat percentage and Body mass index (BMI) measure two very different things.
What BMI measures
BMI is a numerical value calculated from your height and weight, not your body composition. It groups individuals as underweight, overweight, or obese.
The categories are used to assess possible health risks across a wide swath of the population.
Finding your BMI
It is determined by dividing your weight in kilograms by the square of your height in meters.
What it actually measures
It measures your weight-to-height ratio, indicating how much body mass you have relative to your height.
From this, doctors have developed correlations with certain diseases, such as Type 2 diabetes or cardiovascular disease.
Body fat percentage vs. BMI
The issue is that most people assume a high BMI means you also have a high body fat percentage. This isn’t necessarily true.
What body fat percentage indicates
Body fat percentage actually explains your body composition. It determines your total fat mass divided by your total body mass.
It measures the difference between your lean mass, which is muscle, bone, water, and organs, vs. your total fat composition.
Your body is made up of two kinds of fat: essential fat and storage fat.
Essential fat is the minimum amount of fat your body needs to protect your internal organs, regulate your hormones, and provide the energy required to function.
Men need roughly 2-5% essential fat, while women need 10-13% to support reproductive needs.
Storage fat is the excess fat stored in your adipose tissue. Subcutaneous fat is found directly under the skin, and Visceral fat is located deep in the abdominal cavity around your organs. This is the fat associated with health risks.
Key differences and limitations
BMI limitations stem from the fact that it is simply a general ratio, and it can be misleading because it doesn’t account for muscle mass.
Muscle is denser than fat. For instance, a bodybuilder can fall into the obese category by BMI standards, yet have very low body fat.
On the flip side, an adult might have a healthy BMI but low muscle mass and high visceral fat. This is common among older adults as they lose muscle mass with age.
The key limitation is fat distribution. BMI doesn’t measure where your fat is stored, especially visceral fat, which is most strongly linked to health risks.
Key differences
Body fat percentage vs. BMI:
- BMI is measured by height and weight. It doesn’t distinguish between muscle, bone, and fat, and it has a high error rate.
- Body fat percentage is measured as the ratio of fat mass to total body mass. It accurately identifies fat tissue. It is more accurate than BMI for assessing physical fitness, but it requires specialized tools to obtain a reading.
Which matters more for body contouring?
Your body fat percentage and the location of your fat are significantly more important than your BMI, but BMI is a good place to start when determining whether you are a good candidate for body contouring.
Scores under 30 are ideal for using LightRx’s Venus Bliss instead of a weight-loss program. If your BMI is too high, it may indicate that your fat layer is too thick, and the radiofrequency won’t be able to penetrate effectively for body contouring until you lose some weight.
Where it really matters: Stubborn fat is where body contouring shines. The Venus Bliss system is designed for subcutaneous (pinchable) fat.
A LightRx technician will use a physical assessment rather than actual numbers to determine your treatment protocol. Also, if your BMI is low but your body fat percentage is high enough to cause loose skin, skin tightening may be chosen over body contouring.
This is why our consultations matter in designing the best treatment plan for your specific needs.
Setting realistic body goals
For treatments at LightRx, you should focus on body contouring. Your goal should be the reduction of fat in stubborn areas, like the lower abdomen, hips, and thighs.
Remember that your weight fluctuates daily due to hydration and inflammation, so a 3-5 lb. range is normal. If you want to lose body weight, aim for a fat loss of 1% of your body weight per week to avoid losing muscle mass.
Ultimately, the most important goal is how you feel and how your clothes fit, rather than a calculation that doesn’t account for muscle and fat when determining body composition.
LightRx has the tools you need to achieve the look you want. Schedule a free consultation today to design a program that best fits your goals.
