Fat Loss Biology

Lose Fat – But Which Fat?

Belly Fat Loss

The smart goal is to lose fat, not just weight. The question is, what fat? Is there really bad body fat that is different from good body fat? Absolutely, and here is what you should know about each one.

Good Body Fat vs. Bad Body Fat

Body weight and body fat are general terms. Both are easy to measure. You can quickly find out your weight on an ordinary scale. You can just as quickly find out our body fat percent on the same scale if it has a bioelectric impedance device inside. Or you can measure total body fat percent with a handheld device. Neither of these physical measures is consistently valuable in predicting health outcomes. We simply measure them because they are easy to measure.

This doesn’t stop weight loss gurus from breathlessly pointing to body weight and body fat as if they are the end-all and be-all of health. Sometimes they even cite other numbers that are supposedly useful, such as Body Mass Index (BMI), which is based on weight and height.

What body weight, body fat percent, and BMI fail to consider is total body composition, which means the components of lean body mass as well as the components of fat mass. It’s not too complicated to distinguish between muscle mass and bone mass, although you won’t be able to do it at home. The bigger challenge, though, is to keep track of the most important of the three kinds of body fat. Doing so is the easiest and most meaningful way that you can track your metabolic health when it comes to fat metabolism.

Subcutaneous Fat

Subcutaneous fat comprises about 80 percent of your body fat. This is what appears around women’s butts and thighs and gives them a womanly figure. (Sorry, ladies – that is where you are supposed to have plenty of fat.) Men have it, too, just not as much. Subcutaneous fat correlates with longevity. That’s right … the more you have, up to a limit, the longer you are likely to live. This is a good fat.

Brown Fat

Brown fat (aka, brown adipose tissue or BAT) is also a good fat. It is especially abundant in newborns (‘baby fat’). The amount of BAT diminishes so drastically as we grow into adulthood that not too long ago the medical folks believed that, after growing up, we didn’t have any left at all. Now we know that most of us have a little deposit of it around our upper chest and neck. Obese people have less than the non-obese. We also know that BAT is loaded with mitochondria (brown from the iron in them) and that it gets energy from storage fat. It is fat that directs the burning of fat. You can bet your bottom dollar that drug companies are working around the clock to discover ways to increase the activities of BAT. (All you really have to do, though, is ice down the back of your neck or lay shirtless in some snow or in an ice tub to really get BAT going. No fuss, no muss, no drugs. Just teeth-chattering cold.)

Visceral Fat

Visceral fat (aka, abdominal or belly fat) is the evil one. This is the fat that appears inside your abdomen, where it doesn’t belong. It is also the fat that accumulates in your liver, which is a huge no-no for your health. As the abundance of visceral fat rises, so does the size of your waistline.

Isn’t it convenient that visceral fat is what causes your belly to protrude? This just means that the best way to keep track of visceral fat is simply by measuring your waist. No fancy equipment or blood test needed. The more your waist shrinks, the better off you are.

What a simple concept!

All the best for losing belly fat,

Dr. D

2 Comments so far »

  1. by Carol


    Please expand on the brown fat information and cold ” therapy”


  2. by Dr. Dennis Clark


    Hi, Carol:

    There still isn’t a good study that offers practical strategies. It seems, though, that a LOT of exposure to cold might be required to accomplish anything significant. Brr!

    All the best,

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