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Published on December 08, 2016 by Contributing Author
The mere mention of body fat conjures images of overweight, beer-bellied men or women with their jelly bellies and thunder thighs.
This is why you’ll find thousands of articles about losing body fat, or magazines loaded with front cover headlines that promise to get rid of x amount of body fat in x days.
But what if it’s not that simple? What if there’s more to body fat than just burning it?
Body fat is something everyone has an opinion on, but is not always clearly understood. As it turns out, there’s more to this conversation than just “X steps to lose body fat.” Your body requires some to be healthy, but it also requires you to keep those levels in check.
Let’s get to it.
What is Body Fat?
It seems like an obvious question: what is body fat? You're probably thinking that it's "the fat you can see and point at." Yes, that's true - but that's only half the picture.
Body fat can be broken down into smaller components, and to have a better understanding of how to manage your body fat, you first need to know how to talk about it.
Essential Fat vs. Storage Fat
The first thing to understand is that just as food laden in fat doesn’t automatically make you fat because not all dietary fats are created equal, the same goes for body fat.
First off, there’s essential body fat. It plays a significant role in your overall health and as its name implies, it is essential for survival.
Present in organs, bone marrow, nerve cells, and the brain, your essential body fat helps you:
- Have sufficient energy reserves by acting as a metabolic fuel
- Conserve body heat by acting as an insulator
- Protect your internal organs and joints by acting as soft, fluffy cushion
- Reproduce; body fat and fertility are heavily linked to each other
Normal essential fat values are pegged at 3 percent and 8 to 12 percent for men and women, respectively. The higher fat ranges in women account for female-specific fat needs due to childbearing and similar reproductive functions.
Meanwhile, nonessential or storage fat is fat that accumulates as energy reserves.
While there’s no official standard for acceptable body fat values, the ranges 10-20 percent for males and 18-28 percent for women are good ranges to set goals around. These are slightly less forgiving than those set by the American College of Sports Medicine (ACSM) - which acknowledges a range of 10-22 percent in men and 20-32 percent in women - because they’re centered around an average PBF of 15% for men and 23% for women.
If you’re figuring out the right body composition goal specific to you, these ranges are excellent starting points. It’s worth noting that body fat percentages should not be confused with BMI (body mass index) values.
Subcutaneous vs. Visceral Fat
Going one level further beyond essential and storage fat is the fact that storage fat itself can be further divided into two: subcutaneous and visceral.
Although they’re both components of storage fat, they’re quite different from each other. So different in fact, that these two types of fat have different gene expressions. This means they are literally different and function independently from each other.
Deposited underneath the skin, subcutaneous fat is fat that you can see, touch, and pinch. Because it’s visible and impacts body shape, this is the type of fat that typically motivates men and women to improve their body compositions.
This is also the type of fat pinched with skinfold calipers to determine body composition.
The skinfold test via fat calipers was once considered the standard in obtaining a general estimate of the amount of subcutaneous fat you have in the body. However, the usefulness of using body fat calipers has been called into question because, among other concerns, they aren’t able to accurately account for or report the second, more dangerous type of body fat.
This, of course, is visceral fat. It is invisible to the eye and comfortably snugs itself between your abdominal organs. Visceral fat is recognized as a worse health threat than subcutaneous fat. In fact, it’s considered a strong, independent predictor of all-cause mortality in men.
And then there’s metabolic obesity.
It happens when individuals have too much visceral fat (regardless of whether you’re lean or obese), increasing their risk for developing conditions like cardiovascular disease.
The mechanism behind visceral fat’s role as a health threat is largely attributed to the following:
Visceral fat used to be to thought of as an inert (inactive) tissue. However, it turns out that it’s a secretory (active) organ, capable of pumping out proteins just like your liver does, or your pancreas.
Again: visceral fat doesn’t just sit there. It’s active, and it contributes to poor health.
The proteins visceral fat produces are called cytokines, and they’re one of your immune system’s “foot soldiers.”Excess visceral fat pumps out much more of these cytokines than you need. Just like you wouldn’t want soldiers always patrolling your neighborhood, you don’t want more cytokines in your body triggering inflammation and putting unnecessary stress on your healthy organs.
Visceral fat’s location near the portal vein (the vein that blood from the stomach, pancreas, and spleen uses to travel to to the liver) triggers the release of inflammatory cytokines that can potentially find their way to the liver too. As a result, these stealthy cytokines will influence lipid production in the liver and cause a ruckus in the form of insulin resistance and steatosis (fatty liver).
What causes too much visceral fat?
Genetics may influence how you store fat in the body. Hereditary influences aside, the following are a few factors have been shown to increase your likelihood of increasing visceral fat accumulation:
- Excessive alcohol consumption
- Sleep deprivation
- Inadequate aerobic (cardio) activity. This systematic review of previous studies on the subject found out that aerobic training of moderate or high intensity has the highest potential to reduce visceral fat among overweight individuals.
How You Gain Body Fat
So how do you gain and store body fat?
First off, let’s take a closer look at the evolutionary origins of obesity.
In The Scientific American, psychologist and science writer Jesse Bering described how storing fat helped our ancestors survive food shortages. However, it wasn’t until the Industrial age (which led to the industrialization of the food industry too) where societies or environments that tend to promote obesity began to take shape.
With no food shortages to worry about and an increasingly sedentary lifestyle, fat stored by the body isn’t put into good use anymore. In short, excess fat just kept on piling up.
This detailed look on the origins of obesity also supports the idea that storing too much body fat and obesity is not primarily the result of one’s “internal biology” but rather how you respond to your “external environment,” which in many parts of the modern world, is characterized by an abundance of convenience and little need for exercise.
Put simply: How hard is it to find high-calorie foods? How much exercise is required to acquire it? On the other hand, how many of us have chronic stress from the hustle and bustle of daily life? Your response to the convenience as well as the stresses of the modern world has an enormous impact on your risk of gaining excess body fat and obesity.
Fortunately, you still have some control over how you respond by making choices regarding your diet and lifestyle.
What if you have a "slow" metabolism?
It’s a common assumption that individuals with a supposedly “slow” metabolism gain body fat quickly.
While there is indeed a connection between metabolism and body composition, you don’t gain body fat because you’re a slow burner. As mentioned earlier, genetic influences may be at play in how your body stores fat, yet it’s the caloric imbalance over time that’s often responsible for your love handles and spare tires.
Overall, your metabolism doesn’t slow down because you’re getting older and have consumed more birthday cakes in your life. Rather, it’s largely due to two things that tend to happen as you age, but not because of it - a loss of muscle and a tendency towards a sedentary lifestyle.
This is good news for you because unlike the aging process - which is irreversible - you do have some control over both your muscle loss and your lifestyle habits.
Remember how as a kid, you spent a lot of time running around at school? Walking from class to class or from home to a friend’s house (or anywhere before you could drive, for that matter) - when you’re younger, you were always moving.
Fast forward to today, you’re now the Employee of the Year who rarely gets out of the office chair, drives to/from work, goes home and sits some more, but you’re still eating like you’re in your teens and twenties. You get the picture: You move less, but your eating habits often remain the same.
Combine this with muscle loss due to inactivity, which lowers your metabolism, and you’re on a surefire path to gain body fat as you age - but because of your lifestyle, not your age.
How You Lose Body Fat
So how do you battle the extra bulge?
This is one of those things in life where you’re already aware of the (sometimes painful) truth but your mind still wants to believe in a comforting lie, like blaming your weight gain on slow metabolism.
Eat less. Move more. Right? No crazy crash diets, no insane workouts, and no “weird tricks.”
But we can all agree that it’s not as simple as it sounds.
Nevertheless, you have to take it one (actionable) step after the other if you want to become a better version of yourself and improve your health.
What it Means to Eat Less
While calorie counting may have its own set of controversies, the evidence supports that generally speaking, aiming to be in a caloric deficit simply works. It’s the basis of nearly every responsible and effective fat loss dietary plan.
However, eating less (get ready, this is important) doesn’t mean starving yourself.
Simply axing hundreds of calories out of your diet all at once, without considering what you’re cutting and why, will make eating less extremely difficult to maintain in the long run. Being more mindful of the quality of calories and macronutrients that you eat is absolutely essential.
Why? For far too many reasons to get into here, but for one salient point, consider the difference between a cup of white rice vs. a cup of brown rice.
Rice vs. Rice
Most people will agree that brown rice is “healthier” than white, just as most people judge brown bread to be better than white. However, according to the US Department of Agriculture, the caloric difference between a cup of white rice and brown rice is effectively nil; if anything, the “healthy” brown rice actually has more calories than the white rice.
“Ha!” you say. “If all that matters is calories and being in a caloric deficit to lose body fat, then by your own logic, shouldn’t I be eating white rice?”
Not quite. White rice has been processed, meaning it takes less time and energy for your body to digest and absorb it, which results in the majority of calories contained in white rice becoming available for your body to either use or store as fat.
Brown rice, by comparison, requires more energy to digest, and although on paper it has more slightly more calories than white rice, you actually absorb less energy from brown rice, and if calories/fat loss is a concern, this is a good thing. Research suggests that processed foods, like white rice, can be a factor in weight gain.
Secondly, because processed white rice is easier for the body to absorb, it causes blood sugar levels to spike, and then drop dramatically.
In some people, low blood sugar can trigger a series of events in your body that results in your body sending you signals to eat more food - to correct the low blood sugar levels - which, from an energy standpoint, you don’t actually need. This doesn’t happen with unrefined/unprocessed grains like brown rice, which have a much slower and more controlled effect on your blood sugar levels.
All this is to say: processed foods might have less calories than whole foods, yes, but processed foods don’t make you feel as full for as long, leading you to take in more calories even if your body doesn’t need them. And, as we’ve already seen, taking in more calories than you need causes you to gain body fat.
This is just one example, but it serves to show how, even when the caloric content of food is near identical, quality matters. Higher quality food can make you feel fuller for longer, making it much easier to control your diet. Lower quality food can trigger overeating, and ultimately, fat gain.
What It Means to Move More
Abs are supposedly made in the kitchen, right?
This phrase is designed to educate people that they can work out as much as they want, but without proper nutrition, much of the hard work put in to lose fat will go to waste. There’s a lot of research that backs this up.
A meta analysis on the relationship between fat mass and physical activity on children concluded that being active alone doesn't necessarily result in weight loss. Another study concluded the same thing, this time among adults.
So should you ditch your gym membership and hang out more in the kitchen instead?
Not so fast.
Exercise has a ton of benefits in addition to preventing fat gain. For starters, it helps you sleep better. And as mentioned earlier, getting quality sleep regularly is linked to reduced visceral fat levels. Healthy habits often work together like that.
Furthermore, another meta-analysis on diet and exercise programs for weight loss found out that combining diet and physical activity is more effective for weight loss over 12 months than interventions based on diet or physical activity alone.
And if you want to do something specific to fight visceral fat, the findings of this study suggest that physical activity is more likely to work against visceral fat if you favor cardio (aerobic) over other forms of exercises. This systematic review on the subject nods in agreement too.
So what type of cardio works best against visceral fat?
HIIT (high-intensity interval training), like what’s done in most CrossFit programs, is your best bet. This study revealed that 3 sessions of HIIT (20 minutes per session) for 12 weeks resulted in a 17 percent reduction in visceral fat. Furthermore, two weeks of high-intensity aerobic interval training has been shown to increase a woman’s capacity for fat oxidation.
So Are You Really Losing Fat?
How do you know that you’re on the right track to lose body fat?
Monitoring the scale? Not really.
Changes in body weight aren’t exactly an accurate reflection of your progress. A pound of fat weighs the same as a pound of muscle or water in your body.
On the other hand, most body composition analyzers can figure out your lean body mass and fat mass at the same time, but many lump all types of fat into one “fat mass component” ignoring the distinction between visceral and other types of fat.
The Bottom Line
There’s a lot to know about body fat. The interplay between nutrition, dietary strategies, exercise regimens...it’s enough to make anyone’s head spin. Plus, once you factor in the role of genetics and environment on obesity, losing body fat can seem like an overwhelming challenge that you’re powerless to achieve on your own.
That shouldn’t be the message you take away here. Knowledge is power, but it shouldn’t over-complicate the challenge at hand. The reality is, for the vast majority of people, fat loss is something you can have a significant degree of control over by finding a diet and exercise regimen that helps you control their levels and fits naturally into your current lifestyle.
It’s true, the battle against body fat goes beyond the fat that you can see, and it goes beyond what a scale can measure. Surface level skin fat only tells half the story of risks associated with excess body fat. If you rely on appearances only, you may be putting yourself unknowingly at risk. Visceral fat can be lurking inside of you, wreaking havoc on your body.
Ultimately, researching methods and devices that accurately measure body fat is a good start. It will make you more confident that you’re heading towards the right direction, and not just blindly following programs that promise you’ll lose x amount of body fat in x days.Tagged: Body Composition › Health/Fitness › Nutrition ›