What Really Matters Is Not How Much WEIGHT you lose ...

What Really Matters Is Not How Much WEIGHT You Lose, But How Much FAT You Lose

Where did your weight loss come from? Did you lose body fat or lean body mass? "Weight" is not the same as "fat." Weight includes muscle, bone, internal organs as well as lots and lots of water.

Let’s look at an example with some numbers so you can really grasp this concept of weight versus fat and then you can see, illustrated with specific examples, what will happen when you lose weight too quickly.

As an example, let’s take a 260 pound man who has a lot of body fat to lose - let’s call it 32%. With 32% fat, a 260 pounder has 83.2 pounds of body fat and 176.8 pounds of lean mass. Using this example, let’s look at a few possible scenarios with losses ranging from two to four pounds per week.

Weight Loss Scenario 1:

Suppose our 260 pound subject loses four full pounds instead of the recommended two pounds per week. Is this bad? Well, let’s see:

If he loses a half a percent of body fat, here are his body composition results:

256 lbs
31.5% body fat
80.6 lbs fat
175.4 lbs lean body mass

Out of the four pounds lost, 2.8 pounds were fat and 1.2 were lean mass. Not a disaster, but not good either. Thirty percent of the weight lost was lean tissue.

Weight Loss Scenario 2:

If he loses a half a percent of body fat and only three pounds, here are his results:

257 lbs
31.5% body fat
80.9 lbs fat
176.1 lbs lean body mass

These results are better. Although he lost less body weight than scenario one, in this instance, 2.3 pounds of fat and only 0.7 lbs of lean mass were lost.

Weight Loss Scenario 3:

What if he only lost two pounds? Here are the results:

258 lbs
31.5% body fat
81.2 lbs fat
176.8 lbs lean body mass

These results are perfect. Even though our subject has only lost two pounds, which seems slow, 100% of the two pound weight loss came from fat and he kept ALL the muscle!

Weight Loss Scenario 4:

Now let’s suppose he loses three pounds but he loses more body fat: .8%

257 lbs
31.2% body fat
80.2 lbs fat
176.8 lbs lean body mass

These are the best results of all. When the weekly fat loss is .8% (better than average), 100% of the three pounds lost is fat. So as you can see, yes, it’s safe to lose more than two pounds per week… but only if the weight is fat. If you lose three or four pounds per week, and you know it’s all fat, not lean tissue, then more power to you! If you lose four pounds and two of those pounds are muscle, you just shot yourself in the foot!

If as little as 20%-30% of your weight loss comes from muscle, when compounded over a few months, you’re talking about a massive muscle tissue loss which can dramatically slow down your metabolism, weaken you and turn you into nothing more than a “skinny fat person” (that's a person with low body weight because they lost so much muscle, but still holding stubborn fat because they shut down their metabolism).