Fat Overshooting: A New Theory

by Chris Shugart

Stop the Regain After Dieting

Here's the real reason you regain body fat after a diet, plus three ways to fix the problem.

You've seen it. You've probably experienced it. It's called fat overshooting.

That's the sciency way of saying that after a fat-loss diet, most people gain all the fat back, plus a little bonus fluff. This is typically caused by hyperphagia, defined by Bill Campbell, PhD, as the obsessive and uncontrolled desire to eat. It seems to happen even more often when normal-weight people try to get ripped.

The question is, why does that happen? Well, according to Dr. Campbell, there are two theories:

  1. Through various mechanisms that kick in after a strict diet, including increased hunger, your body tries to regain the fat you worked so hard to lose. The over-the-top hunger remains until the body is back to "normal" – your pre-diet weight.
  2. This is the newer theory, promoted mainly by researcher Abdul Dulloo. It's not that your body is just trying to gain the fat back; it's trying to regain lost muscle mass. "Fat overshooting is a prerequisite to allow complete recovery of fat-free mass," he notes.

The gist: The hyperphagia effect doesn't wane after the lost fat is regained, but only after the lost muscle is regained. If the muscle isn't regained, as is the case with untrained individuals doing stupid crash diets, one could theorize that the overzealous hunger mechanisms stick around and lead to obesity. Even with weight-trained individuals like you, it's still easy to get lean, then get a little too chubby post-diet, diet again, and repeat the whole process until you hate yourself.

It's something to think about. And, if you think about it for more than a few seconds, your next question should be, "How do I prevent or minimize muscle loss when dieting?"

Three Ways to Stop the Muscle Loss

1. Eat More Protein

Low-protein diets are the single biggest reason that average people are overweight. Eat more protein and the rest of your diet autoregulates: you're not as hungry, you replace a lot of excess carbs and calorie-dense fats, and you're far less likely to lose muscle. For experienced lifters, the golden rule is a good baseline: eat about a gram of protein per pound of body weight, maybe a bit more if your fat-loss diet is strict.

Along with high-protein foods, consume micellar casein, which is both thermogenic (fat-burning), anti-catabolic (it prevents muscle loss), and satiating. MD Protein (Buy at Amazon) contains large amounts of micellar casein.

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If you prefer a regimented approach to dieting, try the 5/2 Protein Diet. And if you just plan to increase your protein intake, try to have a micellar-containing shake after lifting and before bed.

2. Keep Lifting Weights

That's easy enough. But some people opt for higher rep lifting protocols during diets, often with the idea of burning more calories. Instead, you might opt for more heavy sets with fewer reps. No, you won't build tons of strength as an experienced lifter during a diet, but that's not the idea. Instead, the goal is to "encourage" your body to hang on to muscle by signaling that you need it.

3. Don't Crash Diet

All things being equal, a slower diet helps you retain more muscle. Instead of dropping 1200 calories below maintenance, subtract 300 to 500 calories and have some patience. (Try the 300-Calorie Fix strategy.) Want to display some abs in the summer? Don't start your diet in June.

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Do you think the average American, who doesn’t lift weights, would need to begin lifting in order to regain the muscle mass lost from dieting?

Or would an increased protein intake and modest physical activity do the trick?

Somewhere in this video Eric Helms mentions a study where the subjects were so grabasstic that just eating more protein made them gain muscle mass.

There’s some evidence that increasing protein intake alone triggers muscle gains in untrained people who were previously not consuming much.

In one study on untrained, skinny-fat women, consuming 115 grams daily for 12 weeks lead to almost three pounds of muscle gain (and some fat loss) compared to women eating the same number of calories (maintenance) but only 69 grams of protein daily. None of them lifted weights before or during the study.

So, while dieting without resistance training is definitely not ideal (muscle loss, metabolism dysruption, fat overshooting, etc.), it’s technically possible to gain some muscle by just increasing protein intake, at least in low-protein eaters.

So, I guess the big question is this: how much muscle did the person lose while dieting for fat loss? My guess is that the muscle gained from increasing protein may not be enough, so lifting is always the best option. ABL: Always Be Lifting. And of course, diets with a lot of protein are superior to diets with less protein. That would prevent most, if not all, of the muscle loss to begin with.

This is inaccurate, and it’s important to note that this is a study, not a clinical trial. That’s why Dr. Dullulu mentioned, “We have two theories.”…yes i called him dr. dululuuu!!!

You’ll observe individuals who started a diet with over 30% body fat and 25% muscle mass, and after 18 months, they’ve reduced their body fat to 16% or lower while increasing muscle mass to over 35%, only to end up in a binge-eating cycle.

This happens because, with low body fat, sex drive decreases significantly, and the body shifts into binge-eating mode to restore balance.

During dieting, key peptides are affected due to the hypothalamus and pituitary glands being impacted. This is one of the main reasons we see a drop in certain amino acids, especially cysteine, tyrosine, isoleucine, and leucine. If I remember correctly, dieting might also affect levodopa levels.

Other neuropeptides affected by dieting include oxytocin and dopamine, which are also made up of the amino acids I mentioned. Additionally, dopamine receptors (D1 to D5) are impacted—not that they stop functioning, but their binding to specific molecules changes.

This article spreads misinformation and shouldn’t be published for readers, as it presents inaccurate details.

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“dieting—especially low-fat or low-carb diets—does lead to lower serum testosterone levels”

That’s not what you said before. Let’s try to be consistent please.

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This is traditional theory.

Do you have any evidence that its not the body trying to reclaim lost muscle?

I’m surprised of all the hormones you threw out there, that leptin was not one of them.

Working out boosts testosterone levels, but on the flip side, dieting—especially low-fat or low-carb diets—does lead to lower serum testosterone levels. There are numerous studies on this very topic.

The evidence comes from a study I read, though I can’t find it at the moment. I remember it was conducted by a doctor from Denmark, Sweden, or Finland, possibly named Hamlyan or Halyan.

But yes, dieting does lead to a decrease in serum sex hormones.

And why would I bring up leptin? It’s not an amino acid; it’s a hormone.

Because it plays a large role in metabolism and hunger levels - meaning it directly relates to rebound fat.
Seems pretty relevant.

Thanks!

I was thinking in terms of older folks, like my 80-year-old parents, who may lose muscle due to recovery from, say, surgery or long illnesses.

I wonder if simple activty–walking, biking, yoga, whatever–and plenty of extra protein would lead them to regain lost muscle under these circumstances.

This should be easy enough to prove, or at least ad some weight to, but on face value it doesn’t make much sense. Unless the person has lost so much muscle along with the fat, maybe through a fast or poorly planned crash diet? With zero protein or exercise? What’s the threshold?

Also, what is the mechanism that lack of muscle mass leads to an over-hungry state? Do we feel hunger cues because we don’t have enough muscle? I’ve never heard that posited before, but seems too simplistic an explanation for hunger / cravings.

IDK I’m not buying it … yet.

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I was searching around and found this article saying losing muscle increased hormones like ghrelin and IGF-1, which increase appetite.

Surprising Way Appetite Is Affected By Fat, Muscle & Bones

By Emily Wilcox

" When we lose muscle mass, we see a change in certain hormones that are produced in our muscles. For example, the amount of ghrelin, which stimulates appetite, goes up. Secondly, less muscle can lead to a decrease in a protein messenger called myostatin — this stops muscle growth. So, when myostatin goes down, another molecule, called insulin-like growth factor (IGFs), goes up, and this also increases appetite."

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Thank you for finding this. I am curious about this tho … doesn’t low Myostatin cause MORE muscle growth? Or is that just more muscle growth POTENTIAL?

The ghrelin levels make sense, I wonder again what the set point is tho, does that change based on muscle mass prior to muscle loss?

IGF also makes sense from what I understand of the interplay with IGF-1 and insulin (insulin lowering appetite).

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I’m a scientist by profession, yet I don’t apply overly science-y stuff to my nutrition and training. Part of the reason (as this thread shows) is that nutrition and training is really hard to study as a science. There are so many variables it becomes impossible to attribute outcomes to individual foods/supplements and training types.

As a 51 year old, I’ve found it’s easier to not get fat and out of shape in the first place. Then I don’t need to worry about things like IGF-1, myostatin, and leptin when I’m deadlifting.

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I heard deadlifting is Terrible for your myostatin.

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That’s why I typically use the trap bar. It tends to only effect the Krebs cycle and only places modest strain on myostatin. C’mon, I thought this was well known.

That’s a good question. More protein and some general activity certainly wouldn’t hurt. At their age, they’re probably dealing with sarcopenia. I have an article on that below with some details, but fish oil and vitamin D seem to help too. I have my 80-year mother on both, along with providing her with protein shakes (but getting her to be consistent with them is another story!)

It makes sense. The body is seeking homeostasis, “wanting” the muscle back, so it uses its only tools: hunger triggering mechanisms/hormones.

We’ve seen the same thing happen with certain nutritional deficiencies: the body is lacking a vitamin, a mineral, protein (The Protein Leverage Hypothesis) or omega-3s, so it shoots off the hunger signals or the “I’m not full” signals. Problem is, there’s not much info in that “feed me” message, so people just eat more of the same junk and don’t fill the deficiency holes. Also related: Toxic Hunger.

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It is pretty cool that once you become a muscular bad-ass, your new homeostasis is muscular bad-ass.

Can temporarily starve myself to set up more gains?

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