Fast Weight Loss & Hunger Hormones
Posted: January 27, 2012 Filed under: Blog, Research Reviews Comments Off| Summary: Short-term very-low-calorie dieting disrupts powerful hormones that control appetite, hunger, and satiety for up to a year after a strict diet. Crash diet now, feel hungry later… even several months later. |
What is the top New Year’s resolution? Lose weight.
Every year, people with good intentions set out to lose weight, only to have even more weight to lose the next year later. (Resolutions seem like such a good idea when you’ve got a party horn in your hand and a gold cardboard top hat on your head, swimming in a champagne-induced fog.)
One problem is that people try to lose weight quickly. Unfortunately, even if they manage to drop a few pounds fast, they bounce right back… and often, keep on gaining.
By slowing down the weight loss process and teaching life-long healthy habits, PN’s very own Lean Eating program is designed to avoid the cycle of perpetual weight loss.
Now, research confirms our methods. (But we knew that already.) Only slow and steady progress leads to lasting change. Why?
Appetite hormones: Why self control is not the problem
Myth: weight loss is all about self control.
People berate themselves or are judged by others for carrying a few extra pounds. To be fat means you’re weak-willed, spineless, and/or impulsive.
Fact: Powerful hormones control our perception of appetite and hunger, as well as our eating behaviour.
While you still have the option of self-control, your body definitely has a strong voice in the matter. And “willpower” breaks down easily under stress; when blood sugar is low; and/or in environments that don’t support weight loss (like an office where everyone has a candy dish and it seems like someone has a birthday cake every day).
Here are some of the more well-known hormones that influence appetite, hunger, and satiety.
| Cholecystokinin (CCK) | Released in the small intestine when fats and proteins are eaten. Receptors that respond to CCK are not only found in the gut but also in the brain. In the brain CCK depresses hunger, meaning the more CCK you have floating around the less hungry you are, and the less you’re likely to eat. This is why a lower-carb, higher-protein, higher-fat diet tends to make people feel fuller longer. |
| Glucagon-like peptide-1 (GLP-1) |
Delays stomach emptying time that may make you feel more full. |
| Gastric inhibitory polypeptide YY (PYY) |
Secreted by small bowel and colon in response to food. Inhibits hunger. |
| Leptin | Mostly released by fat; decreases hunger. If you want to lose weight you’d want to have more leptin. |
| Ghrelin | Made mostly in the stomach; acts on the brain (hypothalamus) to stimulate hunger. If you want to lose weight, you want less ghrelin. |
For more about leptin and ghrelin take a look at another research review of mine on leptin and ghrelin.
The ideal hormone combo to suppress appetite and help you lose weight would be:
- more CCK, GLP-1, PYY, and leptin
- less ghrelin
What happens to hormones over the long haul?
The study I’m reviewing this week looks at what happens to appetite hormones after 10 weeks of dieting up to 1 year later. Yup, your lemon-cayenne diet from last year may be making you feel more hungry this year.
Sumithran P, Prendergast LA, Delbridge E, Purcell K, Shulkes A, Kriketos A, Proietto J. Long-term persistence of hormonal adaptations to weight loss. N Engl J Med. 2011 Oct 27;365(17):1597-604.
Methods
This year-long study involved 50 people with BMI between 27 and 40 (classified as overweight and obese), who went on a crazy low-calorie diet for 10 weeks (though the researchers called it a very-low energy diet).
What’s a crazy low calorie diet? Oh, say 500-550 kcal for people that had an average weight of 95 kg (209 lb), which is one-third of their basal metabolic rate. To live without moving at all, these volunteers would need about 1700 kcal on average. No question they were really hungry and needed a hell of a lot of will power to stay on this diet.
The problem with calorie math
Basal metabolic rateBMR is the amount of energy you need to live when at rest. The most common equation to calculate BMR is the Harris-Benedict equation. BMR calculation for men BMR = 66.5 + (13.75 x weight in kg) + (5.003 x height in cm) – (6.755 x age in years) BMR calculation for women BMR = 655.1 + (9.563 x weight in kg) + (1.850 x height in cm) – (4.676 x age in years) Here’s an online BMR calculator, if you don’t want to do the math. |
This intake of 500-550 kcal means that each day these volunteers are eating at least 1200 kcal less than they need.
Since fat has 3600 kcal/pound, you could use basic (and flawed) calorie counting to figure they should lose a pound (0.45 kg) of fat every three days. At the end of 10 weeks (70 days) they should lose just over 23 pounds (10.6 kg), or 11% body weight in fat.
The problem with thinking of yourself as just fat that’s burned like a candle is that you overlook things like hormones that through evolution respond to starvation by storing calories more efficiently.
A few hundred years ago, it was a good thing that your body responded to starvation by storing as much fat as possible. Thrifty hormones saved lives. Now when starvation is self-induced in a sea of food it causes problems.
Results
During the first 10 weeks of the study, when the volunteers were eating a very low calorie diet, they lost 9.4 kg (20.7 lb) of fat and 4.1 kg (9 lb) of lean body mass, but that didn’t last over the next year.
As the year went on after the diet, they slowly gained half the weight they lost. At first glance, that doesn’t sound too bad. They lost a fair bit of weight in a short period, and then a year later, they were still ahead of the game.
Hormonal effects: short term
The problem is what happens to these volunteers’ hormones — the hormones like leptin, ghrelin, peptide YY, etc. — that regulate appetite, hunger, and satiety.
After 10 weeks of starvation the volunteers had less leptin, peptide YY, and cholecystrokinin, as well as more ghrelin and gastric inhibitory polypeptide. The result: The volunteers felt more hungry. Cue the need for even more will power to keep the weight off. Sound familiar?
Hormonal effects: long term
We knew that crash dieting messes up appetite regulatory hormones for a short period, but until now, nobody had looked at the long-term effects of very low calories on these hormones.
Why didn’t anyone look at what happened a year or more later?
Well, it’s hard to get people signed up for a year-long anything, let alone having them go on a starvation diet for over two months first. Plus, it’s a bit of a surprise that a short term diet would do much a year later. These scientists must have had to convince a lot of people that this study was worth doing.
One year after dieting the volunteers still had less leptin, peptide YY, and cholecystokinin; and more ghrelin, gastric inhibitory polypeptide and pancreatic polypeptide.
What happened to hunger? Still higher after a year. Think about that. A full year after dieting, the volunteers still felt more hungry. No surprise that most dieters regain weight lost and more… eventually.
Conclusion
If you try to lose weight quickly, you’ll end up trying to lose it every year instead of taking a year to lose the weight once.
It’s clear that very low calorie dieting has long term impact on hunger and appetite hormones lasting at least a year. Now imagine what multiple crash diets might do.
By the way, stringent and chronic restriction also affects hormones that control gastric motility (the speed at which food is processed) and neurotransmitters (brain chemicals).
Thus, if you regularly “diet”, not only do you end up always hungry, you have indigestion and “brain hamsters” like anxiety or depression, and you rarely feel psychologically satisfied by eating — you always want more, or have strong cravings. Show me a “professional dieter” and I’ll show you someone who feels generally lousy physically, mentally, and emotionally. Hormonal disruption is strong stuff.
Could yo-yo dieting lead to cumulative changes in appetite regulation hormones? Very likely. Several years of yo-yo dieting later, you may feel much more hungry than when you started. Good luck with willpower then.
Bottom line
Lose weight quickly while nearly starving, only to gain most of it back (or more) and feel hungrier than when you started. Or lose weight slowly, for good, and feel better than ever… eventually.
What would you choose? If you want door #2… well… have we got a program for you.
Click here to join the waiting list.
The Skinny on Sodium Intake: Is Salt Bad for You?
Posted: January 26, 2012 Filed under: Blog, Cressey Performance, Is Salt Bad, Jordan Syatt, Salt, Salt Intake, Sodium Consumption, Sodium Intake, Sports Nutrition, Strength and Conditioning, strength and conditioning program Comments OffToday’s guest post on sodium intake comes from current Cressey Performance intern, Jordan Syatt.
Sodium intake is a highly controversial topic within the fitness industry, mainstream media, and even the medical community. Very simply, everyone wants to know: “Is salt bad for you?” Nobody seems to have a clear-cut answer.
While many are quick to demonize the tasty mineral, I’ve long wondered if the evils associated with salt are the result of poorly constructed and misinterpreted research or actual cause for concern.
In an attempt to settle the debate once and for all, I began to dig up all the research I could find pertaining to sodium intake, high blood pressure, cardiovascular disease, and general health.
To make things as simple as possible, I’ve outlined my findings below. I think the results may surprise you!
Sodium Intake: What Does the Research Say?
First and foremost, high-blood pressure is perhaps the most prevalent risk factor associated with cardiovascular disease (CVD). Bearing in mind that CVD is currently the world’s leading cause of death, any information we can find to aid in reducing the risk of CVD is of the utmost importance.
Therefore, considering it is well established that diets excessively high in sodium may result in increased blood pressure (BP), it should come as no surprise that doctors and health professionals alike strongly encourage maintaining a low-sodium diet in the long-term. Epidemiological research suggests high-salt diets may not only affect blood pressure (BP) and thereby cardiovascular disease (CVD), but could also “increase the risk of stroke, left ventricular hypertrophy and renal disease.”
Perhaps worst of all, great sodium consumption tends to cause water retention, thus giving leaner individuals a noticeably “softer” appearance. In other words, their abs won’t appear to be as cut-up.
What the hell, salt!?!?
Based on the information provided above, it would appear as though high-salt diets are the primary cause of illness, death, and guys making excuses for why they don’t look as lean as they should.
We should probably cut it out of our diet, right?
Not so fast.
While high BP is certainly a major risk factor of cardiovascular disease, recent research has clearly shown the ratio of sodium intake to potassium intake within the diet has a much greater effect on BP than sodium (or potassium) alone.
Other studies have confirmed this finding and even the USDA recommends individuals place an emphasis on increasing potassium-rich foods and/or lowering sodium intake in order to lower BP.
While excessive sodium consumption can have a negative impact on BP (thus increasing one’s risk of various diseases), simply increasing the amount of potassium consumed on a daily basis holds the same benefits as lowering salt intake. As low-sodium diets are rather difficult to maintain in the long-term, placing an emphasis on potassium-rich foods may help individuals keep BP in check without causing undue stress notably in social situations.
In addition to the ratio of salt to potassium within the diet, other factors such as age, gender, genetics, activity level, and body fat are tremendously significant in determining ones risk of high BP, CVD, and other related illnesses. Not surprisingly, exercise and weight loss significantly reduce the risk of CVD. As such, rather than solely focus on reducing salt intake, beginning an appropriate training routine and maintaining a healthy body weight would most likely be the ideal first step in preventing CVD.
Finally, one need only look at the extremely high amounts of sodium in processed foods to understand why greater sodium consumption is associated with high BP and CVD. I’d venture to guess that those individuals who base their diets largely on processed foods are not only consuming too much salt, but are also not eating enough potassium, neglecting to exercise, failing to get an adequate amount of sleep, not maintaining an appropriate body weight, nor living a healthy lifestyle in general.
Taking the above into consideration, is it really the heavy sodium consumption causing high BP and CVD? Or, could it possibly be the overall sedentary lifestyle, overconsumption of processed foods, being overweight, etc?
I bet it’s the latter.
If otherwise healthy individuals are eating a diet largely consisting of whole/unprocessed foods, consuming adequate potassium, regularly exercising, and maintaining a healthy bodyweight, they can probably stop worrying over the minutia and feel free to add a dash, or two, of the ever-so-tasty mineral.
My General Recommendations:
Individuals should maintain a diet largely consisting of whole/unprocessed foods and make a concerted effort to acquire enough potassium on a daily basis. Examples include, but are not limited to, baked potatoes, cooked spinach, bananas, oranges, and cooked beans. For a detailed list of potassium-rich foods, click HERE. Additionally, I encourage individuals to follow an appropriate strength and conditioning program designed specifically for their individual needs.
Note: those who already have high blood pressure, first and foremost, you must consult with your primary care physician and follow his/her directions, as various anti-hypertensive medications can interact differently with food and exercise. Plus, you want to find out why you are hypertensive in the first place in order to individualize your treatment approach.
I hope you enjoyed this article, and if you have any questions please feel free to leave them in the comments section below.
About the Author
Jordan Syatt is a strength training and nutritional consultant out of Boston Massachusetts. He is Westside Barbell Certified, currently interning at Cressey Performance, and studies Health Behavior Science at the University of Delaware. In addition to actively competing in various Powerlifting Federations, Jordan works with a diverse population of clientele, focusing on fat loss, mass gain, and athletic performance. Jordan is the owner and operator of www.syattfitness.com. Feel free to contact him directly at: jsyattfitness@gmail.com.
Sign-up Today for our FREE Newsletter and receive a four-part video series on how to deadlift!
Using the Ground in Training – An Under-Rated Tool
Posted: January 25, 2012 Filed under: Back Pain, dyna discs, golf, Sport-Specific, Unstable Surface Training Comments Off John Izzo is a lot like me. A hard-working guy that genuinely cares about getting better as a coach and trainer, so that his clients and athletes get better results. John offered to write a guest post for today, and … Continue readingStrength and Conditioning Stuff You Should Read: 1/24/12
Posted: January 25, 2012 Filed under: Blog, Bret Contreras, deadlift, deadlift technique, Deadlifts, Dean Somerset, How to Deadlift, Resistance Training Comments OffHere’s this week’s list of recommended strength and conditioning reading:
How Much Strength Do Our Athletes Need? – I thought this was an outstanding piece from Rob Panariello at Bret Contreras’ blog. It’s a question I’ve asked myself a lot over the past few years, and Rob does an excellent job of discussing how the answer is likely different for every athlete.
Paula Deen’s an Idiot – On the surface, this blog post from Dean Somerset seems to be a rant on this outrageous example of hypocrisy with respect to Deen’s announcement that she had Type 2 Diabetes. While that would have been spot-on, Dean kicked it up a notch when he busted out some great statistics to show that her “it was my genetics” argument was bogus. Wildly entertaining; well done, Dean.
What a Puppy Can Teach You About Resistance Training Progress – I came across this article while I was searching for another one in my archives. I wrote it shortly after we got our dog (who is now about 1.5 years old), but the message still resounds.
Sign-up Today for our FREE Newsletter and receive a four-part video series on how to deadlift!







