"Starvation mode" myth - great blog

jid314

I found this great blog post regarding "starvation mode." I don't think people shoudl starve and deprive themselves to lose weight, but this is dead on.

http://fattyfightsback.blogspot.com/2009/03/mtyhbusters-starvation-mode.html

But what if I just don't go below the magic "1200" that "everyone" says "no one" should go below? That must be what they mean by "starvation mode," right? If I stay at 1200, I will lose weight but if I go below that, I won't.

The problem with this idea is that, if it were true, no one would die from starvation and obviously people do. Clearly, even if you eat what is obviously too few calories to be healthy, such as an anorexic does, you will continue to lose weight

So where did this idea -- that not eating enough calories makes you not lose weight -- come from?

It started with the famous Minnesota starvation study. Some normal-weighted men agreed to live on a compound where their exercise and diet was strictly controlled. For portions of the study, they were on a "starvation diet" which is defined as 50% of the calories your body needs to function.

For me, these days, that's about 750-850 calories a day. So I was on a starvation diet up for the first four months after my surgery. Yet I lost weight just fine during that period -- better than fine, really. Most of the people on The Biggest Loser are also on starvation diets, from what I can tell. They may eat a lot more than I do but they also exercise strenuously 6-8 hours a day. So they are often below 50% of their calorie expenditure for the day. They seem to lose just fine too.

How can this be?!

The answer lies in what actually happened to the Minnesota guys when they were on their starvation diets.

Like most of us on a diet, their metabolisms did slow down. In fact, after they'd been on this diet for a while -- we're talking months, not days here -- their body fat percentage got to a point below what is considered minimal to live on (about 5% for a guy, 6% for a gal). At this point, their metabolism had slowed down as much as 40%. But -- and this is the important point for those of us on a diet -- they continued to lose weight. Even with that big of a slow down in their BMR (Basal Metabolic Rate), they were still operating at a great enough calorie deficit to lose.

On the other hand....

So why are we told not to go under 1200 calories a day, unless under a doctor's supervision?

Mostly because, the more you reduce your intake, the harder it is to get the nutritients you need from food. If you are on a very low calorie diet (as I am), you need to see your doctor(s) regularly, get labs done regularly, etc. Not to mention, vitamin supplementation is a must. Doing what I'm doing on your own can be dangerous, as you may not know or noticed the signs of a vitamin or mineral deficiency. Don't forget: some vitamin deficiencies can kill you!

Another reason not to go below a certain calorie expenditure is that human beings are not machines and, unlike the guys in the Minnesota study, we aren't living on a compound with our activity and food strictly controlled. As a result, when we reduce our calories substantially, there is a tendency to subconsciously (or even consciously) reduce our calorie expenditure. Combine this with our tendency to under-report what we eat and over-report our exercise, and you can see where we can get into trouble.

samatalma

:grumble:

Is this "starvation mode" crap going to just be one of those things? This has to be like the 4th time I've seen something about this today.

Just agree to disagree!

grannygethealthy1111

The Starvation Myth
The idea that "not eating enough" causes the body to stop losing weight because it goes into "starvation mode" is a popular myth among dieters.
Article By: The Weight Watchers Research Department
The Starvation Myth
Restricting calories during weight loss lowers metabolism1 because the body becomes more efficient, requiring fewer calories to perform the necessary daily functions for survival. Consequently, this can slow (but not stop) the anticipated rate of weight loss.

For example, if an individual needs 2,000 calories per day to maintain weight, reducing intake to 1,500 calories, assuming exercise stays the same, should provide a 1 pound per week weight loss (Note: 1 pound of weight is equivalent to about 3,500 calories). Furthermore, reducing to 1,000 calories should result in a weight loss of 2 pounds per week and going down to 500 calories a day should result in a weight loss of 3 pounds per week. However, if an individual actually reduces their intake to 500 calories, the weight loss would not likely be a steady 3 pounds per week because of the reduced metabolic rate. It would likely be around 2¼ to 2½ pounds. This "lower than expected" rate of weight loss is a lot different than "no" weight loss as the "starvation mode" notion proposes.

It is unclear as to whether the relationship between reduced caloric intake and a lower metabolism follows a straight path or becomes more pronounced the greater the caloric reduction. Some studies have found no significant reduction in metabolism until the caloric restriction is quite large (e.g. 800 calories or less per day).2 Others suggest a linear relationship with small reductions in metabolism accompanying small reductions in caloric restriction, with the gap increasing as the caloric deficit is enlarged.

While there is no biologic evidence to support the "starvation mode" myth, there may be behavioral reasons why weight loss stops when calories are severely reduced. Over-restriction of calorie intake, known as high dietary restraint is linked to periods of overeating, hindering successful weight loss.3 (For more information on dietary restraint, read the Science Center article, The Skill of Flexible Restraint).

Metabolism after Weight Loss
The good news is that after the weight-loss goal is achieved and weight has stabilized, it does not appear that the dip in metabolism is permanent. Several rigorous studies done at the University of Alabama in Birmingham showed that metabolism goes back to expected levels with sustained weight loss,4 discounting the theory that a lowered metabolism helps to explain the common phenomenon of weight regain following weight loss.

Weight Watchers Approach
The <PointsPlus system is designed to provide a caloric intake that supports a healthy rate of weight loss, produces a minimal reduction in metabolism and avoids inducing too-high levels of dietary restraint.

This content is reviewed regularly. Last updated December 17, 2011.

view footnotes

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Other Science Library Topics

Weight-Loss Plateaus
Calories, Metabolism and Weight Loss
Increasing Metabolism


FOOTNOTES

1 Saltzman E, Roberts SB. The role of energy expenditure in energy regulation: Findings from a decade of research. Nutr Rev. 1995. 53:209-220.

2 Burgess NS. Effect of a very-low calorie diet on body composition and resting metabolic rate in obese men and women. J Am Diet Assoc. 1991 Apr;91(4):430-4.

3 Rogers PJ. Eating habits and appetite control: a psychobiological perspective. Proc Nutr Soc. 1999 Feb;58(1):59-67.

4 Weinsier RL, Nagy TR, Hunter GR, Darnell BE, Hensrud DD, Weiss HL. Do adaptive changes in metabolic rate favor weight regain in weight-reduced individuals? An examination of the set-point theory. Am J Clin Nutr 2000 Nov;72(5):1088-94.
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