starvation mode, myth or truth?

SanteMulberry wrote: »

psulemon wrote: »

hanymamdouh wrote: »

Based on personal experience it is a truth, but under 400 kcal/day

What you experience was probably severe muscle loss and metabolic adaptation/adaptive thermogenesis. If you starve your your body, your metabolism will become more efficient and burn less calories.

^^^This^^^...The body, in its "wisdom" will, when the calories are too low, shuttle the available calories to essential tasks. Maintaining muscle mass is a "luxury" in the situation where there is little food forthcoming. In addition, skeletal muscle burns far more calories than other types of tissue in the body, so it will be "cannibalized" by the body which is desperate for calories to maintain essential functions. Hormonal alterations will also take place--the reduction of thyroid hormone will be one adaptation, and the body will now be burning fewer calories just sitting still. The result of the reduced muscle mass and the new smaller body is a significantly lower calorie burn than before the "starvation" diet was pursued. And that is a setup for regain when that person resumes what he/she thinks are calories needed for "maintenance". Small reductions in calories along with increased activities (especially resistance training for maintaining muscle mass and burning body fat) is much the preferred way to avoid metabolic adaptation/adaptive thermogenesis. It was demonstrated many years ago with released prisoners of war, that the way to go for gaining weight, in those who are painfully thin, is to alternately "starve" and then allow them to eat "normally". Slow and steady wins the race (for long-term weight loss). The real goal is to not only lose as much body fat while maintaining lean body tissue as possible but for the metabolism to stay as healthy as possible. Because of the influence of estrogen (which works to maintain fat stores) and because they have a smaller lean body mass, women are more likely to fall into metabolic adaptation when on very low calorie diets. To counter this as much as possible, women, even more than men, need to lift weights and avoid drastic calorie reductions.

Thanks for that explanation. So are we defining starvation mode as eating so little that even the muscle in your organs starts to be cannibalized? Or is that just starvation, period. I'm also very interested in your comment that the body chooses to cannibalize skeletal muscle first. I read recently about incidences where an obese person has starved to death, but dies technically still obese. Meaning it's not an orderly progression of glycogen/fat/LBM. I'd love to read something reputable supporting your statement. Not trying to argue, I want it to be true!

heyhey2015 wrote: »

I think although I log everything, maybe I am off on calculations and am consuming more than I realize, and that is why I am not feeling really restricted, or bad. I do some resistance and hand weight excercise, and walking. Like I said i didnt feel it was rapid weight loss, i am at the end of the two months that was the time period, lost about 18 pounds. Going forward I am going to increase my calories and my activity. This is a lifestyle change for me. I was very sedentary and my portion sizes were really off. My doc is not a weight loss dr, she is an md. Thanks for all (most) comments and help.

Most MD's have little to no training. Before you do that, I would be referred to a dietitian.


Most of us don't like 1000 calorie diets because it will lead to increased muscle loss and if done for long periods can lead to metabolic adaptation, so gaining will be easier. Also, many of us prefer to concentrate on maintaining muscle and have almost all of your loss from pure fat. Reasoning being that body composition impacts look more than weight. And like I always say, weight loss will make you look good in clothes but fat loss will make you look good naked.


And if you want our recommendations, post your height, weight age and current workout routine. We can provide you a solid plan to achieve your goals, whatever they are.

heatherdeb2015 wrote:

Doc wants me to stay around 1000 calories, 40 p, 30f, 30c nutrition scale just for a couple months. It is working, with light exercise. I feel great but I am wondering about all the talk of starvation mode

Once again: How tall are you? What's your current weight?
Your profile page is almost completely blank, no info available.
Here's a post I did with a bunch of links to things new people would find useful, including sexypants, accurate logging, and goal setting.

1 - Unless you're short enough that 100 lb is a healthy weight (4'5" to 5'1"), eating 1000 cal / day isn't good.
Here's a BMI calculator which will show you what a healthy weight for your height is. http://www.eatright.org/bmi/
Normally I'd say "do what your doctor recommends", but it seems s/he doesn't even know healthy macro levels, and with only 50 lb to lose going on such low calories doesn't make sense. Doing a small deficit, consistently, will work out better; you're less likely to regain because you're learning healthy eating habits.
With 50 lb to lose, yes, you could do 1 lb per week in a healthy way. (Figure out what you need to maintain your current weight & cut 500 cal / day.) But as you get closer to a healthy weight that will slow, and you should make your deficit less. I've averaged 1.5 per week over the last year, starting with 110 lb to lose. Now I'm down to about 35 to go, and am expecting 0.5 lb per week... sometimes that's a struggle.

2 - The macro levels s/he recommended aren't healthy. Protein is too high, carbs are too low. Here's a table which explains the healthy ranges:
http://www.iom.edu/Global/News%20Announcements/~/media/C5CD2DD7840544979A549EC47E56A02B.ashx
page 1, carbs, 45 - 65% of calories (4 cal per gram)
page 2, fat, 20 - 35% of calories (9 cal per gram)
page 4, protein, 10 - 35% of calories (4 cal per gram)
Eating lower carbs & higher protein has been shown to lead to more weight loss, but stay within the healthy ranges: 45% carbs, 20% fat, 35% protein.

BTW, yes, there is such a thing as "starvation mode", but it's not what most people think & it's hard to get there, takes a long time of abusing your body.
The body needs energy to run.
It prefers to get that energy from carbohydrates (glucose [blood sugar], then glycogen [storage carbs in muscle & liver]).
If that's low, it will burn fat.
If that's low, it will burn protein (muscle). This is an inefficient conversion, and is risking death (when the heart & diaphragm stop functioning) in hopes of finding food first. THAT is starvation mode.