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 Subject: Muscle Density vs. Fat Density Category: Health > Fitness and Nutrition Asked by: holstein13-ga List Price: \$5.00 Posted: 04 Oct 2005 19:04 PDT Expires: 03 Nov 2005 18:04 PST Question ID: 576481
 ```We've all heard that human muscle weighs more than fat cells given the same volume. OK, I believe that, but how much more does it weigh? In other words, given a liter of fat and a liter of muscle, how much would each weigh? Of if you prefer, given a pound of fat and a pound of muscle, how much more volume would the fat have? Please cite only credible information here. I saw one site that said muscle weighs 3 times more than fat but they don't cite any references so I wouldn't consider that credible. I also saw one site that said fat weighs 7 lbs per gallon; but again, no references about where the info came from.```
 Subject: Re: Muscle Density vs. Fat Density Answered By: raisingmyhand-ga on 17 Oct 2005 16:30 PDT
 ```Hello Holstein13, Thanks for your question. I hope you will find this answer to be provided with solid scientific references. Summary: Muscle density is 1.06 g/ml and fat density is (about) 0.9 g/ml. Thus, one liter of muscle would weight 1.06 kg and one liter of fat would weight 0.9 kg. In other words, muscle is about 18% denses than fat. This should not be confused with the "energy density" of muscle and fat, which may be where you got the 3x figure that you mention in your question. I have made a special effort to find credible sources for the answer. Below I provide sources for the two numbers separately. 1. The density of mammalian skeletal muscle is 1.06 g/ml. "... 1.06 g/cm-3 which is the density of mammalian skeletal muscle" Source for quote: The Journals of Gerontology Series A: Biological Sciences and Medical Sciences 56:B191-B197 (2001) Specific Force Deficit in Skeletal Muscles of Old Rats Is Partially Explained by the Existence of Denervated Muscle Fibers Melanie G. Urbancheka, Elisa B. Pickenb, Loree K. Kalliainenc and William M. Kuzon, Jr.a,d http://biomed.gerontologyjournals.org/cgi/content/full/56/5/B191#R23 Reference given by the authors: Mendez J, Keys A, 1960. Density and composition of mammalian muscle. Metabolism 9:184-188. 2. The density of adipose tissue (fat) is about 0.9 g/ml "...by multiplying the density of adipose tissue (0.9196 g/ml)" Source: Association of adiponectin and resistin with adipose tissue compartments, insulin resistance and dyslipidaemia M. S. Farvid1, T. W. K. Ng2, D. C. Chan2, P. H. R. Barrett2 and G. F. Watts2* http://www.blackwell-synergy.com/doi/abs/10.1111/j.1463-1326.2004.00410.x "...on the assumption that the density of adipose tissue is 0.9g/cm3" Source of quote: Pediatric Research 55:437-441 (2004) Distribution of Adipose Tissue in the Newborn TRACEY A.M. HARRINGTON, ELIZABETH LOUISE THOMAS, GARY FROST, NEENA MODI and JIMMY D. BELL Source given by authors: Ross R, Léger L, Guardo R, De Guise J, Pike BG 1991 Adipose tissue volume measured by magnetic resonance imaging and computerized tomography in rats. J Appl Physiol 70: 2164?2172 I hope you find this to be useful and a complete answer to your question. Let me know if there is anything I can clarify. Regards, RMH Search Strategy: I searched Google using the phrase "density of mammalian skeletal muscle" and "density of adipose tissue". I used a computer in a medical center that has free, online access to many scientific journals.```
 ```"A corollary to this is that you may gain weight due to lifting weights, even while loosing fat weight. This is one of the greatest exercise myths. The myth is based in fact: muscle is more dense and weighs more than fat. The same weight of muscle take up nearly half the volume as the same weight of fat. The problem with this is that not very many people will be able to add the volume of muscle mass relative to fat lost to gain weight. Remember, the average man will add only 4 Kg of muscle mass in a rigorous training program." http://www.athleticadvisor.com/Weight_Room/fitness_myths.htm```
 ```It is interesting that you mention this myth because I never mentioned it in my post. However, you are right on target. I hear so called "exercise experts" telling their subjects to ignore the scale. It seams to me that dieting is a far more effective method to reduce fat than exercise alone. You wrote "The same weight of muscle take up nearly half the volume as the same weight of fat." Where did you get that info from? This seams like a very easy question to answer. All you need to do is buy a pound of pork and extract the same volume of fat and lean meat from the product. Then you can weigh each of them. Unfortunately, I don't have the tools to do that.```
 ```Everything in my previous post was a quote from this site: http://www.athleticadvisor.com/Weight_Room/fitness_myths.htm The diet/excersize plan you should take depends greatly on your goals. In the long term, working out is much more effective for losing fat than dieting alone. There is of course the short term effect of burning fat as you excersize, but the better benefits occur when the muscle you create by exercising greatly increases your normal metabolic rate (how many calories your body burns to sustain itself).```
 ```hey, i was just wondering about this BMI (body mass index). i weigh about 70kg and im 1,70 metres tall. usually to find your BMI you need to devide your weight by your hight squared. my BMI was 24.22. that shoudl mean that im nearly overweight. but the odd thing is im not. i look perfectly normal. i used to train martial arts before even. im pretty fit actually. why is that?```