Does muscle really weight more than fat?

a pound of fat and a pound of muscle both weigh a pound. Weight is weight. However, muscle is leaner. So while a pound of fat and muscle weigh the same, the muscle looks smaller, as it is denser.

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It takes quite a while to gain muscle. But when you do lift weights, your muscles will hold water, but that goes away pretty quickly. It's not all about the exercise. Food is a much bigger factor in losing weight.

a pound of fat and a pound of muscle both weigh a pound. Weight is weight. However, muscle is leaner. So while a pound of fat and muscle weigh the same, the muscle looks smaller, as it is denser.

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but i'm sorry to say that you didn't gain two pounds of muscle in a week. A lot of the 3.5lbs the first week was probably water weight. it's not like your body reformed 2 pounds of fat again this past week. I'd guess that your body is working out its water balance. just watch your sodium, keep drinking water, and stick to the plan. you'll lose those two pounds again and even more!

I started with a personal trainer a few weeks ago. My first week i lost 3-1/2#'s, now this week he has been working me really hard strength training and I show i'm up 2#'s and there's no way I should be up considering my diet and just the sweating alone. It discouraged me. A co-worker said it could be muscle gain but I don't buy it. i'm sticking with it no matter what, maybe i'm just retaining water. I'll be drinking it like a fish the next week.
So my question, is it possible it's muscle gain.????

It's water retention. Your body needs excess water to repair muscle and to store it along with glycogen in the liver and muscle for the next "anticipated" workout. It's normal and can last up to a couple of weeks till your body adapts.
And if you're on calorie deficit, this whole BS of "you're gaining muscle" is really just BS. To gain muscle, you need to have a caloric SURPLUS. It's possible to gain a little muscle if you've never strength trained before, but it would be minute. The best trainers who try to put on muscle are lucky to add 1lb of lean muscle a month even with spot on nutrition.

not likely in a deficit, and at that rate.

It is veryvery hard to gain muscle with in a deficit, secondly 1lb is 1lb, 1lb of fat is actually larger then 1lb of muscle.

It's water retention. Your body needs excess water to repair muscle and to store it along with glycogen in the liver and muscle for the next "anticipated" workout. It's normal and can last up to a couple of weeks till your body adapts.
And if you're on calorie deficit, this whole BS of "you're gaining muscle" is really just BS. To gain muscle, you need to have a caloric SURPLUS. It's possible to gain a little muscle if you've never strength trained before, but it would be minute. The best trainers who try to put on muscle are lucky to add 1lb of lean muscle a month even with spot on nutrition.

What he said.

One pound of anything will weigh a pound. BUT, one pound of muscle takes up less space (i.e. is more dense) than one pound of fat. A certain *volume* of muscle does weigh more than the same *volume* of fat.

If you keep at it, you should see inches lost, and eventually the pounds coming off, too. But weight can fluctuate so much throughout the day, due to so many things...water retention, food/beverage consumption, time of day, bowel/bladder elimination. Following a downward trend over time, and following inches lost, is much less frustrating than following the day-to-day fluctuations (which can be a few pounds).

No. A pound of muscle weighs the same as a pound of fat. Muscle is just denser.

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FYI I have resorted to copy and pasting my same reply when this topic comes up. The answer is yes, muscle weighs more than fat, and here is why.

Weight is a measure of force (so technically it is measured in newtons), specifically the force gravity has on an object. Whereas, mass is a measure of how much matter an object has (measured in mg, g, kg, etc…). Mass is constant, weight is variable (granted I think all of us are on Earth). I think we can agree on all of this, at least I hope so.

Furthermore, in order to compare two objects scientifically, you need to have both a constant and a variable. Saying that 1lb of fat weighs the same as 1lb of muscle is a given because you are only comparing the two constants and ignoring the variable. That is no different than me saying that 100 calories of butter is that same as 100 calories of lettuce, however the quantities of both will differ. So when someone says that muscle weighs more or has more mass than fat it should be assumed that we are not referring to the two obvious constants alone, but are referring to their weights as a variable with respect to a constant volume.

Additionally, when you refer to density you are, by definition, referring to mass and volume simultaneously since density = mass/volume. You cannot know a specific density without knowing both the mass and volume of an object.

So to see how mass volume and density all relate simply think of the following equation and you will never have to question this again.

Weight = (Density x Volume) x Gravity

So how does this formula help? Simple; gravity is constant because we are all on Earth, so if we hold volume constant, and we all agree that muscle is denser than fat, then the outcome is an increased weight.

I dont care if its muscle or fat,because when you are trying to dispose of the evediance its heavy either way:grumble:

This is an excellent point.

I dont care if its muscle or fat,because when you are trying to dispose of the evediance its heavy either way:grumble:

My thoughts exactly.

I started with a personal trainer a few weeks ago. My first week i lost 3-1/2#'s, now this week he has been working me really hard strength training and I show i'm up 2#'s and there's no way I should be up considering my diet and just the sweating alone. It discouraged me. A co-worker said it could be muscle gain but I don't buy it. i'm sticking with it no matter what, maybe i'm just retaining water. I'll be drinking it like a fish the next week.
So my question, is it possible it's muscle gain.????

There is a time when you are building muscle and the muscle is coming on to your body faster than you are burning the fat. You can sometimes see an increase in weight during this time, but at the same time, you can see inches coming off of your body because the muscle is more dense. As you gain muscle, it is more effective at burning calories than fat, and you will eventually see the fat burning faster because of your increase in muscle. Everybody's body is different, so the pace this happens for you will be different than for me, your cousin, or someone else on this site.

So. When all is said and done, is muscle heavier than fat....?