I ask this question because I have been on a low-calorie diet and have been working out on my total gym once or twice a day and walking 2-2.5 miles a day five days a week for the past two weeks. In the mirror, I can clearly see muscle definition and fat loss, but my weight has only decreased by but a few pounds and, some days, it has actually gone up a pound. I am aware that muscle is heavier than fat and that muscle has a tendency to retain water. I also made it a point to say "all things being equal" because I am aware that how fast muscle builds vs. how fast fat burns depends on the intensity of your workout and also your diet. However, if my muscle tissue is building faster than I am burning fat, that would introduce an additional factor that could explain the erratic numbers I see while I am on the scale.

  • It is a lot easier to lose a lbs of fat than it is to build a lbs of muscle. In terms of why you are fluctuating, I can't really say. Jan 15, 2015 at 15:38
  • 1
    How long have you been on the program? Measuring your weight frequently (such as daily) will turn you into a nervous wreck due to its fluctuations. The general recommendation is weekly or biweekly :) Jan 15, 2015 at 15:42
  • Expanding on Kneel-Before-ZOD's comment, you don't necessarily want to reduce the number of measurements you take, but rather record your weight daily and take a 7 day running average. This will allow you to see any trends, while removing most of the daily fluctuations. Only measuring your weight weekly or even bi-weekly is still subject to the fluctuations you see day to day.
    – RyanO
    Nov 25, 2015 at 9:13

4 Answers 4


Muscle does not build faster than fat burns.

It sounds like your main issue is not that you are not burning fat or gaining muscle, but instead you're not actually measuring those things. Your body is not entirely muscle OR fat. In turn, when you weigh yourself you are not only measuring those two factors. You're measuring fat mass and lean body mass (muscle, bones, the food you ate for lunch, etc).

Simply, if you changed your diet and increased exercise you will most likely improve your body composition. You said you see that in the mirror; I would trust that over the scale. You can also use your physical fitness as a good measure -- are you lifting more, running longer, etc.

If you really want to continue to use the scale, then I agree with Kneel-Before-ZOD. Do it weekly or biweekly on the same day at the same time of day. And don't stress about it.

Good luck!

  • Going off of the last point, many people weigh themselves as soon as they wake up (or before eat/drinking breakfast). This will ensure more accurate measurements.
    – MB41
    Aug 31, 2015 at 19:58

Bodybuilders tend to interleave periods of 'ripping' with periods of 'bulking'. If you want to gain muscle fast, you will need to eat big time and will have to accept also 'gaining' a bit of fat and you will need to do mostly anaerobic exercises and skip cardio. If you want to loose fat quickly, you will have to undereat a bit and work out with lower weights higher repetitions, etc. You will need to accept loosing a bit of muscle. And yes, if you focus on the larger muscle groups, have a good bulking diet and work out schedule, you could gain muscle faster than you could loose fat when on a diet. Going on a bulk/rip cycle can be an amazing way to get in shape. Start off with bulking until your body fat percentage stops going down. Once you are at that point, start interleaving periods of ripping with periods of bulking.

  • Your answer is somewhat fraught with assumption and misconception. It implies that bodybuilders regularly cycle between what you call 'ripping' and 'bulking'. This is not accurate. 'Ripping', or, contest preparation, is only done for a short period of time (approximately 10 to 12 weeks) prior to a competition. It is a strict protocol of training and nutrition that cannot be maintained for long periods of time due to the physical and mental stress it causes.
    – rrirower
    Jan 16, 2015 at 18:27
  • It's goal is to maintain mass by stripping intra-muscular fat without “losing a bit of muscle”. And, contrary to popular opinion, it can be accomplished without resorting to “lower weights, higher repetitions”. In fact, what you propose as a “period of ripping with periods of bulking can be construed as yo-yo dieting. A better approach is to maintain a solid nutrition program while trying to stay within 3 to 5 pounds of a goal weight.
    – rrirower
    Jan 16, 2015 at 18:27
  • @rrirower, 10 to 12 weeks is a short period of time in your book? There are multiple reasons why 'ripping' can not be maintained and two of the most important ones are related to a hormone called leptin. Stripping intra-muscular fat without “losing a bit of muscle” is a nice goal, with current knowledge however its not a realistic goal though.A yo-yo diet is what happens if you focus purely on weight loss. You will loose weight (both fat and muscle), your BMR goes down and as a result your weight goes up again (this time mostly fat). Been there. Started out at 140kg@30%, ended at 110 kg@50%.
    – Pibara
    Jan 19, 2015 at 8:08
  • @rrirower, goal weight is utter nonsense, your weight really doesn't matter, your body composition does. You can get a lower body fat percentage by gaining muscle or by loosing fat. You can do both at the same time but than both will be slow in progress. You can gain muscle really fast if you are willing to accept fat mass gain (while still improving percentage wise) or you can loose fat really fast if you are willing to loose some muscle mass. If for example your goal is to go from 100kg@50% to 90kg@10%, bulking plus ripping will get you there much faster than trying to do both simultaneous.
    – Pibara
    Jan 19, 2015 at 8:17

Ok let's do some math.

One pound of fat is about 3500 kcal, and is about 45 cl or 15 fluid ounces in volume. You don't mention your weight or your diet, but let's say you've lost 1000 kcal/day, which is a very high rate of calorie loss, in two weeks, that's 4 pounds, or 60 fl. oz./180 cl. This might sound like a lot, but considering the fact that your burn fat from all of your body, it's not a lot of fat.

On the other hand, whenever you eat less, you will lose a lot weight in solids and fluids, this will also fluctuate a lot, you can assume that the error margin at your weigh ins are somewhere around 2% of your body weight, so having days of increased weight is perfectly normal.

Regarding muscle building, as others have said, it's a lot harder to put on a pounds of muscle than it is to lose a pound of fat. If you stay the same weight over a year, 10 pounds of added muscle weight is a very good result if you're completely new to lifting, if you're a man, and if you rest and lift well. That's less than a pounds per month! If you lose weight, it's even harder.


I have been working out regularily for over a year. I initially saw lots of fat melting away, but my weight went up by 4lbs 2k aprox in the 1st three months. In the end, by measuring my fat (pinch test) before and after. I gained equal to 7lbs in fat and gained 11 in muscle. I did not change my diet in that period. So in 3 months I lost 7lbs (5% for me) in fat while gaining 11lbs overall, everything stayed stable after the first 3 months.

As a woman, it almost made me really angry to see that I was gaining so much while working my butt off. But I could see the fat melting off quickly, so I didn't panic.

  • Sorry I LOST 7lbs in fat and GAINED 11 in muscle.
    – Andrea
    Nov 24, 2015 at 0:00

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