Is it true that we lose muscle and fat during weight loss?

If ALL WLS people as well as dieters, lose weight consisting of both fat and muscle together...and MOST dieters/wls people are NOT body builders (my first point which was mistaken, horribly...my fault for not explaining myself a little more clearly that I am talking specifically about just regular, WLS people, during the first year post op) then how is it that as soon as someone hits a plateau the first thing some people say is "you might be gaining muscle" whether they KNOW if the person is lifting weights/strength training or NOT???? 'Cause lets face it, you don't gain "pounds" of muscle by walking on a treadmill/spinning on a bike generally, not saying it's impossible, but when I never saw a dude with muscles, spinning or running laps and eating extremely low carbs and 600-800 calories a day and barely able to eat enough protein a day (which is not enough to fuel significantly contribute to muscle weight gain). Eating a deficit of calories and carbs your body starts using the protein/muscles as fuel and we go into KETOSIS ..then HOW can one be gaining muscle if we are losing 20%? ALSO...Women do not GENERALLY have the hormones (testosterone) to look like Hercules especially while losing the amount of weight we lose on such a calorie/carb restricted diet due to WLS and the diet that comes with it! Don't you need a lot of complex carbs (foods that turn into glucose) to gain muscle??? And protein not to gain muscle but so you don't lose as MUCH muscle while losing fat???... I think that's how it works ...I'm sorry, I guess my logic is making me stupid again...But my logic says that if we are mostly in ketosis the first year, we are losing muscle not gaining it...and the newer diet rules that surgeons are handing out are extremely low carbs of any kind which are completely opposite the muscle building diet! I still believe that a lb of fat is the same exact thing as a pound of muscle regardless of how many of you say I am wrong...If 99% of people tell the same lie, it doesn't make it right! Just ask Chris Columbus... But that's okay! I understand you are trying to get me to understand the volume vs weight (I already know that and mentioned it in my first question rather clearly...That's not the point at all!) :) It's okay...I just see weight gain during the first year as water retention mostly (or over eating, eating the wrong foods again, not exercising) and sure there are some that will lose much of their weight fast and begin gaining muscle weight well into the last half of their first year with rigorous weight lifting/training...I just thought it was overly hopeful to call weight fluctuations muscle gain...I'm sorry...If it makes everyone happy so they can understand my point better...I will say it myself again "Muscle by volume is/looks heavier than fat" Okay? ...and weight gains can be muscle weight if you are weight/strength training vigorously rather than doing mostly cardio and eating plenty of complex carbs, protein and calories to do this. Don't you have to EAT in excess to gain weight...whether the weight is fat OR MUSCLE! (Isn't that how the whole "volume" thing works?) NO? If you are only eating 600-800 cals a day...I'm sorry, I do not believe you are gaining muscle! I could be wrong...I'd gladly say so if I thought I was! SO my question is: Is it true that ANYONE/dieters lose muscle and fat during weight loss? And what do we have to eat and do for exercise to gain muscle weight and still lose fat? I ask these questions for those who have been told they are gaining muscle...I just think they should know since I am wrong according to the majority who answered my first question/answer...

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