I don't really care who was claiming what.

Claims are not reality.

I've worked with a lot of people in my time and while it's true that people can add some muscle even in the face of a caloric deficit.... it's not something that should be expected.

People who will generally be able to lose fat and gain muscle concurrently are those carrying a lot of extra fat and/or those who are brand new to strength training.

But even in those instances, you aren't going to see an enormous gain in muscle while dieting. Adding new muscle is a very intensive process, energetically speaking. Calories are energy. If you are deficient in calories, how can you build a lot of muscle?

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