There’s nothing different in the biochemistry. The main reason is that they’re opposing goals. To lose weight you need a caloric deficit. To gain weight you need a surplus. Do you see how these are mutually exclusive goals?
It is possible but it’s more efficient to focus on one goal.
This is where I disagree. There must be SOMETHING chemically different, because I could grab a newb off the street, put him on a caloric deficient, have him strength train, and he’ll add muscle AND lose fat. Obviously if I grab Professor X over there and put him on the same sort of thing, he’ll probably only lose fat.
Now, is this only because of the shock of weight training? Is there an elevation of a particular fight or flight chemical that causes this? This is what I’m asking. Of course it’s best to choose one goal at a time (and in fact unless you’re a beginner you’re going to HAVE to choose one or the other…I’m asking why (chemically) this is.) [/quote]
Well we’re all still humans. We still have pretty similar DNA, so there’s nothing different biochemically. The difference is you have a trained individual who has already gained a lot of muscle and has the capacity to contract a lot of motor units at once, VS an untrained individual who has a lot more muscle to gain (as they won’t have much) and can’t contract a lot of motor units at once, so they’ll be able to handle more volume.
Basically the untrained guy is further down on the scale so he has more to gain. The trained guy has already achieved something and it is always harder to move upwards when you already are up there. Just ask any top 500 tennis player who wants to break into the top 100. MUCH harder than it was getting to the top 500.