[logicchains]

Muscle tissue burns 7-10 calories per pound per day. This means someone who gains 100 pounds of muscle (e.g. from 150 lbs untrained to a 250 lbs bodybuilder) would increase their metabolism by 700-1000 calories, almost a 50% increase in the average daily male calorie requirements of around 2000 calories.

[civilitty]

Putting on 100 lbs of muscle is impossible without steroids for 99% of people even with 10-15 years of constant training.

Estimates vary but 50 lbs of lean muscle mass is generally considered the natural maximum for men.

[glouwbug]

I think 100 was just a nice round number to make their point easier to read

[paulpauper]

even with steroids virtually impossible. the heaviest pro bodybuilders ever peak at around 270-290 lbs

[brigadier132]

Someone in their first year of consistent serious training can realistically put on 15 pounds of muscle. The year after that it drops to 5 pounds.

[blipvert]

That is an insane amount of training - big lifestyle changes!

I increased my calorific needs by 1000 a day by doing a 10K run (1hr) before breakfast.

Still a 160lb weakling :)

[nradov]

That seems high. Someone your weight would generally only burn about 750 kcal on that workout.

[alex-korr]

750 kcals is insanely high for a 10k training run. If you hold your HR to Z2, 620-640 kcals would be my ballpark expectation.

[blipvert]

It’s what Strava says I’m burning so I can only go by that. 750 would still be above the low end of the range quoted by the OP.

The amount of extra food I needed to start eating!

[nradov]

You shouldn't go by Strava numbers, they are known to overestimate.

[blipvert]

Fair enough but it’s still going to be at the low end of the range 700-1000 range given earlier for 100lbs of muscle gain.

I’m ~75kg. Schwarzenegger was ~120kg in his prime. 45kg difference is (2.2lbs to the kg) 100lbs (differences between UK and USA imperial notwithstanding).

The chances of me going from where I am to a AS physique is zero!

[sapiogram]

Do you have a source? I would expect the first pounds of muscle to affect metabolism more than the 100th pound, but that's my immediate intuituion.