I don't think so. For instance, pro cyclist have been doing nothing but cycling training for years and years. And still, this effect shows up a few weeks into a Grand Tour.
As they mention at the end of the article, from gorging research (eating as much as possible to gain weight) it is also known that the body can't ingest more calories than about 2.5x times the normal daily energy output. So it's more likely that that is the limiting factor -- in the first weeks you have some reserves to burn, but when those are gone your body doesn't burn more energy than it can take in.
As they mention at the end of the article, from gorging research (eating as much as possible to gain weight) it is also known that the body can't ingest more calories than about 2.5x times the normal daily energy output. So it's more likely that that is the limiting factor -- in the first weeks you have some reserves to burn, but when those are gone your body doesn't burn more energy than it can take in.