I have no study or scientific proof of this. But during the growth of a young ball python, hatchling to 1000-1500 grams, I highly dought this has an effect on lifespan or overall health. I would say after 1500 grams is when you can make your snake "obese" im not saying a 2400g ball is obese, theres definitely a difference between 2400 grams of solid healthy snake and a 2400 gram fattie.

just my 2 cents