diet and math bodyfat

[jdvert]

I had a conversation with a friend about equations and guessing about what time or how many weeks or months to get to certain bodyfat percentage. Do you think they are accurate in general.We goback and forth over diffrent concepts (metabolisms,drugs,etc) of the body but he insist thier accurate based on science regardless.I must say he has been spot on within a week or two on most people we know luck I guess.