When I met Conor, he had been following strict Paleo for over a year. Not only was he eating clean, he was doing CrossFit 4+ times per week and hitting extra sessions in the gym for strength and cardio (and had been doing so for over 2 years). That's the picture on the left.
The picture on the right is after 9 months of dedication to counting macros. Not much has changed with his gym routine, but what he eats, how much he eats, and when he eats it has transformed his body.
He went from around 13% body fat to 5% body fat, has maintained muscle mass and lost approximately 20 lbs, with 16 lbs of that being pure fat loss.