Also adipocytes shrink but they don't go away. They grow in number in the first year of life,at the early teen years and in the last 6 months of pregnancy (this is why women have to keep attention and don't overeat because pregnancy is not a fucking excuse god damn it). But they grow also if you go over 30 of BMI,so an obeast who lose weight remain with fat cells.  This is what I know,if someone know better is welcome.