It's true, it's a fairly rare tissue type in temperate climates, babies are born with a fair amount of it but usually lose it quite quickly as they never need it. Again, you grow it back just by being cold, when someone says they don't feel the cold, they probably just have more of that than average. Beige fat is kinda the middle ground, having it isn't perfect, but it's better than yellow fat. They're both referred to as cellulite so it's brown cellulite and yellow/white cellulite (depending on convention, both mean the same but yellow is used more).