BROWN FAT

 Everybody today is so weight-conscious, and so many people are on diets, that you could probably say fat is something nobody wants.

Yet fat, of course, is very necessary to the body. It accumulates in this way: At certain points, the connective-tissue cells become filled with fat. First, tiny droplets appear inside the cells. They increase in size, run together into a large drop, and finally fill the cell and swell it out like a balloon. Eventually, the cell is changed into a large drop of fat surrounded by a thin envelope of tissue.