You hate it on your thighs, but love it in ice cream. Once upon a time, fat was a good thing. A nice pad of fat around the middle helped early man get through the harsh winter when food was scarce. Fast forward to last weekend, and a predisposition to indulge in nachos, greasy hot wings and pork rinds may have some of you waddling the dog around the park instead of setting a brisk, heart-healthy pace. Fat is another food that affects the pleasure center of the brain. When coupled with salt or sugar (or both), it packs a double whammy that can be irresistible. The fast food industry excels at developing menu options that create the most addictive blends of fat, sugar and salt. Be afraid. Be very afraid.