A QUESTION FOR EVERYBODY

HI,
WHY IS IT THAT EXPERTS SAY "YOU HAVE TO EAT THE RIGHT AMONT OF CALORIES IN ORDER TO LOSE WEIGHT" (USUALLY MORE THAN ANY OF US WOULD THINK APPPROPRIATE ON A CALORIE CONTROLLED DIET) THEN THERE ARE THOSE WHO CAN LOSE WEIGHT BY NOT EATING VERY MUCH. WHICH IS WHY I THINK A LOT OF US THINK LESS MUST BE BETTER.

EXAMPLE : BETTE MIDLER RECENTLY LOST A BUNCH OF WEIGHT AS SHE LOST HER APPETITE FOR A FEW MONTHS AFTER EATING SOME BAD FISH. ?????