Why do humans prefer the sweet tasting things over the other tastes such as salty and sour?

I'M NOT AN EXPERT BUT MAYBE THE REASON BEHIND THIS IS THE FIRST INTAKE OF A NEWLY BORN CHILD BEFORE HE OR SHE OPENED HIS OR HER EYES IN THIS WORLD THE INTRODUCTION TO HIS OR HER MOUTH IS SUGARBASED VITAMINS AND OR MEDICINE THRU A MEDICINE DROPPER AS ANTI-INFECTION, TETANOUS ETC. AS JUSTIFIED BY MEDICAL PRACTITIONERS. ALL I CAN SAY (IN MY OPINION) THAT ALL PEOPLE IN THIS WORLD ARE PRE-DIABETIC BECAUSE OF THE SWEET POISON HIDDEN ALL FOODS, DRINKS, VITAMINS ETC.