Simplify the following text for a Grade 11 native English-speaking person.
Original: Medical science tells about two types of carbohydrates : simple carbohydrates , and complex carbohydrates .
Simplified: A commonly held belief , even among nutritionists , is that complex carbohydrates ( polysaccharides , e.g. starches ) are digested more slowly than simple carbohydrates ( sugars ) and thus are healthier .