There's a big difference between "well fed" and "properly fed." "Well fed," to me, usually means "gets enough, or more than enough, to eat." "Properly fed" means "gets the right amount of food, and sufficient quantities of most nutrients."

People don't often die of starvation in the United States. I don't have exact numbers, but if you exclude people who have eating disorders, I'm sure it's insignificant compared to almost every other cause of death. But, malnutrition is certainly a problem, and that problem gets worse when you have people who literally don't know where their next meal is coming from.