Instant mashed potatoes are just as healthy as regular mashed potatoes made from cooked potatoes that you boil and mash.
Both instant mashed potatoes and regular mashed potatoes contain the same vitamins and nutrients so eating instant mashed potatoes is still healthy as well.
Instant mashed potatoes are still a good source of vitamin C and the B vitamins.
Instant mashed potatoes are just potatoes made from dehydrated cooked potatoes that you just mix with milk or water to create instant easy to make mashed potatoes.